ISO 286 1 Limites y Ajustes

INTERNATIONAL STANDARD

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXJJYHAPOAHAR OPTAHM3A~Mfl f-t0 CTAHflAPTM3A~MM

IS0 system of limits and fits -

Part I : Bases of tolerances, deviations and fits

Syst&me IS0 de tokkances et d’ajustements -

Partie 7 : Base des tokances, harts et ajustements

IS0 286-l First edition 1988-09-15

Reference number IS0 286-l : 1988 (E)

© ISO 2009 - This is a single-user license for personal use only.All other uses prohibited.

Foreword

IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (is0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting.

This part of IS0 286 has been prepared by ISO/TC 3, Limits and fits, and, together with IS0 286-2, completes the revision of ISO/R 286, /SO system of limits and fits. ISO/R 286 was first published in 1962 and subsequently confirmed in November 1964; it was based on ISA Bulletin 25 first published in 1940.

The major changes incorporated in this part of IS0 286 are as follows:

a) The presentation of the information has been modified so that IS0 286 can be used directly in both the design office and the workshop. This has been achieved by separating the material dealing with the bases of the system, and the calculated values of standard tolerances and fundamental deviations, from the tables giving specific limits of the most commonly used tolerances and deviations.

b) The new symbols js and JS replace the former symbols js and Js (i.e. s and S are no longer placed as subscripts) to facilitate the use of the symbols on equipment with limited character sets, e.g. computer graphics. The letters “s” and “S” stand for “symmetrical deviation”.

c) Standard tolerances and fundamental deviations have been included for basic sizes from 500 to 3 150 mm as standard requirements (these were previously included on an experimental basis only).

d) Two additional standard tolerance grades, IT17 and IT18, have been included.

e) Standard tolerance grades IT01 and IT0 have been deleted from the main body of this part of IS0 286, although information on these grades is given in annex A for users who may have a requirement for such grades.

f) Inch values have been deleted.

9) The principles, terminology bY contemporary technology.

and symbols aligned required

Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.

0 International Organization for Standardization, 1988 0

Printed in Switzerland

ii


ISO286-1:1988 EI

Contents

6

7

8

9

IO

Introduction. ....................................................... 1

Scope ............................................................. 1

Field of application .................................................. 1

References ......................................................... 1

Terms and definitions ................................................ 2

Symbols, designation and interpretation of tolerances, deviations andfits.. .......................................................... 6

Graphical representation ............................................. 9

Reference temperature ............................................... 10

Standard tolerances for basic sizes up to 3 150 mm. ...................... 10

Fundamental deviations for basic sizes up to 3 150 mm ................... 10

Bibliography ........................................................ 16

Annexes

A Bases of the IS0 system of limits and fits ............................... 17

B Examples of the use of IS0 286-l ....................................... 23

C Equivalentterms .................................................... 24

. . . III


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INTERNATIONAL STANDARD IS02864 : 1988 (E)

IS0 system of limits and fits -

Part 1: Bases of tolerances, deviations and fits

0 Introduction

The need for limits and fits for machined workpieces was brought about mainly by the inherent inaccuracy of manufacturing methods, coupled with the fact that “exactness” of size was found to be unnecessary for most workpieces. In order that function could be satisfied, it was found sufficient to manufacture a given workpiece so that its size lay within two permissible limits, i.e. a tolerance, this being the variation in size acceptable in manufacture.

Similarly, where a specific fit condition is required between mating workpieces, it is necessary to ascribe an allowance, either positive or negative, to the basic size to achieve the required clearance or interference, i.e. a “deviation”.

With developments in industry and international trade, it became necessary to develop formal systems of limits and fits, firstly at the industrial level, then at the national level and later at the international level.

This International Standard therefore gives the internationally accepted system of limits and fits.

Annexes A and B give the basic formulae and rules necessary for establishing the system, and examples in the use of the standard are to be regarded as an integral part of the standard.

Annex C gives a list of equivalent terms used in IS0 286 and other International Standards on tolerances.

1 Scope

This part of IS0 286 gives the bases of the IS0 system of limits and fits together with the calculated values of the standard tolerances and fundamental deviations. These values shall be taken as authoritative for the application of the system (see also clause A. 1).

This part of IS0 286 also gives terms and definitions together with associated symbols.

2 Field of application

The IS0 system of limits and fits provides a system of tolerances and deviations suitable for plain workpieces.’

For simplicity and also because of the importance of cylindrical workpieces of circular section, only these are referred to ex- plicitly. It should be clearly understood, however, that the tolerances and deviations given in this International Standard equally apply to workpieces of other than circular section.

In particular, the general term “hole” or “shaft” can be taken as referring to the space contained by (or containing) the two parallel faces (or tangent planes) of any workpiece, such as the width of a slot or the thickness of a -key.

The system also provides for fits between mating cylindrical features or fits between workpieces having features with parallel faces, such as the fit between a key and keyway, etc.

NOTE - It should be noted that the system is not intended to provide fits for workpieces with features having other than simple geometric forms.

For the purposes of this part of IS0 286, a simple geometric form consists of a cylindrical surface area or two parallel planes.

3 References

NOTE - See also clause 10.

IS0 1, Standard reference temperature for industrial length measurements.

IS0 286-2, IS0 system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts.

IS01 R 1938, IS0 system of limits and fits - Inspection of plain workpieces. 1 )

IS0 8015, Technical drawings - Fundamental tolerancing principle.

1) At present under revision.

1


Is0 286-1 : 1988 E)

4 Terms and definitions

For the purposes of this International Standard, the following terms and definitions apply. It should be noted, however, that some of the terms are defined in a more restricted sense than in common usage.

4.1 shaft: A term used, according to convention, to describe an external feature of a workpiece, including features which are not cylindrical (see also clause 2).

4.1.1 basic shaft: Shaft chosen as a basis for a shaft-basis system of fits (see also 4.11.1).

For the purposes of the IS0 system of limits and fits, a shaft the upper deviation of which is zero.

4.2 hole : A term used, according to convention, to describe an internal feature of a workpiece, including features which are not cylindrical (see also clause 2).

4.2.1 basic hole: Hole chosen as a basis for a hole-basis system of fits (see also 4.11.2).

For the purposes of the IS0 system lower deviation of which is zero.

of limits and fits, a hole the

4.5 zero line: In a graphical representation of limits and fits, the straight line, representing the basic size, to which the deviations and tolerances are referred (see figure 7).

According to conventio n, the zero line is with positive deviations shown above and below (see figure 2).

Zero line (4.5)

ti

zf

:

w .- cn 0 .a 8

M

4.3 size : A number expressing, in numerical value of a linear dimension.

a particular unit, the Figure 1 - Basic

4.3.1 basic size; nominal size: The size from which the limits of size are derived by the application of the upper and lower deviations (see figure 1).

NOTE - e.g. 32;

The basic size 15; 8,75; 0,5;

can be a etc.

or a number,

4.3.2 actual size: The size of a feature, obtained by measurement.

4.3.2.1 actual local size: Any individual distance at any cross-section of a feature, i.e. any size measured between any two opposite points.

4.3.3 limits of size: The two extreme permissible sizes of a feature, between which the actual size should lie, the limits of size being included.

4.3.3.1 maximum limit of size: The greatest permissible size of a feature (see figure 1).

4.3.3.2 minimum limit of size : The smallest permissible size of a feature (see figure 1).

4.4 limit deviations.

system: A system of standardized tolerances and

Es

drawn horizontally, negative deviations

size, and maxim limits of size

urn and minimum

4.6 deviation: The algebraic difference between a size (actual size, limit of size, etc.) and the corresponding basic size.

NOTE - Symbols for shaft deviations are lower case letters (es, ei) and symbols for hole deviations are upper case letters (Es, EI) (see figure 2).

4.6.1 limit deviations : Upper deviation and lower deviation.

4.6.1.1 upper deviation (ES, es) : The algebraic difference between the maximum limit of size and the corresponding basic size (see figure 2).

4.6.1.2 lower deviation (EL ei) : The algebraic difference between the minimum limit of size and the corresponding basic size (see figure 2).

4.6.2 fundamental deviation: For the purposes of the IS0 system of limits and fits, that deviation which defines the position of the tolerance zone in relation to the zero line (see figure 2).

NOTE - This may be either the upper or lower deviation, but, according to convention, the fundamental deviation is the one nearest the zero line.

4.7 size tolerance: The difference between the maximum limit of size and the minimum limit of size, i.e. the difference between the upper deviation and the lower deviation.

NOTE - The tolerance is an absolute value without sign.

2


IS0 286-l I 1988 E)

+

5 P 0

l -

z

0

I

.-

2

n

-

- Lower deviation (EI, ei 1 (4.6.1.2)

Tolerance zone (4.7.3)

tolerance (4.7)

Zero line (4.5) A

T - (ES, es)

(4.6.1.1) ,~ w

- F- ti s 8 .- cn 0 .- Ei m

Figure 2 - Conventional representation of a tolerance zone

4.7.1 standard tolerance (IT) : For the purposes of the IS0 system of limits and fits, any tolerance belonging to this system.

NOTE - The letters of the symbol IT stand for “International Tolerance” grade.

4.7.2 standard tolerance grades: For the purposes of the IS0 system of limits and fits, a group of tolerances (e.g. IJ7), considered as corresponding to the same level of accuracy for all basic sizes.

4.7.3 tolerance zone : In a graphical representation of tolerances, the zone, contained between two lines representing the maximum and minimum limits of size, defined by the magnitude of the tolerance and its position relative to the zero line (see figure 2).

4.7.4 tolerance class: The term used for a combination of fundamental deviation and a tolerance grade, e.g. h9, D13, etc.

4.7.5 standard tolerance factor (i, I): For the purposes of the IS0 system of limits and fits, a factor which is a function of the basic size, and which is used as a basis for the determi- nation of the standard tolerances of the system.

NOTES

1 The standard tolerance factor i is applied to basic sizes less than or equal to 500 mm.

2 The standard tolerance factor I is applied to basic sizes greater than 500 mm.

4.8 clearance: The positive difference between the sizes of the hole and the shaft, before assembly, when the diameter of the shaft is smaller than the diameter of the hole (see figure 3).

r Clearance (4.8)

Figure 3 - Clearance

4.8.1 minimum clearance: In a clearance fit, the positive difference between the minimum limit of size of the hole and the maximum limit of size of the shaft (see figure 4).

4.8.2 maximum clearance: In a clearance or transition fit, the positive difference between the maximum limit of size of the hole and the minimum limit of size of the shaft (see figures 4 and 5).

4.9 interference : The negative difference between the sizes of the hole and the shaft, before assembly, when the diameter of the shaft is larger than the diameter of the hole (see figure 6).

4.9.1 minimum interference: In an interference fit, the negative difference, before assembly, between the maximum limit of size of the hole and the minimum limit of size of the shaft (see figure 7).

.

A- C- 4 s

ti ii 5 a

z E

i .- .- ;

1

I ci 06 5

Figure 4 - Clearance fit

3 © ISO 2009 - This is a single-user license for personal use only.All other uses prohibited.

IS0 286-1 : 1988 (E)

Maximum

r clearance (4.8.2) 1

Maximum

Maximum Minimum interference ‘-1 I- interference

interference 2 (4.9.2)

Figure 5 - Transition fit

Interference

Figure 6 - Interference

Figure 7 - Interference fit

(4.9)

4.9.2 maximum interference: In an interference or transition fit, the negative difference, before assembly, between the minimum limit of size of the hole and the maximum limit of size of the shaft (see figures 5 and 7).

4.10 fit: The relationship resulting from the difference, before assembly, between the sizes of the two features (the hole and the shaft) which are to be assembled.

4.10.1 clearance fit: A fit that always provides a clearance between the hole and shaft when assembled, i.e. the minimum size of the hole is either greater than or, in the extreme case, equal to the maximum size of the shaft (see figure 8).

Hole Hole

Shaft

Shaft

Figure 8 - Schematic representation of clearance fits

4.10.2 interference fit: A fit which everywhere provides an interference between the hole and shaft when assembled, i.e. the maximum size of the hole is either smaller than or, in the extreme case, equal to the minimum size of the shaft (see figure 9).

Shaft

Hole

Shaft

t Hole

Zero line .

NOTE - The two mating parts of a fit have a common basic size. Figure 9 - Schematic representation of interference fits

4


IS0 286-l : 1988 (El

4.103 transition fit: A fit which may provide either a clearance or an interference between the hole and shaft when assembled, depending on the actual sizes of the hole and shaft, i.e. the tolerance zones of the hole and the shaft overlap com- pletely or in part (see figure IO).

. . . Shaft Hole

Zero line ,

Figure 10 - Schematic representation of transition fits

4.10.4 variation of a fit: The arithmetic sum of the tolerances of the two features comprising the fit.

NOTE - The variation of a fit is an absolute value without sign.

4.11 fit system : A system of fits comprising shafts and holes belonging to a limit system.

4.11.1 shaft-basis system of fits: A system of fits in which the required clearances or interferences are obtained by associating holes of various tolerance classes with shafts of a single tolerance class.

For the purposes of the IS0 system of limits and fits, a system of fits in which the maximum limit of size of the shaft is identical to the basic size, i.e. the upper deviation is zero (see figure I I).

Shaft “h”

L Basic size (4.3.1)

NOTES

1 The horizontal continuous lines represent the fundamental deviations for holes or shafts.

2 The dashed lines represent the other limits and show the possibility of different combinations between holes and shafts, related to their grade of tolerance (e.g. G71h4, H6/h4, M5/h4).

4.11.2 hole-basis. system of fits : A system of fits in which the required clearances or interferences are. obtained by associating shafts of various tolerance classes with holes of a single tolerance class.

For the purposes of the IS0 system of limits and fits, a system of fits in which the minimum limit of size of the hole is identical to the basic size, i.e. the lower deviation is zero (see figure 12).

- Basic size (4.3.1)

NOTES

1 The horizontal continuous lines represent the fundamental deviations for holes or shafts.

2 The dashed lines represent the other limits and show the possibility of different combinations between holes and shafts, related to their grade of tolerance (e.g. H6/ h6, H6/js5, H6/p4).

Figure 12 - Hole-basis system of fits

4.12 maximum material limit (MML): The designation applied to that of the two limits of size which corresponds to the maximum material size for the feature, i.e.

- the maximum (upper) limit of size for an external feature (shaft),

- the minimum (lower) limit of size for an internal feature (hole).

NOTE - Previously called “GO limit”.

4.13 least material limit (LMLI : The designation applied to that of the two limits of size which corresponds to the minimum material size for the feature, i.e.

- the minimum (lower) limit of size for an external feature (shaft),

- the maximum (upper) limit of size for an internal feature (hole).

Figure 11 - Shaft-basis system of fits NOTE - Previously called “NOT GO limit”.


IS0 286-1 : 1988 (E)

Examples : 5 Symbols, designation and interpretation of tolerances, deviations and fits

5.1 Symbols

5.1 .l Standard tolerance grades

The standard tolerance grades are designated by the letters IT followed by a number, e.g. IJ7. When the tolerance grade is associated with (a) letter(s) representing a fundamental deviation to form a tolerance class, the letters IT are omitted, e.g. h7.

NOTE - The IS0 system provides for a total of 20 standard tolerance grades of which grades IT1 to IT18 are in general use and are given in the main body of the standard. Grades IT0 and ITOl, which are not in general use, are given in annex A for information purposes.

32H7 8OjsI5 10096

-0 012 IO0 -0:034

ATTENTION - In order to distinguish between holes and shafts when transmitting information on equipment with limited character sets, such as telex, the designation shall be prefixed by the following letters:

- H or h for holes;

- S or s for shafts.

Examples :

5OH5 becomes H5OH5 or h5Oh5 5Oh6 becomes S5OH6 or s5Oh6

5.1.2 Deviations

5.1.2.1 Position of tolerance zone

This method drawings.

of designation shall not be on

The position of the tolerance zone with respect to the zero line, which is a function of the basic size, is designated by (an) upper case letter(s) for holes (A . . . ZC) or (a) lower case letter(s) for shafts (a . . . zc) (see figures I3 and 14).

5.2.3 Fit

A fit requirement between mating features shall be designated bY

NOTE - To avoid confusion, the following letters are not used : a) the common basic size;

I, i; L, I; 0, 0; Q, q; W, w. b) the tolerance class symbol for the hole;

5.1.2.2 Upper deviations c) the tolerance class symbol for the shaft.

Examples : The upper deviations are designated by the letters “ES” for holes and the letters “es” for shafts.

Ii7 52H7lg6 or 52 -

96

5.1.2.3 Lower deviations

The lower deviations are designated by the letters “El” for holes and the letters “ei” for shafts.

ATTENTION - In order to distinguish between the hole and the shaft when transmitting information on equipment with limited character sets, such as telex, the designation shall be prefixed by the following letters:

5.2 Designation - H or h for holes;

- S or s for shafts;

5.2.1 Tolerance class - and the basic size repeated.

A tolerance class shall be designated by the letter(s) representing the fundamental deviation followed by the number representing the standard tolerance grade.

Examples :

52H7/g6 becomes H52H7/S52G6 or h52h7/s52g6

Examples : This method of designation shall not be used on drawings.

H7 (holes) h7 (shafts) 5.3 Interpretation of a toleranced size

5.2.2 Toleranced size 5.3.1 Tolerance indication in accordance with IS0 8015

A toleranced size shall be designated by the basic size followed by the designation of the required tolerance class, or the ex- plicit deviations.

The tolerances for workpieces manufactured to drawings marked with the notation, Tolerancing IS0 8015, shall be interpreted as indicated in 5.3. I. I and 5.3.1.2.


Is0 286-I : 1988 (El

2 0 .- z .- $ u 5 E E 3 z

NOTES

a) Holes (internal features)

b) Shafts (external features)

I According to convention, the fundamental deviation is the one defining the nearest limit to the zero line.

2 For details concerning fundamental deviations for J/j, K/k, M/m and N/n, see figure 14.

Figure 13 - Schematic representation of the positions of fundamental deviations


60286-1:1988 E) I

U N 0

CL

P

t 0

a

1

is

. . CL) l- 0 z

L

t 0

I-- l- --

. . LLJ l- 0 z


IS0 286-k 1988 a(E)

53.1 .I Linear size tolerances

A linear size tolerance controls only the actual local sizes (two- point measurements) of a feature, but not its form deviations (for example circularity and straightness deviations of a cylindrical feature or flatness deviations of parallel surfaces). There is no control of the geometrical interrelationship of individual features by the size tolerances. (For further information, see ISO/R 1938 and IS0 8015.)

5.3.1.2 Envelope requirement

Single features, whether a cylinder, or established by two parallel planes, having the function of a fit between mating parts, are indicated on the drawing by the symbol @ in addition to the dimension and tolerance. This indicates a mutual dependence of size and form which requires that the envelope of perfect form for the feature at maximum material size shall not be violated. (For further information, see ISO/R 1938 and IS0 8015.)

NOTE - Some national standards (which should be referred to on the drawing) specify that the envelope requirement for single features is the norm and therefore this is not indicated separately on the drawing.

53.2 Tolerance indication not in accordance with IS0 6015

The tolerances for workpieces manufactured to drawings which do not have the notation, Tolerancing IS0 6015, shall be interpreted in the following ways within the stipulated length :

a) For holes

The diameter of the largest perfect imaginary cylinder, which can be inscribed within the hole so that it just contacts the highest points of the surface, should not be smaller than the maximum material limit of size. The maximum diameter at any position in the hole shall not exceed the least material limit of size.

b) For shafts

The diameter of the smallest perfect imaginary cylinder, which can be circumscribed about the shaft so that it just contacts the highest points of the surface, should not be larger than the maximum material limit of size. The minimum diameter at any position on the shaft shall be not less than the least material limit of size.

The interpretations given in a) and b) mean that if a workpiece is everywhere at its maximum material limit, that workpiece should be perfectly round and straight, i.e. a perfect cylinder.

Unless otherwise specified, and subject to the above requirements, departures from a perfect cylinder may reach the full value of the diameter tolerance specified. For further information, see ISO/R 1938.

NOTE - In special cases, the maximum form deviations permitted by the interpretations given in a) and b) may be too large to allow satisfac- tory functioning of the assembled parts: in such cases, separate tolerances should be given for the form, e.g. separate tolerances on circularity and/or straightness (see IS0 1101).

6 Graphical representation

The major terms and definitions given in clause 4 are illustrated in figure 15.

In practice, a schematic diagram such as that shown in figure 16 is used for simplicity. In this diagram, the axis of the workpiece, which is not shown in the figure, according to convention always lies below the diagram.

In the example illustrated, the two deviations positive and those of the shaft are negative.

of the hole are

K zi 8 r Upper deviation (4.6.1.1) -

r Lower deviation (4.6.1.2)

Hole (4.2) 1

Minimum limit of size (4.3.3.2) -

Maximum limit of size (4.3.3.1)

Basic size (4.3.1) A

Figure 15 - Graphical representation

+ 5 ii 0 .- % O- .- 2 n

-

Hole

Shaft

Figure 16 - Simplified schematic diagram


IS0 286-l : 1988 (El

7 Reference temperature

The temperature at which the dimensions of the IS0 system of limits and fits are specified is 20 OC (see IS0 I).

8 Standard tolerances for basic sizes up to 315Omm

8.1 Basis of the system

The bases for calculating the standard tolerances are given in annex A.

8.2 Values of standard tolerance grades (IT)

Values of standard tolerance grades IT1 to IT18 inclusive are given in table 1. These values are to be taken as authoritative for the application of the system.

NOTE - Values for standard tolerance grades IT0 and IT01 are given in annex A.

9 Fundamental deviations for basic sizes up to315Omm

9.1 Fundamental deviations for shafts [except deviation js (see 9.3)]

The fundamental deviations for shafts and their respective sign ( + or - 1 are shown in figure 17. Values for the fundamental deviations are given in table 2.

The upper deviation (es) and lower deviation (ei) are established from the fundamental deviation and the standard tolerance grade (IT) as shown in figure 17.

Deviations a to h

Zero line

es = negative ( - 1 fundamental deviation

ei = es - IT

Deviations k to zc

ei = positive ( + ) fundamental deviation

es = ei + IT

Figure 17 - Deviations for shafts

9.2 Fundamental deviations for holes [except deviation JS (see 9.311

The fundamental deviations for holes and their respective sign ( + or - ) are shown in figure 18. Values for the fundamental deviations are given in table 3.

The upper deviation (ES) and lower deviation (H) are established from the fundamental deviation and the standard tolerance grade (IT) as shown in figure 18.

Deviations A to H

EI = positive (+ 1 fundamental deviation

ES = EI + IT

Deviations K to ZC (not valid for tolerance grades

less than or equal to IT8 of deviation K and tolerance

class M8)

Zero line

ES = negative ( - 1 fundamental deviation

EI = ES - IT

Figure 18 - Deviations for holes

9.3 Fundamental deviations js and JS (see figure 19)

The information given in 9.1 and 9.2 does not apply to fundamental deviations js and JS, which are a symmetrical distribution of the standard tolerance grade about the zero line, i.e. for js:

IT es = ei = - 2

and for JS: IT

ES = EI.= - 2

es IT

r2 r ES

h w

El .

Shaft I Hole

L IT 2

Figure 19 - Deviations js and JS


IS0 286-1 : 1988 (EI

9.4 Fundamental deviations j and J

The information given in 9.1 to 9.3 does not apply to fundamental deviations j and J, which are, for the most part, asymmetrical distributions of the standard tolerance grade about the zero line (see IS0 286-2, tables 8 and 24).

Table 1 - Numerical values of standard tolerance grades IT for basic sizes up to 3 150 mm ‘)

Basic size Standard tolerance grades

mm IT7 IT8 1 IT8 1 IT10 ] IT11 1 IT12 1 IT13 1 lTl43)1 IT153) 1 IT1631 ITl73)I IT1831 I up to Tolerances

Above and including IJm mm

- 33) 0,8 I,2 2 3 4 6 10 14 25 40 60 0,l 0,14 0,25 0,4 0,6 1 114 3 6 1 1,5 2,5 4 5 8 12 18 30 48 75 0,12 0,18 0,3 0,48 0,75 1,2 I,8

6 10 1 I,5 2,5 4 6 9 15 22 36 58 90 0,15 0,22 0,36 0,58 0;9 I,5 2,2 10 18 I,2 2 3 5 8 11 18 27 43 70 110 0,18 0,27 0,43 0,7 1,1' I,8 2,7

18 30 I,5 2,5 4 6 9 13 21 33 52 84 130 0,21 0,33 0,52 0,84 I,3 2,l 3,3

30 50 I,5 2,5 4 7 11 16 25 39 62 100 160 0,25 0,39 0,62 1 1,6 2,5 3,9

50 80 2,, 3 5 8 13 19 30 46 74 120 190 0,3 0,46 0,74 1,2 I,9 3 4,6

80 120 2,5 4 6 10 15 22 35 54 87 140 220 0,35 0,54 0,87 I,4 2,2 3,5 5,4-

120 180 3,5 5 8 12 18 25 40 63 100 160 250 0,4 0,63 1 I,6 2,5 4 613 180 250 4,5 7 10 14 20 29 46 72 115 185 290 0,46 0,72 I,15 1,85 2,9 4,6 7,2

250 315 6 8 12 16 23 32 52 81 130 210 320 0,52 0,81 I,3 2,l 3,2 5,2 8,l

315 400 7 9 13 18 25 36 57 89 140 230 360 0,57 0,89 I,4 2,3 3,6 5,7 8,9

d-00 500 8 10 15 20 27 40 63 97 155 250 400 0,63 0,97 1,55 2,5 4 6,3 9,7 ; 500 6302) 9 11 16 22 32 44 70 110 175' 280 440 0,7 I,1 I,75 2,8 4,4 7 11

630 8002) 10 13 18 25 36 50 80 125 200 320 500 0,8 I,25 2 3,2 5 8 12,5

800 10002) 11 15 21 28 40 56 90 140 230 360 560 0,9 I,4 2,3 3,6 5,6 9 14

1000 12502) 13 18 24 33 47 66 105 165 260 420 660 I,05 I,65 2,6 4,2 6,6 IO,5 16,5

1250 16002) 15 21 29 39 55 78 125 195 310 500 780 I,25 I,95 3,l 5 718 12,5 19,5

1600 20002) 18 25 35 46 65 ,92 150 230 370 600 920 I,5 2,3 3,7 6 9,2 15 23

2000 25002) 22 30 41 55 78 110 175 280 440 700 1100 1,75 2,8 4,4 7 11 17,5 28

2500 31502) 26 36 50 68 96 135 210 330 540 860 1350 2,l 3,3 5,4 86 13,5 21 33 - 1) Values for standard tolerance grades IT01 and IT0 for basic sizes less than or equal to 500 mm are given in annex A, table 5.

2) Values for standard tolerance grades IT1 to IT5 (incl.) for basic sizes over 500 mm are included for experimental use.

3) Standard tolerance grades IT14to IT18 (incl.) shall not be used for basic sizeslessthan or equal to 1 mm.


IS0 286-l : 1988 E)

Table 2 - Numerical values of the

Fundamental Basic size

I Upper deviation es mm -T- IT7 IT8

IT5 and IT6

All standard tolerance grades

t al) 1 bl) 1 c 1 cd d e ef h T i - 2701 -140 1 - 60 1 -34 - 20 - 270 1 -140 I - 70 I -46

61 IO - 2801 -150 I - 80 I -56 - 30

-40

+-I-+ - 25 -18

- 2901 -150 1 - 95 1 -50 - 32

f

- 6

- 10

- 13

- 16 I I I

I . I I

I I

+-+-I- 3001 -160 I -110 I - 65 -40

30 40 - 310 -170 -120 40 50 - 320 -180 -130

50 65 - 340 -190 -140

-80 -50 - 25

65 I 80 I- 3601 -200 I -150 I -100 -60

80 I loo I- 3801 -220 I -170 I 100 I 120 I- 414 -240 I -180 I -120 - 72 - 36

120 I 140 I -7i6-l -260 I -200 I ~~

140 I 160 I- 520 1 -280 1 -210 1 -145 - 85 -43 160 180 - 580 -310 - 230

180 200 -660-340 -240

200 I 225 I- 7401 -380 I -260 I -170

225 I 250 I- 827 -420 1 -280 1

250 I 280 I-zzl -480 I -300 I 280 I 315 I-105oL5401~3301 -190 -110

315 355 -1200 -600 -360

355 400 -1350 -680 -400

400 450 -1500 -760 -440

450 500 -1650 -840 -480

500 560

560 630

-210 -125 - 62

- 230 -135 -68

-260 -145 - 76

630 710

710 800

800 900

900 1000

- 290 -160 -80 -24

- 320 -170 - 86 I -26

1000 I 1120 I I I I 1 120 1 250

1250 1400

1400 1600

1600 1800

1800 2000

-350 -195

-220

- 98 1 -28

-390

-430 -240

2000 2240

2240 2500 -480 -260

2500 2800

2800 3 150 - 520 - 290

-32

c -34

-4 -6

-6

-8

-15

-18

-21

-16 -26

-18 -28

-20 -32 0

1) Fundamental deviations a and b shall not be used for basic sizes less than or equal to 1 mm.

2) For tolerance classes js7 to jsll, if the IT value number, n, is an odd number, this may be rounded to the even number immediately below, so that the ITn resulting deviations, i.e. + - , 2

can be expressed in whole micrometres.


IS0 286-1 : 1988 E)

fundamental deviations of shafts

Fundamental deviation values in micrometres

deviation values

Lower deviation ei

IT4 Up to IT3 to (incl.) and IT7 above IT7

All standard tolerarke grades

n P r S t U V. X Y Z za _ zb zc

+ 4 + 6 +I0 + 14 + 18 + 20 + 26 + 32 + 40 + 60

+ 8 + 12 + 15 + 19 + 23 + 28 + 35 + 42 + 50 + 80

+ 10 + 15 + 19 + 23 + 28 +34 + 42 + 52 + 67 + 97

+40 + 50 + 64 + 90 + 130 + 12 + 18 + 23 + 28 + 33

+ 39 + 45 + 60 + 77 + 108 + 150

+ 41 +47 +54 + 63 + 73 + 98 + 136 + 188 +I5 +22 +28 + 357

+ 41 + 48 +55 +64 + 75 + 88 + 118 + 160 + 218

+ 48 + 60 -1-68 +80 + 94 + 112 + 148 + 200 + 274 +17 +26 +34 + 43

+ 54 + 70 + 81 + 97 + 114 + 136 + 180 + 242 + 325

+41 + 53+66+ 87 +102 +122 + 144 + 172 + 226 + 300 + 405 + 20 + 32

+43 + 59 + 75 + 102 +I20 +I46 + 174 + 210 + 274 + 360 + 480

+51 + 71 + 91 + 124 +I46 +I78 + 214 + 258 + 335 + 445 + 585 + 23 + 37

+54 + 79 + 104 + 144 +I72 +210 + 254 + 310 + 400 + 525 + 690

+63 + 92 + 122 + 170 +202 +248 1 + 300 + 365 + 470 + 620 + 800

+ 27 + 43 + 65 + 100 + 134 + 190 +228 +280 + 340 + 415 + 535 + 700 + 900

+ 68 + 108 + 146 + 210 +252 +310 + 380 + 465 + 600 + 780 +I 000

+ 77 + 122 + 166 + 236 +284 +350 + 425 + 520 + 670 + 880 +1150

+ 31 + 50 + 80 + 130 + 180 + 258 +310 +385 + 470 + 575 + 740 + 960 +I 250

+ 84 + 140 + 196 + 284 +340 +425 + 520 + 640 + 820 +I 050 +l 350

+ 94 + 158 + 218 + 315 +385 +475 + 580 + 710 + 920 +l 200 +I 550 + 34 + 56

+ 98 + 170 + 240 + 350 +425 +525 + 650 ‘+ 790 +I000 +I300 +I700

+I08 + 190 + 268 + 390 +475 +590 + 730 + 9o(l +I‘150 +I 500 +I 900 + 37 + 62 r

+114 + 208 + 294 + 435 +530 +660 + 820 +I000 +I300 +I650 +2100

+126 + 232 + 330 + 490 +595 +740 + 920 +I100 +1450 +I850 +2400 +40 +68,

+I32 + 252 + 360 + 540 +660 +820 +I000 +1250 +1600 +2100 +2600

+I50 + 280 + 400 + 600 +44 -1-78

+I55 + 310 + 450 + 660

+I75 + 340 + 500 + 740 +50 +88

+I85 + 380 + 560 + 840

+210 + 430 + 620 + 940 +56 +lcw

+220 + 470 + 680 +l 050

+250 + 520 + 780 +I 150 + 66 +I20

+260 + 580 + 840 +I300

+300 + 640 + 960 +I450 +78 +140-

+330 + 720 +I050 +I600

+370 + 820 +1200 +I850 + 92 +I70

+400 + 920 +I350 +2000

+440 +I000 +I500 +2300 +I10 +I95

+460 +I100 +I650 +2500

+550 +I250 +I900 +2900 +I35 +240 '

+580 +I400 +2100 +3200

t k

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

m

0 +2

+4

+6

+7

+8

+9

+I1

+13

+I5

-+-I7

+20

+21

+23

0 +26

0 +30

+34

+40

+48

+58

+68

+76

0

13


Is0 286-l : 1988 E)

. Table 3 - Numerical values of the

Basic size

mm

1 Upto

Lower deviation EI

All standard tolerance grades

Icluding( ~1) 1~1) I c ICDI D I E IEFI F IFGIG /HI JS2)

- 3'15) + 270 +140 + 60 +34 + 20 + 14 +lO + 6 +4 + 2 0

3 6 + 270 +140 + 70 +46 + 30 + 20 +'4 + '0 +6 + 4 0

6 10 + 280 +'w + 80 +56 + 40 + 25 +18 + '3 +8 + 5 0

10 14 .+ 290 +150 +95 +50 +32 + 16 +60

14 18

18 24 + 300 +160 +llO +65 +40 +20 +7 0

24 30

30 40 + 310 +170 +120 +80 +50

-- - -

40 50 + 320 +180 +130 I + 25 I I’ gl”l 50 65 + 340 +190 +140

65 80 + 360 +200 +150

80 100 + 380 +220 +170 +120 + 72 +36 +12 0

100 120 + 410 +240 +180

120 140 + 460 +260 +200

140 160 + 520 +280 +210 +145 +85 +43 +14 0

160 180 + 580 +310 +230

180 200 + 660 +340 +240

200 225 + 740 +380 +260 +170 +lOO +50 +15 0

225 250 + 820 +420 +280

250 280 + 920 +480 +300 +190 +llO -- _- -

280 315 +1050 +540 +330 I’“1 I”‘1 o I 315 355 +1200 +600 +360 +210 +125 + 62 0 355 400 +1350 +680 +400

1 1 1 1 / 1+181 1

400 450 +1500 +760 +440

450 500 +1650 +84O +480 /+23OI+l35I ' . M' '-nA'A' I’“1 I’“1 “I

500 560 +260 +145 I I

. + -A /D I 560 630 I 1 ,,ILl I’“1 “I I

630 710 +290 +160 +80 +24 0

710 800

800 900 +320 +170 +86 +26 0

900 1000

f+ii+s-l I I I l+3501+‘g51 I+981 I+28101 l+mlol

1250 1400 +390 +220

I - _- I l--l-l 1400 1600 I +-l-lo I 1600 1800

+430 +240 +120 +32 0 1800 2000

2000 2240 +480 +260 +130 +34 0

2240 2500

2500 2800 +520 +290 I

A m- +1+3 I

a- a

I 2800 13150 I I I I I I

Fundamental deviation

up to IT6 IT7 IT8 IT8 Above ulFio Above

(incl.) IT8 (incl. 1 IT8

J KS) M3)4)

+2+4+6 0 0 l-2 I-21 I I + 5 + 6 +lO -'+A l-4+41 -4 1

+ 5 + 8 +12 -‘+A -6+A -6

+ 6 +lO +15 -‘+A -7+-A -7

+ 8 +12 +20 -2+A -8+A -8

+lO +14 +24 -2+A -9+A -9

+13 +18 +28 -2+A -11 +A -11

+16 +22 +34 -3+A -13+A -13

I I I I I I I +18 +26 +41 1 1 I-3+4 1 l-15+41 -15 1

+22 +30 -1-47 -4+A

+25 +36 +55 -4+A

+29 +39 +60 -4+A

+33 +43 +66 -5+A

-17+A -17

-rn+A -20

-21 +A -21

-23+A -23 I

0 -26

0 -30

I II01 I I loI

0 -48

0 -58

I I loI -68

0 -76

1) Fundamental deviations A and B shall not be used for basic sizes less than or equal to 1 mm.

2) For tolerance classes JS7 to JSll, if the IT value number, n, is an odd number, this may be rounded to the even number immediately below, so that the ITn

resulting deviations, i.e. + -, 2

can be expressed in whole micrometres.

3) For determining the values K, M and N for standard tolerance grades up to IT8 (incl.) and deviations P to ZC for standard tolerance grades up to IT7 (incl.), take the d values from the columns on the right.

14


ISO286-1 :1988 E)

fundamental deviations of holes

Fundamental deviation values in micrometres

values

Upper deviation ES I Values for A

u/Go (incl.)

Standard tolerance grades above IT7 I

Standard tolerance grades

I N3)5) PtoZC31 lulvlx VI Z 1 ZA 1 ZB 1 ZC IT3 IT6 IT7 IT4

0

',5

1,5

IT5

0

1

2 6

ITE -

0

6 -7

9

8

6 16

4 6 7 15 23

4 6 9 17 26

m

, - 6 - 10 - 14 - 18 -20 - 26- 32- 40- 600 - 12 - 15 - 19 - 23 -28 - 35- 42- 50- 801

- 15 -19 - 23 - 28 -34 - 42 - 52 67 97 1 - -

- 18 -40 - 50 - 64 - 90 - 130

- 23 - 28 - 33 -39

1 -45 - 60- 77-108-150

- -22 -28 35. 41 -47 -54 - 63 - 73 - 98 136 188 - - -

- 41 ',5 - 48 - 55 - 64 - 75 - 88 - 118 160 218 - - - 48 - 60 - 68 - 80 - 94 - 112 - -26 -34 43.r 148 200 274 - - -

- 54 - 70 -81 - 97 - 114 - 136 - 180 242 325 ',5

- -

- 32 - 4' - 53 - 66 - 87 -102 -122 - 144 - 172 - 226 300 405 - - - 43 - 59 - 75

2 - '02 -120 -146 - 174 - 210 - 274 360 480 - -

- 5' - 7' - 9' - 124 -146 -178 - 214 - 258 - - 37

335 445 585 - - '

- 54 - 79 - '04 - 144 2

-172 -210 - 254 - 310 - 400 525 690 - -

-4 -4

-8+A 0

-lO+A 0

-12+A 0

-15+A 0

-17+A 0

-2O+A 0

-23+A 0

-27+A 0

-3l+A 0

-34+A 0

-37+A 0

-4O+A 0

I--631- 921~ml-170 -202 -248 -300-3651-470-620-80(j- -65 - 'o(j - '34 - '90 -228 -280 - 340 - 415l- 535 - - 700 9al 3 -68 - '08 - '46 - 210 -252 -310 - 380 - 465l- 600 - 780 -loo0 -77 - '22 - '66 - 236 -284 -350 - 425 - 52Ol- 670 - 880 -1'50 -80 - '30 - '80 - 258 -310 -385 - 470 - 740 - 960 -1250 575I- 3 -84 - '40 - 1% - 284 -340 -425 - 520 - 640 - 820 -1050 -1350

-43

-50

- - - - - - -56 -94 158 218 315 -385 -475 580 710 9m -1 mo -1 !%o -98 - '70

4 - 240 - 350 -425 -525 - 650 - 790 -‘IO00 -1300 -1700

- 78 -150 -280-400-600

-155 - 310 - 450 - 660

-88 -175 - 340 - 500 - 740

-185-380-560-840

-100 -210 - 430 - 620 - 940

-220 - 470 - 680 -1050

-120 -250 - 520 - 780 -1150

-260 - 580 - 840 -1300

-140 -300-640-960-1450

-170 -370 - 820 -1200 -1850

-400 - 920 -1350 -2000

-195 -440 -1000 -1500 -2300

-460 -1100 -1650 -2500

1 -50

-56

-66

- 78

- 92

t

-110

-135 -240 -550 -1250 -1900 -2900

-580 -1400 -2100 -3200

3) (concl. ) Examples :

K7 in the range 18 to 30 mm : A = 8 pm, therefore ES = -2 + 8 = + 6 pm

S6 in the range 18 to 30 mm : A = 4 pm, therefore ES = -35 + 4 = - 31 pm

4) Special cases: for tolerance class M6 in the range from 250 to 315 mm, ES = -9 pm (instead of - 11 pm).

5) Fundamental deviation N for standard tolerance grades above IT8 shall not be used for basic sizes less than or equal to 1 mm.

15


IS0 286-l : 1988 (E)

10 Bibliography

The following international Standards on tolerancing and tolerance systems will be useful with regard to the application of this part of IS0 286:

IS0 406, Technical drawings - Linear and angular tolerances - lndica tiuns on drawings.

IS0 1829, Selection of tolerance zones for general purposes.

IS0 1947, System of cone tolerances for conical workpieces from C = 1 : 3 to 1 : 500 and lengths from 6 to 630 mm.

IS0 2692, Maximum

Technical drawings - material principle. 1

Geometrical tolerancing -

IS0 2768-1, General tolerances for dimensions without tolerance indications - fart 1: Tolerances for linear and angular dimensions. 1 )

IS0 5166, System of cone fits for cones from C = 1 : 3 to 1 : 500, lengths from 6 to 630 mm and diameters up to 500 mm.

1) At present at the stage of draft. (Revision, in part, of IS0 2768 : 1973.)

16


IS0 286-l : 1988 E)

Annex A

A.1 General A.2 Basic size steps

Bases of the IS0 system of limits and fits (This annex forms an integral part of the standard.)

This annex gives the bases of the IS0 system of limits and fits. The data are given primarily so that values can be calculated for fundamental deviations, which may be required in very special circumstances and which are not given in the tables, and also so that a more complete understanding of the system is provided.

It is once more emphasized that the tabulated values in either this part of IS0 286 or IS0 286-2, for standard tolerances and fundamental deviations, are definitive, and shall be used when applying the system.

For convenience, the standard tolerances and fundamental deviations are not calculated individually for each separate basic size, but for steps of the basic size as given in table 4. These steps are grouped into main steps and intermediate steps. The intermediate steps are only used in certain cases for calculating standard tolerances and fundamental deviations a to c and r to zc for shafts, and A to C and R to ZC for holes.

The values of the standard tolerances and fundamental deviations for each basic size step are calculated from the

Table 4 - Basic size steps

Values in millimetres Values in millimetres

a) Basic sires up to 500 mm (incl.1

Main steps I Intermediate steps 1) I Main steps I Intermediate steps2)

Above Up to and including Above

I Up to and including

- 3

6

*n IV

40 IO

3

6

10

18

30

No subdivision

10 14 14 18

18 24 24 30

30 50 30 40

40 50

50 80 50 65 65 80

80 120 80 100 100 120 ~~ 120 140

120 180 140 160 160 180

180 200 180 250 200 225

225 250

250 315 250 280 280 315

315 400 315 355 355

400 500 450 450 500

b) Basic sizes above 500 mm up to 3 150 mm (incl.1

Above Up to and including Above Up to and

including

500 630 500 560 560 630

630 800 630 710. 710 800

800 1000 800 900 900 1000

1000 1250 1000 1 120 I im 1 250

1 250 1600 1250 1400 1400 1600

1600 2000 1600 1800 1800 2000

I 2000 I 2500 I 2000 2240 I 2500 2240

I ~~

2500 3 150 2500 2800 2800 3 150

1) These are used, in certain cases, for deviations a to c and r to zc or A to C and R to ZC (see tables 2 and 3).

2) These are used for the deviations r to u and R to U (see tables 2 and 3).

17


IS0 286-l : 1988 E)

geometrical mean (D) of the extreme sizes (0, and 02) of that step, as follows:

D= J&XT&

For the first basic size step (less than or equal to 3 mm), the geometrical mean, D, according to convention, is taken between the sizes 1 and 3 mm, therefore D = 1,732 mm.

A.3 Standard tolerance grades

A.3.1 Gerieral

The IS0 system of limits and fits provides for 20 standard tolerance grades designated ITOI, ITO, ITl, . . . , IT18 in the size range from. 0 up to 500 mm (incl.), and 18 standard toCerance grades .& the‘size range from 500 mm up to 3 150 mm (i&l.), designated tT1 to IT18.

As stated in the “Foreword”, the IS0 system is derived from ISA Bulletin 25, which only covered basic sizes up to 500 mm, and was mainly based on practical experience in industry. The systems was not developed from a coherent mathematical base, dnd ti’ence there are .discontinuities in the system and differing formulae for the deviation of IT grades up to 500 mm. \ , : 8 The-values’for standard tolerances for basic sizes from 500 mm up to 3 l’@ tim (incl.) were subsequently developed for experi- . mental purposes; and since they have proved acceptable to industry they are now given as a part of the IS0 system. -

It should be noted that values for standard tolerances in grades IT0 and IT01 are not given in the main body of the standard because they have little use in practice; however, values for these are given in table 5.

Table 5 - Numerical values for standard tolerances where D is the geometric mean of the basic size step in in grades IT01 and IT0 millimetres (see clause A.2).

Basic size Standard tolerance grades

mm IT01 IT0

Ab.ove Up to and Tolerances including w

. ..- 3 Ot3 Of5 I.3 6 014 Or6 6 10 Of4 016

10 18 0,5 Or8 18 30 016 1 30 50 Or6 1

50 80 W3 12 80 120 1 115

120 180 12 2 180 250 2 3 250 315 2,5 4 315 400 3' 5 400 500 4 6

This formula was empirically derived, being based on various national practices and on the premise that, for the same manufacturing process, the relationship between the magnitude of the manufacturing errors and the basic size approximates a parabolic function.

The values of the standard tolerances are calculated in terms of the standard tolerance factor, i, as shown in table 7.

It should be noted that from IT6 upwards, the standard tolerances are multiplied by a factor of 10 at each fifth step. This rule applies to all standard tolerances and may be used to extrapolate values for IT grades above IT18.

Example :

IT20 = IT15 x IO = 64Oi x 10 = 64OOi

NOTE - The above rule applies except for IT6 in the basic size range from 3 to 6 mm (incl.).

A.3.2 Derivation of standard tolerances (IT) for basic sizes up to and including 500 mm

A.3.2.1 Standard tolerance grades IT01 to IT4

The values of standard tolerances in grades ITOl, IT0 and IT1 are calculated from the formulae given in table 6. It should be noted that no formulae are given for grades IT2, IT3 and IT4. The values for tolerances in these grades have been approxi- mately scaled in geometrical progression between the values for IT1 and lT5.

Table 6 - Formulae for standard tolerances in grades ITOI, IT0 and ITI for basic sizes up to and

including 500 mm

Values in micrometres

Standard tolerance grade

Formula for calculation where D is the geometric mean

of the basic size in millimetres

IT01 ‘1 0,3 + 0,008D

ITOI) ’ 0,5 + 0,012.D

IT1 0,8 + 0,OZOD

1) See the “Foreword” and A.3.1.

A.3.2.2 Standard tolerance grades IT5 to IT18

The values for standard tolerances in grades IT5 to IT18 for basic sizes up to and including 500 mm are determined as a function of the standard tolerance factor, i.

The standard tolerance factor, i, in micrometres, is calculated from the following formula:

i= 0,45 m + 0,OOID

18


ISO286-1:1988 (I3

Table 7 - Formulae for standard tolerances in grades ITl to IT18

Basic size

mm

up to Above and in-

cluding

I- 1) See A.3.2.1.

Standard tolerance grades

ITll) IT211 IT311 IT41) IT5 IT6 IT7 lT8 I-j=10 [J-II lTl2 lT13 lT14 lTl5 ln8 lT17 IT18 \

Formulae for standard tolerances (Results in micrometres)

- - - - 7i 1Oi 16i 25i 40i 64i 1OOi 160i 250i 400i 640i 1OOOi 16OOi 2500i

21 2,71 3,71 51 71 101 161 251 401 641 1OOI 1601 2501 4OOr 6401 looor imr 25mr .

A.3.3 Derivation of standard tolerances (IT) for basic sizes from 500 mm up to and including 3150mm

The values for standard tolerances in grades IT1 to IT18 are determined as a function of the standard tolerance factor, I.

The standard tolerance factor, I, in micrometres, is calculated from the following formula:

I = 0,004D + 2,l

where D is the geometric mean of the basic size step in millimetres (see clause A.2).

The values of the standard tolerances are calculated in terms of the standard tolerance factor, I, as shown in table 7.

It should be noted that from IT6 upwards, the standard tolerances are multiplied by a factor of 10 at each fifth step. This rule applies to all standard tolerances and may be used to extrapolate values for IT grades above lT18.

Example :

IT20 = IT15 x 10 = 6401 x 10 = 64001

NOTES

1 The formulae for standard tolerances in grades IT1 to IT5 are given on a provisional basis only. (These did not appear in ISO/R 286 : 1962.)

2 Although the formulae for i and I vary, continuity of progression is 2 Values for standard tolerances in grades IT1 to IT18 are given in assured for the transition range. table 1 and for IT0 and IT01 in table 5.

A.3.4 Rounding of values for standard tolerances

For each basic size step, the values obtained from the formulae given in A.3.2 and A.3.3, for standard tolerances in grades up to and including IT1 1, are rounded off in accordance with the rules given in table 8.

The calculated values of standard tolerances in grades above IT1 1 do not require rounding off because they are derived from values of tolerance grades IT7 to IT1 1, which have already been rounded off.

Table 8 - Rounding for IT values up to and including standard tolerance grade IT11

Rounding values in micrometres

Basic size Calculated values

obtained from the formulae Above given in A.3.2 and A.3.3 up to 500mm

500mm up to (incl.) 315Omm

Up to and (incl.)

Above including Rounding in multiples of

0 60 1 1

60 100 1 2

100 200 5 5

200 500 10 10 500 1000 - 20

1000 zoo0 - 50

zoo0 5ooo - 100

5ooo loo00 - 200

10 ooo 20 000 - 500 20 ooo 5oooo - 1000

NOTES

1 For the small values in particular, it has sometimes been necessary to depart from these rules, and, in some instances, even from the application of the formulae given in A.3.2 and A.3.3 in order to ensure better scaling. Therefore the values given for the standard tolerances in tables 1 and 5, as appropriate, shall be used in preference to calculated values when applying the IS0 system.

A.4 Derivation of fundamental deviations

A.4.1 Fundamental deviations for shafts

The fundamental deviations for shafts are calculated from the formulae given in table 9.

The fundamental deviation given by the formulae in table 9 is, in principle, that corresponding to the limits closest to the zero line, i.e. the upper deviation for shafts a to h and the lower deviation for shafts k to zc.


IS0 286-l : 1988 E)

Except for shafts j and js, for which, strictly speaking, there is no fundamental deviation, the value of the deviation is inde- pendent of the selected grade of tolerance (even if the formula includes a term involving ITn!.

A.4.2 Fundamental deviations for holes

The fundamental deviations for holes are calculated from the formulae given in table 9 and, therefore, the limit corresponding to the fundamental deviation for a hole is exactly symmetrical, in relation to the zero line, to the limit corresponding to the fundamental deviation for a shaft with the same letter.

This rule applies to all fundamental deviations except for the following:

a) deviation N, for standard tolerance grades IT9 to IT16 in basic sizes above 3 mm up to 500 mm (incl.), for which the fundamental deviation is zero ;

b)- shaft or ho& basis fits, for basic sizes above 3 up to 500 mm (incl.), im!which a hole of a given standard tolerance grade is associated with a shaft of the next finer grade (e.g. H7/p6 and P7/h6), and which are required to have exactly the same clearance or interferences, see figure 20.

In these cases, the fundamental deviation, as calculated, is , adjusted ‘by algebraically adding the value of ,4 as follows :

Es = ES (as calculated) + d

: where d is the difference ITn - IT(n - 1) between the .I standard tolerance, for the basic size step in the given , grade, and that ih. the next finer grade.

v Example :

For P7 in the basic size range from 18 up to 30 mm:

A = IT7 - IT6 = 21 - 13 = 8 pm

NOTE - The rule given in b) above is only applicable for basic sizes bier 3 mm for fundamental deviations K, M and N in standard tolera’nce grades up to’and including IT8, and deviations P to ZC in qtandard tolerance grades up to and including IT7.

Hole-basis fit Shaft-basis fit

(ei) + ITbl)= (ES) + ITn

ITh-I)

Figure 20 - Diagrammatic representation of the rule given in A.4.2b)

The fundamental deviation given by the formulae in table 9 is, in principle, that corresponding to the limits closest to the zero line, i.e. the lower deviation for holes A to H and the upper deviation for holes K to ZC.

Except for holes J and JS, for which, strictly speaking, there is no fundamental deviation, the value of the deviation is inde- pendent of the selected grade of tolerance (even if the formula includes a term involving ITn).

A.4.3 Rounding of values for fundamental deviations

For each basic size step, the values obtained from the formulae given in table 9 are rounded off in accordance with the rules given in table 10. *

20


60286-l :I988 (E)

Table 9 - Formulae for fundamental deviations for shafts and holes

Basic size mm I Basic size

mm Shafts Holes Formulael)

where D is the geometric mean of the basic size

in millimetres

Sign (negative

posYtLe)

Funda- mental

deviation

a - es +--I EI 1 + 1 A I-++& 1

120

120

500

7i#+--l b I - =: 140 + 0,850 EI + B 1 160

= 1,8D 160 500

520 Of2 EI + C 0 40 II c I - I es 95 + 0,8D Geometric mean of the values for C, c and D, d

16D@44

11 Dot41

- 40 500

EI + CD 0 10

EI + D 0 3 150

EI + E 0 3 150

0 1 10 ) cd 1 - / es

0 1 3150 1 d 1 - 1 es

0 131501 e I - I es

0 / --- 10 1 ef / - 1 es EI + 1 EF--- Geometric mean of the values for E, e and F, f

0 131501 f 1 - 1 es 5,500#41 I El 1 + 1 F 1 0 1 3150

0 / 101 fg / - Geometric mean of the values for

I EI

F, f and G, g + 1 FG -I

0 I 3150 I g I - I es 2,5D(‘tN I EI I + I G I’ 0 I 3150

0 1 3150 1 h 1 No sign I es Deviation = 0 1 EI 1 No sign I H I 0 1~ ~Yi~

0 15001 i No formula2) I I I J 101 500

0 3 150 I is 1 “_ 1 2 I EI

I I

+ l70 I JS I 0,5 ITn 0 3 150

I c3 I -

- 0,6 G - ES K4) 0 5005)

Deviation = 0 No sign 3 150

IT7 - IT6 ES

0 - M4) .

0,024D + 12,6 500 3 150

0

500 5003)

3 150 k

+ H ei No sign

31 mm/ + j ei

0

500 500

3 150 n I I + ei Sk--j Es I - N4) ’

0 500

500 3 150

3zei--l Es I - I p4) II 0

500

0

500 P + ei

3 150

3 150 r + ei Geometric mean of the values for P, p and S, s

_ / R4) 1 --/,,

7ik-E-I s I + I ei ++kzi+l Es I - / 9) /+-zE& 24 131501 t 1 + 1 ei IT7 + 0,630 1 ES 1 - 1 T4) 1 24 1 3150

0 1 3150 I u 1 + 1 ei IT7 + D I ES I - I u4) 1 0 1 3150

14 I 500 I v I + I ei IT7 + 1,250 1 ES 1 - 1 v4) 1 14 1 500

01 5001 x I + I ei IT7 + 1,6D I ES I - I x4) 1 0 I 500 181 5001 y 1 + 1 ei IT7 + W I ES 1 - 1 Y4) 1 18 1 500-

0 I m--1-- z I + ei IT7 + 2,5D I Es 1 - 1 24) 1 0 -1 0 I 500 1 za I + I ei IT8 + 3,15D 1 ES 1 - 1 ZA4) 1 0 I 500 0 I 500 I zb I + I ei IT9 + 40 1 ES i - I ZB4) I 0 I 500

0 I 500 I zc I + I ei IT10 + 5D I ES I - I zc4) 1 0 1 500 1) Fundamental deviations (i.e. results from formulae) in micrometres.

2) Values only given in tables 2 and 3.

3) Formula only applies to grades IT4 to IT7 inclusively; fundamental deviation k for all other basic sizes and all other IT grades = 0.

4) Special rule applies [see A.4.2b)l.

5) Formula only applies to grades up to IT8 inclusively ; fundamental deviation K for all other basic sizes and all other IT grades = 0.

21


IS0 286-I :,I988 E)

Table 10 - Rounding for fundamental deviations

Rounding values in micrometres

Basic size

Calculated values obtained from the formulae given in table 9

w

Above Up to and including

5 45 45 60 60 100

100 200 200 300 300 500 500 560 560,. 600 600 800 800 1000

:l ooo 2000 2 ooo 5ooo

. . . . . .

20 x 10n 50 x 10n 50 x 10n loo x 10n

loo x 10n 200 x 10n

up to 500 mm (incl.1 above 500 mm up to 3 150 mm (incl.)

Fundamental deviations

a to g k to zc d to u A to G K to ZC D to U

Rounding in multiples of

1 1 1 2 1 1 5 1 2 5 2 5

10 2 10 .lO 5 10 10 5 20 20 5 20 20 10 20 * 20 20 20 50 50 50

100 100 I

. . .

1 x 10n 2 x 10n 5 x 10n


IS0 286-1 : 1988 (E)

Annex B

Examples of the use of IS0 286-l (This annex forms an integral part of the standard.)

B.1 General

This annex gives examples in the use of the IS0 system of limits and fits, in determining the limits for shafts and holes.

The numerical values of the upper and lower deviations for the more generally used basic size steps, fundamental deviations and tolerance grades have been calculated and are tabulated in IS0 286-2.

In special cases, not covered by IS0 286-2, the appropriate upper and lower deviations, and hence the limits of size, can be calculated from the data given in tables 1 to 3, and tables 4 to 6 in annex A in this part of IS0 286.

B.2 Review of special features

A summary of the features and factors which shall be taken into consideration when using this part of IS0 286 to derive upper and lower deviations for special cases is given below:

- shafts and holes a, A, b, B are provided only for basic sizes greater than 1 mm;

- shafts j8 are provided only for basic sizes less than or equal to 3 mm;

- holes K in tolerance grades above IT8 are provided only for basic sizes less than or equal to 3 mm;

- shafts and holes t, T, v, V and y, Y are only provided for basic sizes greater than 24 mm, 14 mm and 18 mm, respectively (for smaller basic sizes, the deviations are prac- tically the same as those of the adjacent tolerance grades) ;

- tolerance grades IT14 to IT18 are only provided for basic sizes greater than 1 mm;

- holes N of tolerance grades above IT8 are only provided for basic sizes greater than 1 mm.

.B.3 Examples

8.3.1 Determining the limits of size for a shaft 0 4og11

Basic size step : 30 to 50 mm (from table 4)

Standard tolerance = 160 pm (from table 1)

Fundamental deviation = -9 pm (from table 2)

Upper deviation = fundamental deviation = -9 pm

Lower deviation = fundamentaJ deviation - tolerance = -9 -16Opm= -169pm rI

Limits of size:

Maximum = 40 - 0,009 = 39,991 mm

Minimum = 40 - 0,169 = 39,831 mm

B.3.2 Determining the limits of size for a hole 0 13ON4

Basic size step : 120 to 180 mm (from table 4)

Standard tolerance = 12 vrn (from table 1)

Fundamental deviation = -27 + d pm (from table 3)

Value of d = 4 pm (from table 3)

Upper deviation = fundamental deviation = -27 + 4 = -23 pm

Lower deviation = fundamental deviation - tolerance = -23 - 12 pm = -35 pm

Limits of size:

Maximum = 130 - 0,023 = 129,977 mm

Minimum = 130 - 0,035 = 129,965 mm


Is0 286-I : 1988 (El

Annex C

Equivalent terms (This annex does not form an integral part of the standard.)

C.1 General

This annex establishes a list of terms used in IS0 286 (and in other International Standards on tolerances).

NOTE - In addition to terms used in the three official IS0 languages (English, French and Russian), the equivalent terms in German, Spanish, Italian, Swedish and Japanese are also given. These have been included at the request of Technical Committee ISO/TC 3 and are published under the responsibility of the member bodies for Germany, F.R. (DIN), Spain (AENOR), Italy (UNI), Sweden (SIS) and Japan (JISC).

C.2 Notes on, presentation

The numerals 01 to 90 give the alphabetical order for the first language (i.e. English) only (for reference).

The column “Reference clause” refers to the important place) in this part of IS0 286.

clause, sub-clause, etc. in the term is

The words given in “parentheses” indicate that the part of the term placed between them may be omitted.

(or the most

Synonyms have been separated some of the preceding words.

by a semi-colon. Square brackets indicate that the word(s) placed between them may replace all or

Short explanations as regards the term have been presented in note form.

C.3 Recommendations for the user

It is recommended that the users, for convenience, accordingly on the left-hand side of the table.

re-arrange vocabulary alphabetically in their own languages and number


w

bfer

- en

ce

No.

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

Engl

ish

Fren

ch

Rus

sian

G

erm

an

Span

ish

Italia

n Sw

edis

h

accu

racy

gr

ade

degr

e de

pre

ci-

CTen

eHb

TOq(

-

sion

H

OC

TM

Gen

auig

keits

grad

lsts

piel

ac

tual

cl

eara

nce

jeu

eff e

ctif

grad

0 de

pre

cisi

on

jueg

o ef

ectiv

o 0

real

grad

o di

pre

cisi

one

nogg

rann

hets

grad

giuo

co

effe

ttivo

ve

rklig

t sp

el

/Jel

kTBP

lTeJ

lbH

bll;r

saso

p

lsta

bm

a13

actu

al

devi

atio

n &a

rt ef

f ect

if fle

fiCTB

b4Te

flbH

Oe

OTK

flOH

eHM

e

lstii

berm

af3

actu

al

inte

r- fe

renc

e se

rrage

eff

ectif

fie

l&TB

PlTe

JlbH

blti

HaT

fIr

desv

iaci

on

efec

tiva

0 re

al

aprie

to

efec

tivo

0 re

al

scos

tam

ento

ef

fet-

tivo

verk

ligt

avm

&t

inte

rfere

nza

eff e

t- tiv

a ve

rklig

t gr

epp

- -

lstm

af3

actu

al

size

di

men

sion

ef

f ec-

fie

lkTB

MTe

flbH

blfi

tive

pa3M

ep

appr

oxim

ate

dim

ensi

on

flpM

6fll4

3MTe

nb-

size

ap

prox

imat

ive

Hbl

l;l

pa3M

ep

Ung

eftih

rmaf

3

basi

c si

ze ;

dim

ensi

on

nom

i- H

OM

MH

aJlb

Hbl

fi

nom

inal

si

ze

nale

pa

3Mep

Nen

nmal

3

med

ida

efec

tiva

0 re

al

med

ida

apro

xi-

mad

a

med

ida

nom

inal

dim

ensi

one

eff e

t- tiv

a ve

rklig

t m

&t

dim

ensi

one

appr

ossi

mat

iva

dim

ensi

one

nom

i- na

le

char

acte

r of

fit

cara

cter

e d’

ajus

- te

men

t xa

paKT

ep

noca

AKM

Pa

ssun

gsch

arak

- te

r ca

rjrct

er

de a

just

e

NO

TA

- En

des

crip

- ci

ones

ve

rbal

es.

cara

ttere

de

ll’ac-

co

ppia

men

to

NO

TA

- In

des

cri-

zion

i ve

rbal

i.

unge

ftirli

gt

m&t

;

cirk

am&t

basm

att

; no

mi-

nellt

m&t

pass

ning

skar

akta

r

NO

TE -

N

OTE

-

IlPM

ME~

AHM

E -

In v

erba

l En

des

crip

tions

C

noi3

ecH

oeon

wca

- de

scrip

tions

. ve

rbal

es.

Hid

e.

ANM

ERKU

NG

-

In v

erba

len

Besc

hrei

bung

en.

NO

T -

Med

ver

bal

besk

rivni

ng.

clea

ranc

e je

u sa

sop

clea

ranc

e fit

aj

uste

men

t av

ec

jeu dim

ensi

on

de

cons

igne

&art

noca

4Ka

c 38

30-

POM

Spie

l

Spie

lpas

sung

jueg

o

ajus

te c

on j

uego

giuo

co

spel

spel

pass

ning

desi

red

size

3a

4aH

Hbl

Lil

pa3M

ep

Sollm

af3

med

ida

teor

ica

acco

ppia

men

to

con

giuo

co

dim

ensi

one

desi

de-

rata

ijn

skat

m

&t

devi

atio

n O

TKJl

OH

eHM

e Ab

maf

3 de

svia

cion

(o

dife

- re

ncia

1

scos

tam

ento

av

m8t

t ;

awik

else

dim

ensi

onal

to

lera

nce

; si

ze

tole

ranc

e

tole

ranc

e di

men

- si

onne

lle

Aony

cK

paah

nepa

M

alZS

tole

ranz

to

lera

ncia

di

men

- to

llera

nza

dim

en-

sion

al

sion

ale

dim

ensi

ons-

to

lera

ns ;

m

&tol

eran

s

enve

lope

ex

igen

ce

de

Tpe6

OBa

tiMR

requ

irem

ent

I’env

elop

pe

K flO

Kpbl

TM0

Hiill

bedi

ngun

g co

nditi

on

del

cond

izio

ne

del

envo

lven

te

invi

lupp

amen

to

enve

lopp

krav

exte

rnal

[o

uter

] el

emen

t ex

terie

ur

part

[com

- [fe

mel

lel

d’un

po

nent

] of

fit

ajus

tem

ent

Hap

ymtia

fr co

npfl-

ra

ewaf

l Ae

ran

b

8ul3

eres

Paf

3tei

l; Au

l3en

paf3

teil

elem

ent0

[p

ieza

l pe

zzo

este

rno

di

exte

rior

de u

n un

acc

oppi

a-

ajus

te

men

to

utvt

indi

g pa

ssni

ngsd

el

c l I

Japa

nese

R

efer

ence

cl

ause

- - - 4.3.

2

- 4.3.

1

- 4.8

4.10

.1

- 4.6

4.7

5.3.

1.2

See

No.

64


Ref

er-

ence

N

o.

16

17

fit

fit c

ompo

nent

el

emen

t d’

un

[par

t1

ajus

tem

ent

18

fit s

urfa

ce ;

su

rface

d’

ajus

te-

conp

wae

Maf

i m

atin

g su

rface

m

ent

nOBe

pXH

OC

Tb

19

fit t

oler

ance

;

tole

ranc

e d’

ajus

te-

varia

tion

of f

it m

ent

20

fit t

oler

ance

zo

ne ;

var

iatio

n zo

ne

21

fit s

ymbo

l

22

fit s

yste

m

23

fund

amen

tal

devi

atio

n

24

25

26

27

28

fund

amen

tal

[sta

ndar

d]

tole

ranc

e

gene

ral

tole

r- an

ce

hole

inte

rfere

nce

inte

rfere

nce

fit

29

30

inte

rnal

[in

ner]

elem

ent

inte

rieur

BH

yTPe

HH

FlR

part

[com

- [m

tilel

d’

un

ajus

- co

nprir

aerv

rafr

pone

nt]

of f

it te

men

t JJ

eTan

b

inte

rnat

iona

l de

gre

de t

ole-

[C

TaH

flapT

H

bl f

i 1

[sta

ndar

d]

ranc

e in

tern

atio

- Kn

acc

Mew

yHa-

tole

ranc

e gr

ade

nale

[ no

rmal

ite]

POAH

bl

X AO

nyC

KOB

(IT .

. .

) (IT

. .

.)

(IT .

. .)

Engl

ish

Fren

ch

Rus

sian

G

erm

an

Span

ish

Italia

n

ajus

tem

ent

zone

de

tole

ranc

e no

ne

Aony

cKa

d’aj

uste

men

t no

caAK

ti

sym

bole

de

yC

flOBH

Oe

0603

Ha-

I’a

just

emen

t qe

me

noca

AKM

syst

eme

d’aj

uste

- m

ent

&art

fond

amen

tal

tole

ranc

e fo

nda-

m

enta

le

tole

ranc

e g&

&ale

06

141~

3 R

onyc

K Al

lgem

eint

oler

anz

tole

ranc

ia

gene

ral

tolle

ranz

a ge

nera

le

gene

rell

tole

rans

-

-

ales

age

OTB

epC

TLte

Bo

hrun

g ag

ujer

o fo

r0

h8il

serra

ge

HaT

flr

uber

maC

3 ap

rieto

in

terfe

renz

a W

PP

ajus

tem

ent

avec

no

caC

jKa

c H

aTf+

serra

ge

TOM

noca

Aka

conp

frrae

MaR

Ae

Tanb

~

AOfly

CK

nOC

a&KM

cMcr

eMa

noca

Cjo

k

OC

HO

BHO

e O

TKJl

O-

HeH

Me

AOny

CK

CM

CTe

Mbl

;

CTa

Hfla

pTH

bl

I;i

flony

cK

Pass

ung

PaM

eil

Pa(3

fl8ch

e .

Pa&o

lera

nz

PaW

oler

anzf

eld

Pass

ungs

sym

bol

; Pa

ssun

gsku

rz-

zeic

hen

Pass

ungs

syst

em ;

Pa

rJsy

stem

Gru

ndab

mat

3

Gru

ndto

lera

nz

0 be

rmat

3pas

sung

aj

uste

con

apr

ieto

I nne

res

Pat3

teil;

I n

nenp

al3t

eil

inte

rnat

iona

ler

grad

o in

tern

acib

- gr

ado

di t

olle

ranz

a [S

tand

ard-

]Tol

e-

nal

de t

oler

anci

a in

tern

azio

nale

ra

nzgr

ad

(IT .

. .

) (IT

. .

.)

(IT .

. .

)

ajus

te-

’

elem

ent0

[ p

ieza

] de

un

ajus

te

supe

rfici

e de

un

supe

rfici

e di

ac-

aj

uste

co

ppia

men

to

tole

ranc

ia

de

tolle

ranz

a d’

acco

p-

ajus

te

piam

ento

zona

de

tole

ranc

ia

zona

di

tolle

ranz

a pa

ssni

ngen

s to

le-

de a

just

e di

acc

oppi

amen

to

rans

omra

de

sim

bolo

de

aju

ste

sist

ema

de a

just

e

desv

iaci

on

fund

a-

scos

tam

ento

fo

n-

men

tal

dam

enta

le

tole

ranc

ia

fund

a-

tolle

ranz

a fo

nda-

gr

undt

oler

ans

; m

enta

l m

enta

le

grun

dtol

eran

svid

d

elem

ent0

[ p

ieza

] in

terio

r de

un

ajus

te

acco

ppia

men

to

elem

ent0

[p

ezzo

] di

un

acco

ppia

- m

ento

sim

bolo

di

acc

op-

piam

ento

sist

ema

di a

ccop

- pi

amen

ti

acco

ppia

men

to

con

inte

rfere

nza

pezz

o in

tern

o di

in

vsnd

ig

acco

ppia

men

to

pass

ning

sdel

Swed

ish

Japa

nese

pass

ning

I

pass

ning

sdel

pass

ning

syta

pass

ning

ens

tole

rans

vidd

;

pass

ning

s-

varia

tion

pass

ning

ssym

bol

pass

ning

ssys

tem

Eges

avm

&t

grep

pass

ning

inte

rnat

ione

ll to

lera

nsgr

ad

; st

anda

rdto

lera

ns-

grad

(IT

. i

.)

-

Ref

eren

ce

clau

se

4.10

- - 4.10

.4

- 5.2.

3

4.6.

2

4.7.

1

4.2

4.9 4.10

.2

See

No.

26

5.1.

1 an

d ta

ble

1

5 0 iill

L . . ‘gg / E


Y

Ref

er-

ence

N

o.

31

32

33

34

35

36

37

38

39

40

41

42

43

44

Engl

ish

Fren

ch

IS0

fund

amen

- se

rie d

e to

I&

tal

[sta

ndar

d]

ranc

e in

tern

atio

- to

lera

nce

serie

s na

le I

S0

IS0

“hol

e-

syst

eme

d’aj

uste

- ba

sis”

sy

stem

m

ents

IS

0 ((3

ale

- of

fits

sa

ge n

orm

al )

)

IS0

“sha

ft-

syst

eme

d’aj

uste

- ba

sis”

sy

stem

m

ents

IS

0 ((a

of

fits

ar

bre

norm

al )

)

leas

t m

ater

ial

limit

( LM

L)

limit

devi

atio

ns

&arts

lim

ites

limits

of

fit

limits

of

size

line

of z

ero

de-

ligne

d’e

cart

nul ;

vi

atio

n;

zero

lin

e lig

ne z

ero

loos

est

extre

me

of f

it

low

er

devi

atio

n &a

rt in

ferie

ur

mat

ing

mat

ing

size

mat

ing

surfa

ce;

fit s

urfa

ce

max

imum

cl

ear-

ance

dim

ensi

on

au m

i- ni

mum

de

mat

iere

(L

MC

)

limite

s d’

ajus

te-

men

t

dim

ensi

ons

limite

s

ajus

tem

ent

limite

le

plu

s la

rge

appa

riem

ent

dim

ensi

on

d’ap

pa-

riem

ent

surfa

ce

d’aj

uste

- m

ent

jeu

max

imal

Rus

sian

G

erm

an

Span

ish

pFI/J

O

CH

OBH

bl

X

fiOfly

CKO

B M

C0

ISO

-Gru

ndto

le-

serie

de

tole

ranc

ias

serie

di

tolle

ranz

e IS

O-g

rund

tole

rans

- ra

nz-R

eihe

fu

ndam

enta

les

IS0

fond

amen

tali

IS0

serie

cwTe

Ma

no-

CaA

oK

MC

0

,,OC

HO

BHO

e O

T-

eepc

l-we“

ISO

-Pat

3sys

tem

,,E

inhe

its-

bohr

ung”

sist

ema

de a

just

es

IS0

“agu

jero

tin

ico”

(0

“ag

ujer

o ba

se”)

Cw

TeM

a no

caflo

K

MC

0 ,,0

6blr(

Hbl

L;i

Ban

I‘

ISO

-PaT

Jsys

tem

, ,

Einh

eits

wel

le”

sist

ema

de a

just

es

sist

ema

di a

ccop

- IS

0 pa

ssni

ngs-

IS

0 “e

je

tinic

o”

piam

enti

IS0

syst

em

“axe

ln

(o “

eje

base

”) “a

l ber

o ba

se”

has”

npef

len

MM

HM

MYM

a

Mar

epM

ana

(L/W

M

inim

um-M

ater

ial-

med

ida

de m

inim

0 di

men

sion

e di

M

a13

mat

eria

l m

inim

0 m

ater

iale

npef

ienb

Hbl

e

OTK

flOH

eHM

R

Gre

nzab

mal

lSe

desv

iaci

ones

;

dife

renc

ias)

npeA

enbH

ble

3Ha-

qeH

MR

no

ca~K

l4

Gre

nzpa

ssun

gen

ajus

tes

limite

s

Gre

nzm

allS

e m

edid

as l

imite

s di

men

sion

i lim

iti

HyJ

leBa

fl Jl

MH

MfI

;

JlM

HM

Fl

HyJ

leBO

rO

OTK

JlO

HeH

MR

Lini

e de

s Ab

- m

af3e

s N

ull ;

N

ullin

ie

lfnea

cer

o ;

lfnea

de

ref

eren

cia

HaP

l6O

J-I

b U

Iafi

CBO

-

6oAt

.M

noca

AKa

Hijc

hstp

assu

ng

; w

eite

ste

Gre

nz-

pass

ung

unte

res

Abm

al3

ajus

te l

imite

con

m

axim

0 ju

ego

HM

J+tH

ee

OTK

JlO

He-

Hue

desv

iaci

on

infe

rior

conp

m+t

eHM

e Pa

arun

g ac

opla

mie

nto

; ap

area

mie

nto

conp

frrae

M b

l r;5

pa3M

ep

Paar

ungs

maQ

m

edid

a de

aco

pla-

di

men

sion

e di

m

ient

o co

nnes

sion

e

conp

frrae

Maf

i flO

BepX

HO

CTb

PallS

flach

e su

perfi

cie

de u

n su

perfi

cie

di

ajus

te

acco

ppia

men

to

HaH

60Jl

bUJM

lij H

achs

tspi

el

; sa

sop

Gro

Wsp

iel

jueg

o m

axim

0

Italia

n

sist

ema

di a

ccop

- IS

0 pa

ssni

ngs-

pi

amen

ti IS

0 sy

stem

“h

alet

’ ‘f

oro

bas

e”

has”

scos

tam

enti

limiti

acco

ppia

men

ti lim

iti

linea

del

lo z

ero

nollin

je

acco

ppia

men

to

limite

il p

iti l

argo

[s

ciol

tol

scos

tam

ento

in

fe-

riore

conn

essi

one

giuo

co

mas

sim

o

I .I

Swed

ish

Japa

nese

min

. m

ater

ial-

grtin

s ;

stop

pgr&

is

grgn

savm

&t

; gr

finsa

wik

else

grtin

spas

snin

gar

gran

sm&t

stijr

sta

pass

ning

undr

e gr

tinsa

vm&t

tillp

assn

ing

pass

ning

smat

t

pass

ning

syta

max

spel

-

Ref

eren

ce

clau

se

4.11

.2

- - 4.3.

3

4.5

and

figur

e 13

- 4.6.

1.2

- - - 4.8.

2


Ref

er-

ence

N

o.

45

46

47

48

49

50

51

52

53

54

56

56

57

58

59

Engl

ish

Fren

ch

Rus

sian

G

erm

an

max

imum

in

terfe

renc

e se

rrage

max

imal

H

aM6O

nbU

IMfi

Hoc

hstii

berm

ag

j H

aTFI

r G

rU3t

iiber

maf

3

max

imum

lim

it of

siz

e

max

imum

m

ater

ial

limit

(MM

-)

mea

n cl

eara

nce

dim

ensi

on

max

i- m

ale

tiaid

6Onb

UIM

~ rip

e-

_ I.

#eflb

Hbl

L;i

pa3M

ep

Hijc

hstm

al3

; G

rijl3

tmal

3

dim

ensi

on

du

npef

len

MaK

CM

-

max

imum

de

M

yMa M

aTep

Man

a m

atie

re

(MM

L)

(MM

L)

Max

imum

-Mat

e-

limite

de

mat

eria

l ria

l-Mat

3 m

axjm

o

jeu

moy

en

cpeA

HW

sa

sop

mitt

lere

s Sp

iel ;

M

itten

spie

l

mea

n fit

aj

uste

men

t m

oyen

cp

eAH

ee

3Haq

e-

mitt

lere

Pa

ssun

g ;

HM

e no

ca)q

KM

Mitt

enpa

ssun

g

mea

n in

ter-

fere

nce

serra

ge m

oyen

C

peAH

PlG

l H

aTFi

r m

ittle

res

ii be

r- m

a13 ;

Mitt

eniib

er-

ma1

3

mea

n of

the

lim

its o

f si

ze ;

mea

n si

ze

moy

enne

de

s di

- cp

eAH

ee

3Haq

e-

men

sion

s lim

ites

; H

Me

npeA

enbH

blx

dim

ensi

on

pasu

epos

;

cpef

i-

moy

enne

H

ML;

; pa

3Mep

mitt

lere

s G

renz

- m

a13 ;

Mitt

enm

af3

min

imum

cl

ear-

ance

je

u m

inim

al

HaM

MeH

bUlM

ti M

inde

stsp

iel

; sa

sop

Klei

nsts

piel

min

imum

in

ter-

fere

nce

serra

ge m

inim

al

HaM

MeH

bUJM

ti M

inde

stub

erm

af3

; H

aTfir

Kl

eins

tu b

erm

af3

min

imum

lim

it di

men

sion

m

ini-

HaM

MeH

bWM

I;1

ripe-

M

inde

stm

al3

; of

siz

e m

ale

Aenb

Hbl

ti pa

3Mep

Kl

eins

tmaf

3

nega

tive

de-

viat

ion

nom

inal

si

ze ;

basi

c si

ze

&art

nega

tif

OTp

Plqa

Tenb

Hoe

OTK

nOH

eHM

e

nega

tives

Ab

maf

3

dim

ensi

on

nom

i- H

OM

MH

anbH

bfi

nale

pa

3Mep

Nen

nmaf

3 m

edid

a no

min

al

perm

issi

ble

&arts

pe

rmis

- AO

nYC

TMM

ble

OT-

de

viat

ions

1)

si

bles

Kn

OH

eHM

R

Gre

nzab

wei

chun

- ge

n ;

zula

ssig

e Ab

wei

chun

gen

plug

[ =

sha

ft1

tige

[ = a

rbre

] Ka

nM6p

-npo

6Ka

[ = B

an1

Dor

n [ =

Wel

lel

eje

posi

tive

devi

atio

n &a

rt po

sitif

no

nom

MTe

n bH

oe

OTK

nOH

eHM

e

posi

tives

Ab

mat

3 de

svia

cibn

po

sitiv

a

L

Span

ish

aprie

to

max

im0

med

ida

max

ima .-

jueg

o m

edio

ajus

te m

edio

aprie

to

med

io

med

ia d

e m

edid

as

limite

s ;

med

ida

med

ia

jueg

o m

inim

0

aprie

to

min

im0

med

ida

min

ima

desv

iaci

on

nega

- tiv

o

desv

iaci

ones

ad

mis

ible

s

Italja

n ,

. Sw

edis

h Ja

pane

se

inte

r-fer

entia

mas

- si

ma

dim

ensi

one

mas

- si

m,a

.

dim

ensi

one

di

mas

sim

o m

ater

iale

giuo

co

med

io

acco

ppia

men

to

med

io

inte

tfere

nza

med

ia

med

ia d

elle

dim

en-

sion

i lim

iti

; di

men

-

sion

e m

edia

giuo

co

min

im0

inte

rfere

nza

min

ima

dim

ensi

one

min

ima

scos

tam

ento

ne

ga-

tivo

dim

ensi

one

nom

i- na

le

scos

tam

enti

am-

mes

si [

amm

issi

bili]

pern

o [ =

alb

ero]

scos

tam

ento

po

si-

tivo

max

grep

p

ovre

gt%

nsm

&t

max

. m

ater

ialm

stt

; gs

gr&n

s

med

elsp

el

med

elpa

ssni

ng

med

elgr

epp

grsn

sm&t

ens

mitt

vsrd

e

min

spel

min

grep

p

undr

e gr

finsm

&t

nega

tivt

avm

stt

nom

inel

lt m

&t ;

ba

sm&t

4.

3.1

tilla

tna

awik

else

r -

dorn

[ =

axe

l]

posi

tivt

avm

att

Ref

eren

ce

clau

se

4.3.

3.1

4.12

- - - - 4.8.

1

4.9.

1

4.3.

3.2

Figu

re 1

3

- Figu

re 1

3

G

0 I#

L _ *

. . ma

Q

iii

1)

Equi

vale

nt

to “

limit

devi

atio

ns”.


Ref

er-

ence

N

o.

60

rang

e [s

tep]

of

basi

c [n

omin

al]

size

s

refe

renc

e te

m-

pera

ture

rela

tive

clea

r- an

ce (

960)

palie

r de

dim

en-

sion

s no

min

ales

61

62

tem

pera

ture

de

re

fere

nce

jeu

rela

tif

MO

)

63

rela

tive

inte

r- je

u re

latif

O

THO

CM

TeJl

bH

bl f

i

fere

nce

(%o)

N

o)

HaT

Rr

(%I

64

65

66

shaf

t ar

bre

Ban

Wel

le

size

; di

men

sion

size

with

out

(dire

ct)

tole

r- an

ce i

ndic

atio

n

dim

ensi

on

; to

te

1)

dim

ensi

on

sans

in

dica

tion

(dire

cte)

de

tol

e-

ranc

es

67

slee

ve [

= h

ole1

do

uille

E =

al&a

ge]

68

69

stan

dard

to

lera

nce

fact

or

(iI I

)

stat

istic

al

tole

r- an

ce

fact

eur

de

tole

ranc

e (i,

I)

70

step

[ra

nge]

of

nom

inal

si

zes

tole

ranc

e st

atis

- tiq

ue

palie

r de

dim

en-

sion

s no

min

ales

71

sym

met

rical

&a

rts

sym

e-

CM

MM

eTpW

lH

ble

sym

met

risch

e de

viat

ions

tri

ques

O

TKJl

OH

eHM

Fl

Abm

al3e

72

tem

pora

ry

size

di

men

sion

au

xi-

Bcno

Mor

aTen

b-

liaire

H

bl s;

r pa3

Mep

theo

retic

ally

di

men

sion

de

ex

act

refe

renc

e re

fere

nce

theo

ri-

size

qu

emen

t ex

acte

tight

est

extre

me

limite

d’a

just

e-

Hau

6One

e nn

or-

of f

it m

ent

le p

lus

etro

it H

aft n

ocw

ka

Engl

ish

Fren

ch

Rus

sian

MH

TepB

aJl

HO

MM

-

Han

bH

blX

pa

3Me-

POB

HO

pMaJ

l bH

aFl

TeM

-

nepa

-rypa

OTH

OC

MTe

JlbH

bl~

saso

p (9

60)

pa3M

ep

pa3M

ep 6

e3 [n

pn-

Mor

al

yKa3

aHvl

fl

Aony

cKa

KaJW

l[ip-

KOJl

b4

0

[ =

OTB

epC

Tkle

]

eAuH

&a

Aony

cKa

(i, I)

CTa

TMC

TlN

eCKM

h st

atis

tisch

e Ao

nycK

To

lera

nz

MH

TepB

aJl

HO

MM

-

Han

bH

blX

pa

3Me-

POB

Teop

eTw

lecK

wl

theo

retis

c h

ge-

med

ida

abso

luta

pa

3Mep

na

ues

Bezu

gsm

al3

de r

efer

enci

a

I) In

Fre

nch

a “d

imen

sion

” is

nam

ed

“tote

” w

hen

it is

on

a dr

awin

g.

Ger

man

Nen

nmaf

3ber

eich

Bezu

gste

mpe

ratu

r

rela

tives

Sp

iel

(960

) ; be

zoge

nes

Spie

l

rela

tives

ii b

er-

ma1

3 ; b

ezog

enes

ijb

erm

at3

(960

)

Ma1

3

Ma8

ohn

e [d

i- re

ktel

To

lera

nz-

anga

be ;

Fre

imaf

3

Hiil

se

[ = B

ohru

ngl

Tole

ranz

fakt

or

(i, I

); To

lera

nz-

einh

eit

Nen

nmat

3ber

eich

Hilf

smaf

3

Min

dest

pass

ung

; en

gste

G

renz

- pa

ssun

g

I

Span

ish

Italia

n

grup

o de

med

idas

gr

upo

di d

imen

sio-

no

min

ales

na

li no

min

ali

tem

pera

tura

de

te

mpe

ratu

ra

di

refe

renc

ia

rifer

imen

to

jueg

o re

lativ

o gi

uoco

re

lativ

o 06

0)

060)

aprie

to

rela

tivo

(960

) in

terfe

renz

a re

la-

tiva

(960

)

eje

med

ida

; di

men

sion

med

ida

sin

indi

ca-

cion

dire

cta

de

tole

ranc

ias

albe

ro

dim

ensi

one

dim

ensi

one

senz

a in

dica

zion

e [d

iretta

] di

tol

le-

ranz

a

casq

uillo

I=

ag

ujer

ol

unid

ad

de

tole

ranc

ia

(i, I

)

boss

olo

[ = f

orol

unita

di

to

llera

nza

(i, I

)

tole

ranc

ia

esta

- di

stic

a

grup

o de

med

idas

no

min

ales

tolle

ranz

a st

ati-

stic

a

grup

po

di d

imen

- si

oni

nom

inal

i

desv

iaci

ones

si

met

ricas

med

ida

auxi

liar

scos

tam

enti

sim

- m

etric

i

dim

ensi

one

ausi

- lia

ria

dim

ensi

one

teor

i- ca

men

te

esat

to

di

rifer

imen

to

I aju

ste

lfmite

con

m

inim

0 ju

ego

acco

ppia

men

to

limite

il p

iti, s

tretto

Swed

ish

Japa

nese

basm

&tso

mra

den

refe

rens

tem

pera

tur

rela

tivt

spel

(96

0)

rela

tivt

grep

p (9

60)

axel

m&t

; d

imen

sion

icke

dire

kt

tole

- ra

nssa

tta

m&t

hyls

a [ =

haI

]

tole

rans

enhe

t ii,

I)

stat

istis

k to

lera

ns

- -

steg

(om

r8de

n)

av n

omin

ella

m

&t

sym

met

riska

av

mat

t

hjU

pm&t

-

teor

etis

kt

exak

t re

fere

nsm

stt

min

. gr

ansp

assn

ing

- - - -

Ref

eren

ce

clau

se

A.2

7 - - 4.1

4.3 - - 4.7.

5

A.2


efer

- !n

ce

Engl

ish

Fren

ch

Rus

sian

G

erm

an

Span

ish

Italia

n Sw

edis

h Ja

pand

O@

R

efer

ence

:

No.

cl

ause

75

tole

ranc

e to

lera

nce

Aony

cK

. Td

eran

z to

lera

ncia

, ’

’ to

llera

nza

I to

lera

nsvi

dd

; , :-

to

lera

ns

g-B/

k\%

4.

7 -. .

76

tole

ranc

e cl

ass

clas

se d

e to

le-

none

Aon

ycka

To

lera

nzkl

asse

;

. cl

ase

de t

oler

an-

cl&s

e-di

to

llera

nze

tole

rans

; t

oler

ans-

ci

a’s ;

ser

ie d

e to

le-

I. ra

nce;

se

rie d

e To

lera

nzfe

ldre

/he

klas

s /k

\gjg

9

=j

x 4.

7.4

e.

tole

ranc

es

d’u

ne

ranc

ias

de u

n zo

ne

cam

p0

77

tole

ranc

e gr

ade;

de

gre

de t

ole-

cr

enet

i b

4ony

cKa

Tole

ranz

grad

;

grad

o de

tol

eran

cia

grad

o di

tol

lera

nza

tole

rans

grad

/k

\Ew

i 4.

7.2

grad

e of

tol

er-

ranc

e ;

qual

ite

de

Tole

ranz

qual

itat

ante

to

lera

nce

(anc

ien)

(e

hem

als)

78

tole

ranc

e of

fit

; to

lera

nce

d’aj

us-

#ony

cr<

noca

&w

Pal3

tole

ranz

to

lera

ncia

de

to

llera

nza

di

pass

ning

ens

4.10

.4

varia

tion

of f

it te

men

t ;

varia

tion

ajus

te ;

var

iatio

n ac

copp

iam

ento

to

lera

nsvi

dd

; l;f

:ao$

wcl

)

de I

’aju

stem

ent

de a

just

e m

ii!Js

pa

ssni

ngsv

aria

tion

,

79

tole

ranc

e of

to

lera

nce

de

AOny

CK

C#l

OPM

bl

Form

tole

ranz

to

lera

ncia

de

to

llera

nza

di f

orm

a fo

rmto

lera

ns

form

W

SSE

5.3.

2 fo

rme

form

a

80

tole

ranc

e of

to

lera

nce

de

Aony

ck p

acno

no-

Lage

tole

ranz

to

lera

ncia

de

to

llera

nza

di

IBge

tole

rans

-

- po

sitio

n po

sitio

n Xe

HM

Fl

posi

tion

posi

zion

e

81

tole

ranc

e po

sitio

n de

la

pacn

onom

ewe

Tole

ranz

lage

po

sici

&n d

e po

sizi

one

di

tole

rans

lage

Q

$gga

, fi=

49

7.3

posi

tion

tole

ranc

e p(

Ony

CKO

B to

lera

ncia

to

llera

nza

82

tole

ranc

e se

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Is0 286-l : 1988 E)

UDC 621.753X2

Descriptors : dimensional tolerances, fits, fundamental tolerances, definitions’ symbols, designation’ schematic representation’ dimensions.

Price based on 30 pages


ISO 286 1 Limites y Ajustes

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Transcript of ISO 286 1 Limites y Ajustes