Din8140-1 Sti Thread Dimensions

ICS 21.060.99

Gewindeeinsätze aus Draht für Metrisches ISO-Gewinde –Teil 1: Maße, Technische Lieferbedingungen

In keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.

ForewordThis standard has been prepared by Technical Committee Gewindeeinsätze of the NormenausschussMechanische Verbindungselemente (Fasteners Standards Committee).

AmendmentsThis standard differs from the October 1988 edition in that it has been editorially revised and the specifica-tions for d1 and the number of turns for sizes M14 and M16 have been harmonized with internationalstandards.

Previous editionDIN 8140-1: 1988-10.

All dimensions are in mm.

1 ScopeThis standard specifies dimensions and technical delivery conditions for wire thread inserts (‘thread inserts’,for short) which serve to produce high-strength, wear-resistant internal screw threads in metallic and non-metallic components. They are also used to repair damaged threads and to replace threads worn in service.Thread inserts reduce the susceptibility of bolted connections to cold welding. They are resistant to theeffects of high and low temperatures and to corrosion and ensure a constant coefficient of friction.

2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.

Ref. No. DIN 8140-1 : 1999-07English price group 09 Sales No. 0109

06.00

DEUTSCHE NORM July 1999

8140-1{

Continued on pages 2 to 13.

© No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut für Normung e.V., Berlin.Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen).

Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.

Wire thread inserts for ISO metric screw threadsPart 1: Dimensions and technical delivery conditions

SupersedesOctober 1988 edition.

B55EB1B3C7662F79D1B59483A53B9F2F82C98BEEB793808F6EDD6DB0D1B630B628C36948B1AE19ABDEFD2F904751C089EE27C0D415DC6A1BE2797EE16C9621F4321AABF417794BE84F2B090E0DBC3F68F0B97C2AB4AFA297EF656EDA5794561B

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DIN 8140-1 : 1999-07

DIN 13-1 General purpose ISO metric screw threads – Part 1: Nominal sizes for 1 mm to 68 mmdiameter coarse pitch threads

DIN 13-3 General purpose ISO metric screw threads – Part 3: Nominal sizes for 0,5 mm fine pitchthreads with diameters from 3,5 mm to 90 mm

DIN 267-2 Fasteners – Technical delivery conditions – General requirementsDIN 962 Designation system for fastenersDIN 8140-2 Wire thread inserts for ISO metric screw threads – Tapped holes for thread inserts and

thread tolerancesDIN EN 28839 Mechanical properties of fasteners – Bolts, screws, studs and nuts made of non-ferrous

metals (ISO 8839 : 1986)DIN EN ISO 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts,

screws and studs (ISO/DIS 898-1 : 1996) *)DIN EN ISO 2320 Prevailing torque type steel hexagon nuts – Mechanical and performance properties

(ISO 2320 : 1997)DIN EN ISO 3506-2 Mechanical properties of corrosion-resistant stainless steel fasteners – Part 2: Nuts

(ISO 3506-2 : 1997)DIN ISO 965-1 General purpose ISO metric screw threads – Tolerances – Part 1: Principles and basic

data (ISO 965-1 : 1998)ISO 6410-2 : 1993 Technical drawings – Screw threads and threaded parts – Part 2: Thread insertsBS 4377 : 1991 Specification for tapping of holes to receive wire thread inserts (ISO metric threads)

3 Types and dimensionsThread inserts shall be made from rhombic wire to form a spring-type helical coil. They are classified into typeA inserts, for M2 to M39 and M8 × 1 to M39 × 3 screw threads (cf. figure 1), and type B inserts, with the internalcross section taking the form of a centric polygon and with a locking function, for M2,5 to M24 and M8 × 1 toM33 × 2 screw threads (cf. figure 2).NOTE: Locking is achieved by an increased frictional contact in the thread, preventing the bolt in the connec-

tion from working loose, this resulting in an increased torque when screwing in the bolt.Thread inserts shall be provided with a notch (as shown in figures 1 and 2) permitting removal of the tang afterfitting.

*) At present at draft stage.

1 Notch2 Tang

Figure 1: Type A thread insert

1 Notch2 Tang

Figure 2: Type B thread insert, with lockingfunction

3.1 Nominal lengthThe recommended nominal length of a thread insert is a function of the workpiece material, and the propertyclass of the bolt or the yield strength of the bolt material (cf. table 1).


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Table 1: Nominal length (guideline values)

Nominal length, l1, for a bolt property class/yield strength, in N/mm2,of bolt material, of

Up to 150

Over 150 up to 200

Over 200 up to 250

Over 250 up to 300

Over 300 up to 400

Over 400

Tensile strength ofworkpiece material,

Rm,in N/mm2

Figure 3: Thread insert

1 Thread to DIN 8140-2

Figure 4: Tapped hole Figure 5: Assembly

Key to symbols:d thread size (nominal diameter)d1 major diameter of thread insert before assemblyd2 minor diameter of tapped hole (guideline value)l1 nominal length of thread insert (design value)l2 length of thread insert when fitted (l1 – P)l3 minimum depth of core holel4 minimum length of tapped hole for blind holes and clearance holes (l1 = l2 + P)l5 distance of thread insert from workpiece surface (0,25 P to 0,75 P)l6 maximum length of engagement with tang not removedP pitch


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3.2 Coarse pitch threadsTable 2: Dimensions for inserts, core holes and tapped holes

(with recommended thread sizes)

Thread insert Core hole Tapped holeto DIN 8140-2

Assembled lengths

Threadsize,

d

Numberof

turns 1)

Threadsize

(continued)See page 6 for 1), 2) and 3).


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Table 2 (continued)


Assembled lengths

Threadsize,

d

Numberof

turns 1)

Threadsize



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Table 2 (concluded)


Assembled lengths

Threadsize,

d

Numberof

turns 1)

Threadsize

1) The number of turns may be reduced by 0,25. 2) As l1 cannot be measured in the as-delivered condition, the acceptance criteria shall be d1 and the

number of turns. 3) Recommended diameter of twist drill.


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Table 3: Dimensions for inserts, core holes and tapped holes(with thread sizes not recommended)


Assembled lengths

Threadsize,

d

Numberof

turns 1)

Threadsize

See page 6 for 1), 2) and 3).


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3.3 Fine pitch threads

Table 4: Dimensions for inserts, core holes and tapped holes(with recommended thread sizes)


Assembled lengths

Threadsize,

d

Numberof

turns 1)Thread size


Min. Min. Min. Max.Max.


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Table 4 (concluded)


Assembled lengths

Threadsize,

d

Numberof

turns 1)Thread size

See page 6 for 1), 2) and 3).



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Table 5: Dimensions for inserts, core holes and tapped holes(with thread sizes not recommended)

Thread insert Core hole Tapped holeto DIN 8140-2 Assembled lengths

Threadsize,

d

Numberof

turns 1)Thread size

See page 6 for 1), 2) and 3).4) Thread for spark plugs.



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4 Technical delivery conditions4.1 MaterialsThread inserts shall be made of work-hardened grade A2 austenitic steel with a Vickers hardness from 425 HV 02to 550 HV 0,2 as specified in DIN EN ISO 3506-2 or of work-hardened CuSn6 alloy with a minimum Vickershardness of 260 HV 0,2 as specified in DIN EN 28839.For applications in a highly corrosive environment, work-hardened grade A4 austenitic steel with a Vickershardness from 425 HV 02 to 550 HV 0,2 as specified in DIN EN ISO 3506-2 shall be used.

4.2 Surface roughnessFor the surface roughness of thread flanks, the specifications for rolled screw threads given in DIN 267-2 shallapply.

4.3 Axial proof loadThread inserts with a nominal length as specified in table 1 shall have a design proof load equal to the minimumbreaking load specified in DIN EN ISO 898-1 *).

4.4 Prevailing torqueThe prevailing torque shall be as specified in DIN EN ISO 2320. 5)

4.5 Test temperatureTesting shall be carried out at ambient temperature.

4.6 FinishThe surface of thread inserts shall be bright, except for type B inserts, where it shall be red.

5 DesignationDesignation of a thread insert of type A, for thread size M6, made of grade A2 steel and with a nominal length,l1, of 12 mm:

Thread insert DIN 8140 – A M6 × 12 – A2

If thread inserts are to be supplied with left-hand thread, the symbol LH shall be included in the designation(cf. DIN 962).

EXAMPLE: Thread insert DIN 8140 – A M6 LH × 12 – A2

6 Service temperaturesThread inserts as specified in this standard are designed for use at temperatures in the range from –40 °C to+300 °C.

7 User information7.1 Core holeCore hole diameters (d2) are given in tables 2, 3, 4 and 5. The core holes should not be countersunk, since tappedholes without countersink facilitate the introduction of the thread inserts.Where countersinking is indispensable (e.g. in the case of sealing faces that cannot be finished), the maximumcountersink diameter shall be equal to the major diameter of the tapped hole.

7.2 Tapped holeThe dimensions and limits of size of the tapped hole shall be as specified in DIN 8140-2. For the manufactureand gauging of tapped holes, special screwing taps and plug gauges shall be used.

7.3 Internal threadThe internal thread provided by the thread insert shall have class 6H tolerances. Special tools are required forintroducing the thread insert.

For *), see page 2.5) No prevailing torque has been specified for coarse pitch threads of sizes M2, M2,5 and M3,5 and fine pitch

threads of sizes M12 × 1, M14 × 1,25, M24 × 1,5, M26 × 1,5, M30 × 1,5, M36 × 2, and M39 × 2.


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8 Indication on drawings8.1 Tapped holesThe tapped hole shall be indicated on the drawing by the DIN number and a symbol, as specified in figure 6.

1 Tapped hole DIN 8140 – EG M10

Figure 6: DIN 8140 – A M10 ××××× 15 – A2 tapped hole for thread insert (example)

8.2 Thread insert assemblyThe thread insert shall be indicated on the drawing by the DIN number and a symbol, as specified in figure 7.Unless otherwise indicated on the drawing, the tang shall be removed after assembly.If the tang is not to be removed after assembly, the letter M shall be added to the designation.EXAMPLE: DIN 8140 – A M10 × 15 – A2 – M

1 DIN 8140 – A M10 × 15 – A2a 0,4 to 1,1

Figure 7: DIN 8140 – A M10 ××××× 15 – A2 thread insert assembly (example)

8.3 Assembly drawing

Figure 8: Thread insert/bolt assembly


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Explanatory notesDIN 8140-1 and DIN 8140-2 have been prepared on the basis of standards published in other countries(e.g. British Standard BS 4377), standards issued by the Normenstelle Luftfahrt (Aerospace Standards Com-mittee), and works standards of a number of German manufacturers, the aim being to harmonize the specifi-cations for tapped holes, the associated tolerances, and the product specifications for thread inserts.Users of this standard should note the following.

a) Tolerance class 6H as specified here is the tolerance class for the thread insert after assembly. However,in DIN 8140-2, the tolerance class for the pitch diameter of the tapped hole has been denoted as 6 Hmod toindicate that the tolerance values deviate from those given in DIN ISO 965-1. These ‘modified’ values arealso specified in other national standards and works standards.b) Although tolerance class 4H ‘fine’ is specified in aerospace standards for thread inserts, such narrowtolerances are both impractical and unnecessary for general applications.c) Tables 3 and 5 of this standard include a number of screw threads which do not conform with series 1threads as specified in DIN 13-1 and DIN 13-3 and the use of which is not recommended. In DIN 8140-2, theassociated tapped holes, the use of which is also not recommended, have been listed in a separate table.This table also specifies a number of tapped holes for which no inserts have been standardized, as they arenot commonly used. These tapped holes have nevertheless been included in DIN 8140-2 in order to providespecifications for the user of such screw threads.d) This standard gives examples for the indication of thread inserts and tapped holes on drawings. Inter-national Standard ISO 6410-2 : 1993, which has been approved as a European Standard, also deals with thissubject.

Other relevant standardsDIN 65536-1 Aerospace – Screw-locking copper alloy wire thread inserts rated for 1100 MPa and 425 °CDIN 65536-2 Aerospace – Screw-locking copper alloy wire thread inserts – Assembly and toolsISO 1502 : 1996 ISO general purpose metric screw threads – Gauges and gaugingLN 9039-1 Aerospace – Wire thread inserts rated for 1100 MPa and 235 °C or 425 °CLN 9039-2 Aerospace – Wire thread inserts – Assembly and toolsLN 9499-1 Aerospace – Screw-locking copper alloy wire thread inserts rated for 1 100 MPa and 235 °C

or 425 °CLN 9499-2 Aerospace – Screw-locking wire thread inserts – Assembly and tools


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Din8140-1 Sti Thread Dimensions

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