729_Specifications for Cupboard Locks

7/30/2019 729_Specifications for Cupboard Locks

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I ndi an St andard 58.x SPECIFICATION FOR DRAWER .LOC&, I . :, CUPBCfARD LOCKSAND BOX LOCKS

First Rqwint JANUARY 993_I

UIk 683.338.3

BUREAU OF INDIAN STANDARDS

( Reaffirmed 2001 )


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I ndian St andardSPECIFICATION FOR DRAWERCUPBOARD LOCKS AND BOX

( Thi rd Rev i si on

1s t 729 - 1979

LOCKS,LOCKS

Builders Hardware Sectional Committee, BDC 15Chairman

Sanr Yusu~ MOWJEEMembers

RefiesentingM. C. Mowjce & Company Private Ltd, Calcutta;ond Builders Hardware Industries Associationof India, Calcutta

SH~I SAHIB SYNCH ( &era&e toShri Yusuf Mowjee )SIIRI D. R. BAHLSHRI S. G. MAHAJAN ( Alfernate)SHRI D. S. CI~AUHANSHRI S. K. KINRA ( Affernate )CONTROLLIGR OF STORLS, EASTERN

- . .Regional Testing Centre ( Northern ) , New DelhiMiniti y of Railways

Engineer-in-Chiefs Branch. Armv Hcadauartcrs

RAILWAYSHIU S. K. DUTTASHRI K. H. Gaxu~r

Housing and Urban Development CorporationsLtd, New DethiSHI~IVIJAY KWAR ( Ahnafe ) Ministry of Defence ( DC! )SHRI N. S. KAMB~J Jayna Trading Corporation, DelhiSH~I RAIiI%II KAXBOJ ( Alternate 1liUI s. c. KAIOOIS

SHRI RAXI P. ~WALRAIIIANISHRI S. D. MAJUBIUEHPIZOF V. S. M~KASHISHIII C. P. LAL ( Alternafe)SHRI AJO~ENDV PAULSnnr AMITABH PAUL (Alternate )SI~RI K. PURKAYASTHASlr~rr R. K. MEUTA ( Alternate )DR A. V. R. RaoSIIRI 0. P. RATRA ( A!tnnafe)SHRI H. S. SET511SIIIZI Y. D. SAIQAL ( Alfernafe )

directorate General of Sllpplirs Sr Disposals,( Ministry of Supply ), New DelhiIndian Institute of Architects, BombayNational Test House, Ca!cuttaInstitution of Engineers ( India ), Calcutta

Gobindo Sheet Metal Works & Foundry, CalcuttaIndian Aluminium Co Ltd, CalcuttaNational Buildings Organization, New DcllliEvcrite Sales Corporation, NL,W Delhi

( Conrirrlled on />.EE@ Copyright 1979

BUREAU OF INDL4N STANDARDSThis publication is protected under the Indiun Copyright Act ( XIV of 1957 ) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of conyrieht under the said AC:.


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( Cc&wedfionr page )MmtbcrS Repesenting

SllRI T. c. SOLANKI Sen-Harvic, BombaySunr N. K. RAGOOWAN~BI ( Altemutc )SUPERINTENDI~~Q SIJ~VEYOR OF Central Public Works Department, New DelhiWORKS ( DA2 )SURVEYOR OF WORKS ( DAZ )( Alfernafe )SHRI D. AJITHA SIMHA,Director ( Civ Engg ) Director General, ISI ( &-o&o Me&r )

secretarySHRI S. SENQUP~AAssistant Director ( Civ Engg ), IS1

Locks and Latches Subcommittee, BDC 15 : 3Convener

SHRI I. C. KIIANNAMembers

Srnu MAIIABIR PRASAD A~ARWAL

ASSISTANT DIRECTOR OF INDUS-TILIiCSS~ttr D. S. CFIAUHAN

Slrur S. K. KINRA (Alternate)SIII~I S. F. Dus~iRegional Testing Centre ( Northern ), New DelhiGodrej & Boyce Manufacturing Company PrivateLtd, Bombay

HOUAINQ COMMIBSIONER Rajasthan Housing Board, JaipurSHRI K. H. GANDHI Ministry of Defence ( DGI ), New DelhiSnrrr AMIT DAS (JAINSIIRI JASWANT SIN~II P. P. Products, AligarhEastern Commercial & Industrial EnterprisesPrivate Limited, Visakha atnamHemu Productions ( India ), b:* gatha._ I

Directorate General of Supplies & Disposals, NewDelhi

Shri Gopal Metal and Wood Works, Aligarh; andThe Quality Marked Locks ManufacturersAssociation, OAligarhDirectorate of Industries, Government of Maha-rashtra, Bombay

SIIT\HII~ SIN~II ( Alternate )s111:l r\lllJN C. 1,$1EL Vaultex Industries, VadodaraSIrI: Aslrorc c:. PATEL ( Allernafe )S,t,:, $,lJl:Ol,i[ KIJhIAlr. SAIUAT, Tiger Products Private Limited, AligarhS~rrtr RILIJIPNI)IIA K~;xAI~ ( Ahnalc)S.;I(T R.&X BAIIU SIIA~MA II. 1~. Products, AligarhSII I:, M \YUI:IIIIA~J. Suxru Security Equipment Manufacturers Limited,

AhrnndabadSlllLl 11~.\IC.~SIIDIIAIB. SIlETlI ( dllcmule )

2


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IS : 729 - 1979

I ndian St andardSPECIFICATION FOR DRAWER LOCKS,CUPBOARD LOCKS AND BOX LOCKS

( Thi rd Rev i si on0. FOREWORD

0.1 This Indian Standard ( Third Revision ) was adopted by the IndianStandardsInstitution on 24 February 1979, after the draft finalized by theBuilders Hardware Sectional Committee had been approved by the CivilEngineering Division Council.0.2 This standard was first published in 1956 and revised in 1963 and thesecond revision was issued in 1969. The Committee responsible for thepreparation of this standard decided to issue this revision after taking intoconsideration various recommendations received from the users and themanufacturers. In this revision the requirement of non-interchangeabilityof keys has been brought in line with those specified in other IndianStandards on locks. The tables showing the dimensions and tolerances forthe various component parts of locks have also been simplified by deletingcertain dimensions which are not essential, and introducing certain newdimensions instead. The limiting dimensions shown in the tables areapplicable only for locks having lever mechanism. However, the limitingdimensions for locks having locking mechanism different from levermechanism shall be as agreed between the purchaser and the supplier.This revision also makes reference to the latest Indian Standards forvarious types of materials.0.3 While issuing this standard, the Sectional Committee took note of theacute scarcity of non-ferrous materials like copper, zinc and their alloysin the country and the need for conserving the use of the same in thenational interest. However, in view of the demand for hardware itemsmade of these materials in overseas markets the Sectional Committee hasretained them specifically to meet the requirements of export. trade. Forall indigenous use it is recommended that hardware items made out ofthese materials should not be used.0.4 In the formulation of this standard due weightage has been given tointernational co-ordination among the standards and practices prevailing


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IS : 729 - 1979in different countries in addition to relating it to the practices in the fieldin this country.6.5 This standard is one of a series of Indian Standards on items ofI~nilclers hardware. A list of standards published so far in the series isgiven on page 20.6.6 For the purpose of deciding whether a particular requirement of thisstandard is complied with, the final value, observed or calculated,expressing the result of a test or analysis, shall be rounded off in accord-ance with IS: J-1960*. The number-of significant places retained inthe rounded oKvalue should be the same as that of the specified value inthis standard.

1. SCOPE1.1 This standard lays down the requirements regarding materials,dimensions, non-interchangeability, manufacture and finish of drawerlocks, cupboard locks and box locks.2. DEFINITIONS2.1 Fore End or Frogt - The part of a lock through which the bolt orbolts protrude.2.2 Rear-End - The end of the lock opposite the fore end.3. SIZES3.1 The sizes of locks shall be 40, 50,65 and 75 mm.

3.1.1 The size of the lock shall be denoted by the overall length of thebody in millimetres measured from the outside face of the fore end to therear-end ( see A in Fig. 1, 2, and 3 ).3.2 The locks of sizes other than those specified in 3.1 may be supplied byagreement between the purchaser and the supplier but the provisions laiddown in this standard shall be generally followed.4. GRADES4.1 The drawer locks, cupboard locks and box locks shall be of thefollowing two grades:

a) Grade 1 - Heavy, andb) Grade 2 - Light.

*Rules for rounding off numerical values ( rcc~isrd.4


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Q ,- LEVER SPRING LOCKING PINLEVER PIVOT t * ----PIN II -f

IeI_I

Ii :Jzh IF-ITI;f:500 i 9$ LBODY PLATE

I Y-KEY PIVOT PINASSEMBLY SHOWN WITH COVER PLATE REMOVED 0

LEVER SPRINGTSLOT ; /4 ;-10 SUIT-! :u9B_____ ____;0 LEVER0 STRIKING PLATE,g=yFL

20 BODY COVER PLATE0 LOCKING BOLT PLATEAND LOCKING BOLT

FIG. 3 TYPICAL DESIGNOF Box LOCK


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18 t 729 - 19795. SHAPE AND DESIGN5.1 The shape, design and mechanism of drawer locks, cupboard locksand box locks and their components indicated in Fig. 1, 2 and 3respectively are illustrative only. The manufacturer may make locks ofany shape other than those indicated in this standard to suit his design.6. MATERIALS6.1 The materials used in the manufacture of various component parts ofthe drawer locks, cupboard locks and box locks shall comply with therequirements given in Tables 1 and 2.7. DIMENSIONS7.1 The leading dimensions of drawer locks, cupboard locks and box lockshaving lever mechanism, and their components and tolerances thereon,shall conform to those given in Tables 3, 4 and 5 respectively.8. MANUFACTURE8.0 General - The drawer locks, cupboard locks and box locks shallconsist essentially of a body plate with cover, locking bolt, locking boltplate, locking mechanism and striking plate.8.1 Drawer Locks

8.1.1 Body Plate - The body plate shall be of ( L shape. The L shall have a slot accurately cut in its centre to suit the locking bolt. Itshall have four holes drilled and countersunk at the back at convenientpoints in it to facilitate fixing and two holes drilled and threaded tofacilitate assembly. An additional hole shall be drilled to suit the end ofthe keys in case male keys are provided. The mild steel body plate shallbe zinc plated according to Designation FeZn5 of IS : 1573-1970.8.1.2 Body Cover Pl at e - The body cover plate shall be of eitheraluminium alloy casting or aluminium alloy sheet, or cast brass, or mildsteel sheet or brass sheet and shall have two slots cut in it for working thekey. It shall have two holes drilled and countersunk at the front-to facili-

tate assembling. It shall also have a hole drilled to fit accurately the leverpivot pin. The mild steel body cover plate shall be zinc plated accordingto Designation FeZn5 of IS : 1573-1970*.8.1.3 Str ik iq Pla te - The striking plate shall be of either cast brass orbrass sheet or aluminium alloy castings or aluminium alloy sheet, and shallhave two pointed lugs cast integral with it; and shall have two or threeholes, drilled and countersunk on the front to facilitate fixing. The catchplate ( not shown in the figures ) shall have a slot cut at its centre to suitthe bolt.*Spccificatioq for electroplatecl coatings of zinc on iron and steel (&t reuision ),

8


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TABLE 1 MATERIALS FOR VARIOUS COMPONENT PARTS OF DRAWER LOCKS, CUPBOARDLOCKS AND BOX LOCKS

COMPONENT

Body cover plateBody plateKeyKey pivot pinLeverLever cover plateLever pivot pinLever spring

YesYesYesYesYes

Yes-

Lever spring ful- Yescrum pinLocking bolt -Locking bolt plate -Locking pin YesScrews YesStriking plate -

( Clause 6.1 )MATERIAL,-_--_--_----_-_------___A- ---------_-L -~-_____- MildSteel Cast BrassBrass Sheet BrassWire Phos- SpringSteelhorBronzeWire

Alumini- Alumi- Alumi- Stainless Malle- urn AlloyPressureDieCastingsYesYes----

niumAlloySheetnium Steel able

YesYesYesYesYes-Yes-YesYesYesYesYesYes

YesYesYesYesYes-

Yes--

Yes

--

---Yes

---Yes-

------Yes------

Wire

-

-----Yes

-----

-----Yes

YesYes-----------Yes

Alloy

-- -Yes

- Yes- -.- -- Yes- -- Yes

-

Iron

--Yes-

-

-- 5f- s53


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IS : 729 1979

iz.9ii)

iii)iv}v)

vi)vii)

viii)ix)x)

xi)

TABLE 2 REQUIREMENTS OF MATERIALS( Clause 6.1 )

MATERIAL SUITALILE GRADES IN INDIAN STANDARDMild Steel Designation Fe 410-S of IS : 226-19751Cast brass Grade 3 of IS : 292-1961sBrass sheet Designation CuZn40 of IS : 410-1977sBrass wire Is : 2704-19644Phosphor bronze wire IS : 760%19755Spring steel wire Gkade 2 of IS : 4454 ( Part I )-I9756Aluminium alloy pressure die Designation 5230 or 4600 of IS : 617-19757castingsAluminium alloy sheet Designation 52000 of IS : 737-1974sAluminium alloy IS : 740-1977sStainless steel Designation 04Crl3, 20Crl3 or 30Crl3 ofIS : 1570 ( Part V )-197210Malleable iron Grade A or B of IS : 2108-197711

Specification for structural steel ( standard quality ) (j@ revision ).zspecification for brass ingots and castings ( revised ).sSpecilication for cold rolled brass sheet, strip and boil ( second revision ).4Specification for brass wire for cold-headed and machined parts.5Specification for phosphor bronze wires for general engineering purposes.JSpecification for steel wires for cold-formed springs: Part I Patented and colddrawn steel wire, unalloyed (Jirsr reuision ).7Specificntion for aluminium and aluminium alloy,engineering purposes ( second revision ). ingots and castings fur general*Specification for wrought aluminium and aluminium alloys, sheet and stripfor general engineering purposes ( second reuision ).sspecification for wrought aluminium and aluminium alloys rivet stock for generalengineering purposes (revised ).lospecification for schedules for. wrought steels: Part V Stainless and heat resisting

steels (@I r& ion ).llspecification for blackheart malleable iron castings (first reuision ).\8.1.4 Locki ng Mechanism - The locking mechanism shall be either ofordinary lever type or of any other type approved by the purchaser.8.1.5 Levers - Ordinary lever mechanism (see Fig. 1 and 2 for illustra-tion ) shall be fitted with 2, 4, 5 or 6 levers as specified by the purchaser.The thickness of the lock shall depend on the number of levers. Thelevers shall be of a uniform thickness and smooth on both faces so as toobtain parallelism. The minimum thickness of a lever, shall be l-25 mm.

10


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--TABLE 3 DIMENSIONS OF DRAWER LOCKS

Nom- .I BNALSIZE

(1) (2) (3)E a) Grade I

40 40 2950 50 3865 G5 4875 75 50

b) Grade 240 40 2950 50 3665 65 3875 75 41

( Clause 7.1 and Fig. 1 )All dimensions in millimetres.

F G X Tl Tz 13 THICK- HOLE TO KEYSr_-h__ ~ r __h__7 r __h__7 NESS OF ACCOM- ~~~~h_~~~Cast- Sheet Cast- Sheet Cast- Sheet SPRINQ MODATE Thick- Out- Len-ing ing ing \VIRE SCREW ness side gth

Min(13)

OF DESICG of DiaNATION WardNo. .

Min(14) (15) (16) (17)

Olin A in Min Min illin Mire Alin Afir2 A i n(4) (5) (6) (7) (8) (9) (10) (11) (12)

14 5 5 2.0 1.25 2.0 1.25 1.6 1.25 0.90 4 1.6 3.2 4017 6 6 2.0 1.25 2.0 1.25 2.0 1.25 1.25 4 I.8 3.6 50

22 7 7 2.0 1.25 2.0 1.25 2.0 1.25 1.25 6 2.0 4.5 6524 8 8 2.5 1.25 2.5 1.25 2.5 1.25 1.60 6 2,2 5.0 75

14 5 5 2.0 1.25 1.6 1.25 1.6 1.25 0.90 4 1.6 3.2 4017 6 6 2.0 1.25 1.6 1.25 1.6 1.25 1.25 4 1.8 3.6 5020 7 7 2.0 1.25 1.6 1.25 1.6 1.25 1.25 6 2.0 4.5 6522 8 8 2.0 1.25 2.0 1.25 2.0 1.25 I.25 6 20 4.5 75

TOL ER- *2 fl - - - - - - - - _ - _ *0*2 *0*3 -ANCES


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t:.TABLE 4 DIMEiSIONS OF CUPBOARD LOCKS 3

( Clause 7.1 and Fig. 2 ) I5:All dimensions in millimetres. sNOMI- A B F G H TI TL? 73 THICK- HOLESTO KEYSNAIL 7--A-- 7 r--h--7 ?--*-_? NESSOF Accox-SIZE Cast- Sheet Cast- Sheet Cast- Sheet SPRINQ r_-_*_-_-MODATE Thick- Out- Len-

ing ing ing WIRE SCREW Iless side gthOFDESIG- of DiaNATION WardNo.Min Min Min Min Min Min Min Min Min Min Min

(1) (21 (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17)a) Grade I

40 40 29 8 11 6 2 1.25 2 1.25 1.6 125 0.9 4 1.6 3.2 4050 50 32 8 13 6 2 1.23 2 1.25 2 1.25 1.25 4 1.8 3.6 5065 65 35 10 16 8 2 1.25 2 1.25 2 1.25 1.25 6 2 4.5 6575 75 38 IO 19 8 2.5 1.25 2.5 1.25 2.5 1.25 1.6 6 2.2 5 75

b) Grade 240 40 27 7 9.5 5 1.6 1.25 2 1.25 1.6 1.25 0.9 4 I.6 3.2 4050 50 29 7 11 5 1.6 1.25 2 l-25 1.6 1.25 l-25 4 1.8 3.6 5065 65 32 8.5 14 7 1.6 1.25 2 1.25 1.6 1.25 1.25 6 2 4.5 6575 75 35 8.5 16 7 2 1.25 2 1.25 2 1.25 1.6 6 2 5 75

ToLER--J-~-J-~ - __ ,_ _ _ _ _ _ - _ f0.2 *to.3 -ANCES


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(1) (2) (3)a) Grade I

40 40 2950 50 3865 65 4875 75 50

b) Grade240 40 2950 50 3665 65 3875 75 41

TABLE 5 DIMENSIONS OF BOX LOCKS( Clause 7.1 and Fig. 3 )

All dimensions in millimetres.71 72 13 THICKNESS HOLE TO KEYSr-_-h-- y r__h__7 c------7 OF SPltlNQ ACCQM- r__--h----~Casting Sheet Casting Sheet Casting Sheet WIRE MODATE Thick- Out- Length

SCREW OR ness sideDESK+ Dia

NATlON WECINo.,Wn Mill Min Min Min Min MilZ Mia(4: (5) (61 (7) (8) (9) (10) 51) (12) (13) (18

2 1.25 2 1.25 1% 1.25 0.9 4 1% 3.2 402 l-25 2 1.25 2 1.25 1.25 4 1.8 3.6 502 1.25 2 1.25 2 1.25 1.25 6 2 4-5 652.5 1.25 2.5 1 25 2.5 1.25 1.6 6 2.2 5 75

2 1.25 1.6 1.25 1.6 1.25 0.9 4 l-6 3~2 402 1~25 1.6 125 1.6 1.25 1.25 4 1~8 3.6 502 1.25 1.6 l-25 1% 1.25 1.25 6 2 4.5 652 1.25 2 1.25 2 1.25 1.6 6 2.2 5 75

T~LEU- 12 &l - - - - - - - - kO.2 *o-3 -ANCES


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IS t 729 - 19798.1.5.1 The slots in the levers shall be accurately cnt,so as. to closelycorrespond with the respective wards of the key. The holes in the leversfor the pivot pins shall be drilled or machine punched to the correct size.Hand punching of the holes shall not be permitted. However, holes maybe provided in the casting itself when manufactured by casting and shallbe machined to the correct&e.8.1.5.2 The false ( dummy ) levers shall not be used. The leversshall work without any appreciable friction or shake on the pivot pin. Theholes and slots in the levers shall be free from burrs.

8.1.6 L ever Spri ng - Each lever shall be fitted with one flat or flattenedwire spring which shall comply with the materials specified in Tables 1and 2. Lever springs when made out of steel wire shall be electroplatedto avoid corrosion. The lever spring fitted into the lever shall withstandthe following tests without showing any sign of permanent set:a) The lever spring shall be pressed down completely so as to touchthe top edge of the lever and released. This shall be repeated12 times, andb) The lever spring shall also stand a transverse load of 15 kgf( 1.5 N) before failure of the joint between the lever and thespring takes place.

NOTE-Th e lever shall be rigidly held flat and a point load of 15 kgf( 1.5 N) applied to the spring gradually.

8.1.7 Locking Bolt - The locking bolt shall be cast or fabricated integralwith the locking bolt plate.8.1.8 Locking Bolt Plate - The locking bolt plate shall have a guide slotto suit the lever pivot pin and a cut on its side for engaging the key.8.1.9 L ocki ng Pin - The locking pin shall be either square or rectangularin section and shall be of mild steel or brass. It shall pass through thelocking bolt plate, shouldered and countersunk riveted at the back. Ifspecified by the purchaser, the locking pin may be cast integral with thelocking bolt plate.8.1.10 L ever Pivot Pin , L ever Spri ng Fu lcrum Pin and Key Pivot Pin - Thelever pivot pin, the lever spring fulcrum pin and the key pivot pin shall beof mild steel in the case of brass body and of stainless steel in the case ofaluminium alloy body, and fitted to the body plate by passing through itand countersunk riveted at the back. If specified by the purchaser, thepins of brass may be used and shall be cast integral with the body plateor shouldered and countersunk riveted. The lever pivot pin and the keypivot pin shall be finished smooth and truly round.

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#S t 729 19798.1.11 Screws - Screws for fixing the body cover plate to the body plateshall be countersunk head machined screws conforming to IS : 1365-1968*.Screws shall be of mild steel and protected against corrosion. However, thescrews may be of brass in case of aluminium alloy bodies.

8.2 Cupboard Locks8.2.1 Body Plate - The body plate shall hav6 two cuts on its sides tosuit the locking bolt. It shall have two holes drilled and threaded tofacilitate assembling. An additional hole shall be drilled to suit the end ofthe key in case male keys are provided. Mild steel body plate shall bezinc plated according to Designation FeZn5 of IS : 1573-1970t.8.2.2 The body cover plate, locking mechanism, levers, lever springs,locking bolt, locking pin, lever pivot pin, lever spring fulcrum pin, keypivot pin, striking plate and screws shall conform to their appropriaterequirements laid down under 8-l.8.2.3 L ocki ng Bolt Plate - The locking bolt plate shall have a slot ofsuitable size at its centre for engaging the key and a cut on its side to suitthe lever pivot pin.

8.3 Box Locks8.3.1 Body Pl ate - The body plate shall be of L shape. The L

shall have two slots accurately cut in it to suit the latches. It shall havefour holes drilled and countersunk at the back at convenient pointsto facilitate fixing and two holes drilled and threaded to facilitateassembling. An additional hole shall be drilled to suit the end of the keyin case male keys are provided. Mild steel body plate shall be zinc platedaccording to Designation FeZn5 of IS : 157%19707.8.3.2 Body Cover Pl at e - ThP body cover plate shall conform to therequirements laid down under 8.1.2. In addition, the top edge of thebody cover plate shall be cut at two places to accommodate the catches.8.3.3 Str ik in g P& e - The striking plate shall have two pointed lugs andshall have two or three holes drilled and countersunk on the frontto facilitate fixing. The striking plate shall have two catches. The catchesin the case of brass striking plate shall be of brass, cast integral with thecatch plate or mild steel fitted accurately to the catch plate, squareshouldered and riveted at the back of the plate and shall be of alun6niumalloy in the case of aluminium alloy striking plate.*Specification for slotted countersunk head and slotted raised countersunk headscrews ( dia range 1.6 to 20 mm ) ( secondevision .tspecification for electroplated coatings of zinc on iron and steel (Jirsl revision).

15


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ISt729-19798.3.4 The locking mechanism, levers, lever spring, locking bolt, lockingbolt plate, locking pin, lever pivot pin, lever spring fulcrum pin, keypivot pin and screws shall conform to their appropriate requirements laiddown under 8.1.

8.4 Keys8.4.1 Each lock shall be provided with a minimuti of two keys.8.4.2 The keys shall be either of the female or male type as specified bythe purchaser.8.4.3 The keys shall function smoothly and without any appreciablefriction in the lock. The wards shall be evenly cut, clearly defined andfree from burrs. The engaging ends of the key wards shall be rounded.The mild steel or malleable cast iron keys shall be nickel and chromiumplated and shall conform to Service Grade No. 2 of IS : 1068-1968*. Thekeys may also be made out of stainless steel or brass if required by thepurchaser.8.4.4 The keys shall be suitably tied to the lock so that they arenot lost or interchanged in transit.

8.5 Assembly - The components of the lock in the finally assembledposition shall not be able to move relative to each other, without theapplication of key.9. PJBN-INTERCHANGEAhBPLITY9.1 Two-Lever Lo&s - The drawer locks, cupboard locks and box locksshall be manufactured to have non-intcrchangeabie keys in a batchconsisting of a minimum of24 locks. In case non-interchangeability in ahigher number is required, it shall be so spccificd by the purchaserat the time of placing the order. A master key may be supplied if requiredby the purchaser.

9.1.1 For the purpose of testing non-interchangeability 6 lucks from eachbatch of 24 locks shall he so selected that the wards of the keys differ fromeach other slightly. Th CSF locks shall then be tested for non-interchange-ability. If key of any of the locks opens any other lock, amongst the6 locks, the lot shall be rrjectcd.9.2 Lo&s with More Than Two Levers -.-- The drawer locks, cupboardlocks and box locks shall be manulactured so as to have non-inter-chan.geability in a batch consisting of a minimum of 100 locks. In cast,non-Interchangeability in a higher number is required, it shall be so

*Specification for electroplatecl coatings of nickel and chromium on iron and steel(Jirst revision ).16


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IS : 729 - 1979specified by the purchaser at the time of placing the order. A master keymay be supplied if required by the purchaser.

9.2.1 For the purpose of testing non-interchangeability, 12 locks fromeach batch of 100 locks shall he so sclccted that. thcl wards of thekeys differ from each other slightly. These IOCliS sl l ;l l l t l l c l l I>c Lc:strd fornon-interchangeability. If key of any of the locks opens any other lockamongst the 12 locks, the whole lot shall be rejected.IO. WORKMANSHIP AND FINISH19.1 Each lock shall be free from defects likely to prevent its correct fixingor affect adversely its reliability in use.19.2 Unless specified otherwise, brass locks and keys shall be finishedbright. Aluminium alloy locks shall be anodized. The anodic coatingshall not be less than the Grade AC15 of IS: 186%1968*. The anodicfilm may be either transparent or dyed as specified by the purchaser.Locks may also be lacquered or spirit polished if required by the purchaser.Il. MARKING11.1 Each lock shall be stamped with the following information:

a) Manufacturers name or trade-mark,b) Number of levers,c) Size of the lock and grade,d) Serial number of the lock, ande) Year of supply ( if specified by the purchaser ).

11.1.1 The lock may also be marked with the ISI Certification Mark.NOTE The use of the IS1 Certification Mark is governed by the provisions ofthe Indian Standards Institution ( Certification Marks ) Act and the Rules andRegulations made thereunder. The IS1 Mark on products covered by an IndianStandard conveys the assurance that they have been produced to comply with therequirements of that standard under a well-defined system of inspection, testin

Puality control which is devised and supervised by IS1 and operated by the prodanducer.SI marked products are also continuous1standard as a further safeguard. Details o r checked by IS1 for conformity to thatconditions under which a licence for theuse of the IS1 Certificati6n Mark may be granted to manufacturers or processors, maybe obtained from the Indian Standards Institution.

11.2 The key shall be stamped with the serial number of the lock to whichit relates.lpecificatjop for anodic co#jpgs on aluminium (Jist ret& on ).

17


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XSt729 -197912. PACKING12.1 Each lock, along with the keys, shall be wrapped in a thin paper andpacked in a cardboard box.12.2 Each box may contain 10 locks of 40 mm size or 5 locks of 50 mm,65 mm or 75 mm size.12.3 Each box shall be marked with the following information:

a) Manufacturers name or trade-mark,b) Type and grade of the lock,c) Size of the lock, andd) Quantity.

13. SAMPLING AND CRITERION FOR CONFORMITY13.1 Sampling and inspection of consignment of locks shall be carried outin accordance with the provisions laid down in Appendix A.

APPENDIX A( Ch.4sf? 13.1 )SAMPLING AND CRITERIA FOR CONFORMITY

A-l. LOTA-l.1 In any consignment all the locks of the same type, grade and sizemanufactured from the same raw materials under essentially similarconditions of manufacture shall be grouped together to constitute a lot.A-1.2 For ascertaining the conformity of a lot to the requirements of thisstandard, the sample of locks shall be selected and tested separately foreach lot.A-2. SELECTION OF SAMPLEA-2.1 The number of locks to be selected at random from a lot shalldepend upon the size of the lot and shall be in accordance with co1 1 and2 of Table 6.A-2.2 The locks in the sample shall be selected at random from the lotand in order to ensure randomness of selection, random number table maybe used.

18


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zTABLE 6 SAMPLE SIZE AND CRITERIA FOR CONFORMITY

( Clam A-2.1 )LOT SIZE

(1)up to 100101 ,, 150151 ,, 300301 ), 500501 ,* 1000

1001 and.above

SAMF-LE IZE PERMIRSIBLENUMBEROFDEBECTIVES(2) (3)8 013 020 032 150 280 3

A-3. NUMBER OF TESTSA-3.1 The locks selected according to A-2.2 shall be inspected fordimensions, workmanship and finish, manufacturing details and smoothworking;A-4. CRITERIA FOR CONFORMITYA-4;I The lot shall be considered as conforming to these requirements ifthe number oflocks failing in any one or more of the requirements doesnot exceed the permissible number of defective locks given in Co1 3 ofTable 6.

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BUREAU OF JNDIAN STANDARDSHeedquarters :Manak Bhavan. 9 Bahadur Shah Zafar Marg, NEW DELHI 110002Telephones : 331 01 31 Telegrams : Manaksenatfw

331 13 75 (Common to all Off ices)Regionel Oifices :Central : Manak Bhavan. 9, Bahadur Shah Zafar Marg.NEW DELHI 110002

l Eastern * l/l4 C.I.T. Scheme VII M, V.I.P. Road, Maniktola, CALCUTTA 700054Northern : SC0 445-446, Sector 35-C, CHANDIGARH 160036Southernt Western : C.I.T. Campus, IV Cross Road, MADRAS 600113: Manakalaya, E9 MIDC. Marot. Andheri (East),BOMBAY 400093Brench Offices :Pushpak, Nurmohamed Shaikh Marg, Khanpur, AHMADABAD 388081

g Peenya Industrial Area, 1 st Stage, Bangalore-Tumkur Road,BANGALORE 560058Gangotri Complex, 5th Floor. Bhadbhada Road, T.T. Nagar.B HOPAL 462003Plot No. 82/83, Lewis Road, BHUBANESHWAR 751002Kalai Kathir Building, 6/48-A Avanasi Road, COIMBATORE 641037Quality Marking Centre, N.H. IV, N.I.T., FARIDABAD 121001Savitri Complex, 116 G. T. Road, GHAZIABAD 2010015315 Ward No. 29, R.G. Barua Road, 5th By-lane.

GUWAHATI 7810035-B-56C L. N. Gupta Marg, ( Nampally Station Road 1HYDERABAD 500001R14 Yudhister Marg, C Scheme, JAIPUR 302005

1171418 B Sarvodaya Nagar, KANPUR 208005Plot No. A-9, House No. 561163. Sindhu Nagar, Kanpw RoaO.LUCKNOW 226005Patliputra Industrial Estate, PATNA 800013District Industries Centre Complex. Bagh-e-Ah Maidan.SRINAGAR 190011T. C. No. 14/1421, University P. 0.. Palayam,THIRUVANANTHAPURAM 695034inspect ion Off ices (With Sale Point) :Pushpanjali. First Floor, 205-A West High Court Road.Shankar Naoar Souare. NAGPUR 440010Institution of Engineers .(lndia) Building, 1332 Shivaji Nagar.PUNE 411005 -*Sales Office Calcutta is. at 5 Chowringhee Approach,P. 0, Princep Street, CALCUTTAt Sales Office is at Novelty Chambers, Grant Road, BOMBAY1 Sales Office is at Unity Building. Narasimharaja Square,BANGALORE

Telephone

!331 01 313:; is3 ::

2184341 29 168 32 92 96

2834839 49 6565 48 2l

6 38 272 67 058-71 19 963 31 77

23108383471

21 68 765 65 076 23 05

621 04

62 61 715 24 35

27680089 65 2822 39 71

Reprography Unit, BIS New Delhi, India

729_Specifications for Cupboard Locks

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