Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 844-1 (B) (1979): Screwdrivers, Part 1: Technical SupplyConditions(BI-LINGUAL) [PGD 5: Assembly Hand Tools]

iS844(arl):1979 t-J

Indian Standard

SPECIFICATIONFORSCREWDRIVI3RS Part 1 Technical Supply Conditions

( Second Revision )

$-kr?/UDC 624’883*7:006.87

@ BIS 1992

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

%Td/Februarp 1992 %?I d/Price Gcoq t

IS844(mnsl):1979

SPECIFICATION FOR SCREWDRIVERS Part 1 Technical Supply Conditions

( Second Revision )

1 fqss Gii5( 1 SCOPE

‘T$R qT;rF 8 83 ~Tfk JSTiGTT fiTT ;rTft ?FfJ +i? iFt Covers technical supply conditions for hand-

WGT+i fqc( +Fm3 T3 a;F;*ti $3 3Ta",m-d, operated screwdrivers for slotted head and grub

m;stT?fT, qirfhft, f%fTm a7 V%TT %fTst' +i* screws, requirements in respect of material, h ar d ness, workmanship and finish and methods

a;ierrd FHfT?r$l JTf g I hB w;F;F; ;f 3 mm + of test. Specifies the dimensions for three types

+~rnV> ti +T$?i t fFTp 3TTqTq $7 f%f+T WS7 % of screwdriver points and also gives guidance in

+TT 3 fZF 8~7 ;r+ii qT% +f”fiFT $i aP&T 9 tiiil%?T respect of the correct application of screwdrivers points for various sizes of screws.

sT?P&T f+f%a fvq TT g I

2 W?TPa? 2 NOMENCLATURE

TV JTT;yg b SUhFf % fTq %T!& 1 3 ft qrd TTqTaa For the purpose of this standard, the nomen-

,+TTT +? 9Ty I chture as given in Fig. 1 shall apply.

NOM DIA Of

HEXAGd

THICKNESS

LENGTh OF BLADE

WTvfa 1 $WTR? 3 @Tp WfTW4

FIG. 1 NOMENCLATUREFOR SCREWDRIVERS

+itg Point

Cannel -+T3

Nom dia of blade zbs sr ~i%fa;F;wtr

‘Tang 3T

Thickness of point +it;r; 73 stzti

Length of tang inserted @XT 8 3 T$$ &T a in handle -n-?

Length of blade G%s %i a=TTf

Length of handle gsa * wW$

Hexagon s+rT-Trf Nom Dia of Blade z&3 %T 3TfVfv =ITtT

1

3 MATERIAL

3.1 Blade

The blades shall be manufactured from suitable steels which after a suitable heat-treatment fulfil the requirements laid down in 4 and 8. Some of the suitable steels for the manufacture of screw- driver blades are 50CrlV23 with sulphur and phosphorus contents of 0’05 percent each and C55 as specified in IS 1570 : 1961 ‘Schedules for wrought steels for general engineering purposes’.

3.2 Handles

3.2.1 Wooden Handles

The wooden handles when supplied shall conform to class 5 of IS 620 : 1975 ‘Specification for general requirements for wooden tool handles ( third revision )‘. i

3.2.2 Plastics Handles

Shall be solid and manufactured from cellulose acetate. Other suitable plastics may also be used depending upon the agreement between the supplier and the purchaser. One of the suitable plastics for this purpose is cellulose acetate con- forming to IS 2543 : 1964 ‘Specification for cellulose acetate moulding and extrusion material’.

3.3 Ferrules

The ferrules shall be manufactured from steel conforming to type D of IS 513 : 1973 ‘Specifica- tion for cold rolled carbon steel sheets ( second revision )‘.

3.4 Insulating Sleeves

The blades of the screwdrivers may also be provided with insulating sleeves depending upon the agreement between the supplier and the purchaser. In case the insulating sleeves are to be provided they shall conform to IS 1951 : 1961 ‘Specification for polyvinyl chloride sleeving for electrical purposes’.

4 HARDNESS

The screwdriver blades shall be properly heat- treated on their full length and shall possess a minimum hardness of 485 HV( 48 HRC approx ) over at least four times the width of the screw- driver blades from the working end of the blade,

5 DIMENSIONS

5.1 The dimensions for screwdriver points shali be as given in Table 1.

2

IS 844 ( VTV 1) : 1979

Table 1 Dimensions for Screwdriver Points, Types 1, 2 and 3 ( Clauses 5.1 and 8.1.1 )

---It!--

TYPE 1

Type Section XX

TVPE 2

==I FFTi

-_ w;5 xx

a* arrms f4* 4 All dimensions in millimetres

TYPE 3

tidiyf emr 3 *a Tr wrsa

y x a Nominal Screwdriver

Point Size UXb

q q-2 yz a? 97 BZ Tolerance Toleran”ce

on a on b

w> WTVT

f, Approx

aTPI,

WTWr

Ap;rox

0.4 x l-6 + 0.06 - 0.14 - 0.00 0.7

0.4 x 2.5 + 0.06 - 0.00 - 0.14 0’7 - -

0.5 x 3.5 + 0.06 0.02 - 0.18 1.0 0.3 -

-

0.6 x 4.0 + 0.06 - 0.04 - 0.18 1.1 0.3 -

0.6 5.0 + 0.06 x - 0.04 0.30 1‘3 -

0.3 -

0.8 x 5.5 I- 0.06 - 0.04

0.30 1.6 -

0.6 -

1.0 x 6.5 f 0.06 - 0.36 2.0 0.6 50

1.2 x 8.0 f 0.06 - 0.36 2.3 0.6 80

1.6 x 10.0 + 0.06 - 0.09 -- 0.36 2.7 0.9 140

2.0 x 13.0 + 0.06 - 0.12 - 0’43 3.6 1.0 170

2‘5 x 16.0 + 0.06 0.14 - 0.43 4.5 - 1’1 200

3.0 x 14.0 + 0.06 - 0.14 0.43 6.0 - 1.2 250

4.0 x 22.0 t ;:y; - 0.52 8.0

1.5 300

5.0 x 25.0 + 0.06 - 0.19

0’52 10.0 - L 1.5 400 .

3

IS 844 (ml):1979

5.2 ?TW? % '~6~6 % ~7% % WTW~~ TRW% 2 3i 5.2 The dimensions of the plastics handles of the

qirx@i screwdrivers shall be according to Table 2.

5.3 6F6Fi? % Ffi@ % $j$? ?i ZWI~ w’i STTWI 5.3 The dimensions and shape of the wooden

&rr aitT $%zrf * 477 $-‘i aWlR 3 3T‘3Wi $I 1 handles of the screwdrivers shall be as agreed to between the purchaser and the supplier.

arVii 2 kxf 3 WrfFwI pi? +i w1913

( *s 5.2 )

Table 2 Dimensions for Plastics Handles of Screwdrivers

( Clause 5.2 )

-5 mm

60 5 60 5 IO 7 70 7 80 14 80 14 90 25 90 25

100 35 100 35

. 110 50 110 50 120 70 120 70 70 23 70 23 50 23 50 23 25 5 25 I 5

S; = !&all gAp I

f&w - alTim7 % rim $mr WkTh % fqy @ -$ I NOTE - The values of volume are for the purpose of guidance only.

4

IS 844 ( WI 1 ) : 1979

5.4 F&fq:rT fTTT $T?i ?m %fsF;Ff;uf $i VT’4 assh ~73 5.4 Recommendations for correct application of

t f+y +Mi? +T ;ri%? a; 8$ JSS-?~ t fTF fTTBTf?G screwdriver points for use with slotted head and

FTTifi 3 8 Z? Vf $ I grub screws are given in Table 3.

Table 3 Recommendations for Application of Screwdriver Points

( Clause 5.4 )

Ff* JITWrl f99”f 3 Ail dimensions in millimetres.

nfoTf@ s’as?l ti ;rtri; * tlTSsT

p x ti Nominal Screwdriver

PoF\Spe

0.4 x- I%---- 0.4 x 1.6 0.4 x 2 5 0.4 x 2.5 0.5 x 3.5 0.5 x 3 5 0’6 x 4’0 0.6 x 4.0 0.6 x 5.0 0.6 x 5.0 0.8 x 5.5 0.8 x 5.5 1.0 x 6.5 1.0 x 6.5 1.2 x 8’0 1.2 x 8.0 1.6 x 10 1.6 x 10 2.0 x 13 2.0 x 13 2.5 x 16 2.5 x 16 3’0 x 14 3.0 x 14 4.0 x 22 4.0 x 22 5.0 x 25 5.0 x 25

-

_

. -

. -

.-

-

-_

- _

-_

_-

.-

I -

s’s%% m ma Slotted Head Screwdriver

Size

vi ?nT% Grub Screw

Size

- y?T 2 5 - M 2.5

w 1’6 VIT 3 ti 1.6 M3

ys 2, ys 2’2 P94 M 2, M 2.2 M4 49 2’2, w 2’5 -- M 2.2,’ hi 2’5

I

- - lT95 - rh5

PV 3, TW 3’5 qs 6 M 3, M 3.5 M6

W 4. CFT 4.5 ‘?ls 8 kl4: th 4.5 ti8 rm 5 W 10 iii Ii4 10

v 6 p9 12, ps 14 M6 M 12, M 14

Vq II as 16 ils ! ti 16

p9 10 ~9 18, yq 20 M 10 M 18, M 20

- ys 12, Cy 14 ~9 22, ~9 24 M 12, M 14 M 22, M 24

w 16. m 18 I - ti 16;ti 18 -

Cy 20 - M 20 -

6 GENERAL REQUIREMENTS

6.1 The blades shall be free from seams, burrs, cracks or other manufacturing defects and shall be finished smooth and bright all over.

6.2 The handles shall be provided with proper serrations so that the handles do not slip during usage. The handles shall be finished with smooth and shall be convenient for holding.

5

6.3 The screwdriver points shall be ground blunt and shall lie in the same plane as the axis of the blade.

7 FINISH

The blades of screwdrivers shall be protected against rust by plating with nickel, chromium or zinc; or by any other suitable process. A clear polish or lacquer shall be applied to wooden handles to give a good finish.

8 TESTS

8.1 Torque Test

For the purpose of torque test any suitable device which permits the application of a known load in the correct manner may be employed. A simple device recommended for this test is shown in Fig. 2 ( also see 8.1.1 ). The screwdriver point shall be inserted in slot and the handle shall be clamped suitably in the middle of the natural manual grip. The working end of the blade shall be subjected to a torque as laid down in Table 4. The torque shall be applied gradually without jerk and without any relative slippage. At the completion of the test the screwdriver shall not show any crack, rupture or any sign of perma- nent deformation or any other damage which may influence the usability of the tool.

FIG. 2

Screw driver

Stationary holder

TORQUE TESTING DEVICE FOR SCREWDRIVERS

:a ph$i Test disc V%Vr VI3

WY WV5

6

IS 844 ( ‘41rI 1 ) : 1979

FlTVJii 4 cr’Wfd + f3y VWJi

( @is 8.1 )

Table 4 Testing Torque for Screwdrivers

( Chuse 8.1 )

SIlif W9TET fq9? % A11 dimensioos in millimetres.

af’4fea GaVrR * W%Wl anrE@ ;rfa WI Vt!$a WW

g x %t Testing Nominal Torque

Screwdriver Point Size

nxb N.M 0.4 x 1.6 I 0.2 0.4 x 2’5 o-4 0.5 x 3.5 0.9 0.6 x 4.0 1.4 0.6 x 5.0 1.8 0.8 x 5.5 3.5 I*0 x 6.5 6.5

aRl$a +Vtiu 3 it* ar VrF;Jr

VMJt SW?@ VW

y x q7 Testing Nominal Torque

Screwdriver

‘Y:: Sbze N.M 1.2 x 8.0 11.5 1.6 x 100 25.6 ~~ 2’0 x 13.0 52,o 2.5 x 16,O IOO*O 3.0 x 14.0 126-O 4.0 x 22.0 352-O 5.0 x 25’0 625.0

8.1.1 The test disc slot profile shall correspond to the type of tip manufactured. The tolerance for the width and depth of slot of the test disc shall be C9 and h13 respectively. The test disc shall have sufficient strength not to deform and shall have a hardness of at least 800 HV or 64 HRC. The length of the screwdriver tip inserted in the disc shall correspond to the values of t, Min as given in Table 1 ( see Fig. 2 ).

8.2 Striking Test

The blade of the screwdriver shall be laid flat on a steel block and the working end struck four times with a 200 g hammer [ see IS 811 : 1958 Specification for hand hammers ($rst revision )] from a. height of 150 mm. The working end shall not show visible signs of cracks of other defects on the completion of this test.

9 PRESERVATION AND PACKING

9.1 The blade of each screwdriver shall be coated with a suitable rust proofing material, where necessary.

9.2 Screwdrivers, after treatment as given in 9.1, may be packed in suitable cartons bearing the type, nominal size, number of screwdrivers packed, manufacturer’s name, initials or recog- nized trade-mark and the country of manufacture.

Each type and size of screwdrivers shall be packed separately.

10 SAMPLING

Unless otherwise agreed to between the supplier and the purchaser, the procedure given in IS 2500 ( Part 1 > : 1973 ‘Sampling inspection tables ; Part 1 Inspection by attributes and by count of defects ( first revision >’ shall be followed for sampling inspection. The sampling plan for various characteristics shall be as given in 10.1 and I0.2.

10.1 For examining dimensions, general require- ments and finish, the sampling plan with inspec- tion level III and Acceptable Quality Level ( AQL ) 2’5 percent given in Tables 1 and 2 of IS 2500 ( Part 1 > : 1973 shall be followed.

10.2 For testing hardness, torque and striking tests, the sampling plan with inspection level I and Acceptable Quality Level ( AQL ) 2’5 percent given in Tables I and 2 of IS 2500 ( Part 1 ) : 1973 shall be followed.

I1 MARKING

Hardness or blades of screwdrivers shall be clearly and legibly stamped with the type, nominal size of screwdriver, manufacturer’s name, initials or recognized trade-mark.

11.1 IS1 Certification Marking

Details available with the Indian Standards Institution.

mBm3Tb *a EXPLANATARYNOTE

+fiFq +? titm % fqfY3 WliT7 3 ??W-bT, +i i The applications of different types of screwdriver

YWT’i W fT+T 6% I ST&F VET7 ;iaW +t ;it% ;ii points would depend on the types of screw.

JJT’$q 3 fTfq3 fs;sT qT FFGTT 8 I SC 9Tq5 WbTs. Each type can be manufactured up to a limited point sizes of screwdriver.

1962 3 SFCTfh $3TT elT X?i fRT 1972 3 9o;rffRT f;f;qT WT I ‘$B%T s?RT ~V’ki~ h?T J&9 % fFsT

This standard was first published in 1962 and

WT f% $Fi% $q WTFT7~ tTfr9fTT f%y qT F% fqB% revised in 1972. The second revision has been taken up to incorporate certain modifications so

s$ mr$ a?hTTq ff+‘T Fd’%t + a3F;q W 6 I as to bring the standard in line with the present

+fs;q +? ;rt;r STBTi 5 %?, 33% 8 i;?Tfqy gZT fC9T manufacturing techniques. The screwdriver point

r197 8 ss’ffq ‘$FTV Wf;Ts MTT 3 ?t fS4-T qT WRT

type 5 has been deleted because type 3 can serve the purpose. A clause on dimensions of plastics

8

IS 844 ( VW7 1 ) : 1979

9.3qUT qFfT@ qT;T-? iFT TfTZW f+;rfTfK?i qq The testing torque values have been calculated

S+t9TCT W.+ f%XT WT 8: using the following formula:

ry = G? - qa M=ba2

s@ where

y9 = ;3FT r&T 3 V&VT VA-T@ M = testing torque in newton metres,

ti = fqti 4 +FliV 3'?i a@-Tf b = screwdriver point thickness in milli-

metres, and qa = fsrir 3 +WT %? ;ItT ;ir?' 9tZT$ a2 = screwdriver point thickness in milli-

metres. kwf~fqa vmi?s WrFY 4 qwr w wm 3 The screwdrivers specified in this standard are

af+Tfm?T %MT, +Ti=TY fgT qTt% $7 TFT ;i’+ + intended for use with slotted head and grub

FWT W+T G+ r+Ty 8: screws conforming to the following Indian Standards:

IS 1365 : 1978 @f~7 ti;i% &Vr fh ~3 %W IS 1365 : 1978 Slotted countersunk head screws ( +&TIT ‘TJFh7’JT ), ( third revision ),

IS 1366 : 1968 ti%CTi +ET fRt $T$ +TWT IS 1366 : 1968 Slotted cheese head screws ( dia

( WTTTT 1.6 ?T 20 f9R? ) ( 9cFTT range 1’6 to 20 mm ) ( first

cru;rfkVT ) ) revision ),

Is 2388 : 1971 FffWCT7 %i @a ( cl~FITr5;r~WJT ), 1s 2388 : 1971 Slotted grub Screws ( first

IS 5380 : 1969 GTTWTY *ig &T?l’ ?i%? m?T *T revision ),

IS 5308 : 1969 Slotted countersunk head and

Fh5T-c +j Qfq3 fVi ?T% $2 slotted raised countersunk head

f+TT $T8 ( =fW 1.6 ?T 6 f+ii ), screws, small head series ( dia 1’6to6mm),

IS 6736 : 1972 &f?T7 32 $y ti$j af;ra fiTi sT$ IS 6736 : 1972 Slotted raised countersunk head a+T 4 ?WFT, woodscrews,

IS 6739 : 1972 &=FTTTi rit?i fvi m?i FT;F$ + IS 6739 : 1972 Slotted round head wood screws

;iaslFT,

IS 6760 : 1972 &T?Ti tiig niTfT7 fTTi $I% v@?' IS 6760 : 1972 SIotted countersunk head wood

i &VT, aT‘fi screws, and

IS 8911 : 1987 Cff%Ti 32 BT sig RfT-3 fPFT ST% I§ 8911 : 1978 Slotted raised countersunk head

GMT I screws.

$FT rlT;IB iFT fTYfVT ;T;i+ % tiWf3fVT FFTVT? ti In the formulation of this standard, assistance

FfcTTsFiT SITFT ti sf 8: has been derived from the following publications:

IS0 2380 : 1972 F% TTWi z?TS $3 F% I aia+~h IS0 2380 : 1972 Screwdriver blades for slotted

9TFi+67V tiJTa;r head screws. International Organisation for Standardization.

DIN 5264 tiq;r iii57 fR7 fhi;$u +‘w +b$v &$7 DIN 5264 Schraubendreher fiir schlitzschrauben

+FT ( FT $TSSi ‘FiTi W??J i+’ ‘je SlW F&T, schraubendreherschneiden ( Screwdrivers for

FT $Ti;W?, +isp )

slotted head and grub screws; screwdrivers blades ). Deutsches Institut fur Normung ( DIN ).

DIN 5268 ‘j?q;r &$7 fa'RT 8it8 '+!5 DIN 5268

FiTfkF $JFB W7 ViJ $T?d ) Kunststoff ( Plastic handles for screw- drivers ). Deutsches Institut fur Normung ( DIN ).

?TTT W VTT: W3% F&TT

( Wi? aTd+i‘i t fqp WTT;T )

2i;itPjt;T

f331 01 31

I 331 13 75

36 24 99

f 31641 -j+ 21842

i

235 04 42

235 15 19

1235 02 16

632 92 95