Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक 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. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS 2048 (1983): Parallel Keys and Keyways [PGD 31: Bolts, Nuts and Fasteners Accessories]! न $ एक न' भ रत क +नमण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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4 UDC ~8 ( Second Reprint MARCH 1993 ) IS : Indian Standard SPECIFICATION FOR PARALLEL KEYS AND KEYWAYS.. ( Second Revision / I. Scope Covers the dimensions and tolerances for parallel keys and keyways.!. Types The keys shall be of the following types: Type A Keys with both ends round. Type B Keys with both ends square. Type C Keys with both ends round with hole for one retaining screw (for sizes 8 X 7 and upwards and for key lengths above the stepped line in Table 4 1. Type D Keys with both ends square with hole for one retaining screw ( for sizes 8 X 7 and upwards and for key lengths above the stepped line in Table 4 1. Type E a) Keys with both ends round with holes for two retaining screws ( for sizes 8. X 7 and 10 x 8 and for key lengths below the stepped line in Table 4 ), b) Additionally provided with tapped hole for one or two jacking screws for sizes 12 x 8 and upwards. Type F a) Keys with both ends square with holes for two retaining screws ( for sizes 8 x 7 and 10 x 8 and for key lengths below the stepped line in Table 4 ). b) Additionally provided with tapped hole for one or two jacking screws for sizes 12 x 8 and upwards. Type G Keys with both ends square with chamfer and hole for one retaining screw. Type H Keys with both ends square with chamfer and holes for two retaining screws. Type J Keys with both ends square with chamfer and hole for one spring dowel sleeve. NoteTypes A, C and E are meant for machine tools application also, 3. Dimensions 3.1 Keys Dimensions for keys are given in Table 1 read with Fig, Retaining screws, jacking screws and spring dowel sleeves for keys are given in Table Keyways Dimensions for keyways are given in Table Preferred length and weight of keys Preferred length and weight of keys is given in Table Designation designated as: A parallel key of Type A, width 12 mm, height 8 mm and length 50 mm shall be Parallel Key A 12 x 8 x 50 c 4.1 If keys of Types E and F from 12 x 8 size upwards are required to be supplied wiaout holes for jacking screws ( OS ), this shall be stated when ordering. In this case the designation for a key of Type E, width 12 mm, height 8 mm and length 50 mm shall be as follows: Parallel Key EoS 12 x 8 x 50 I Adopted 17 January 1983 December 1983, BIS BUREAU OF 1NDlAN STANDARDS MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG NEW DELHI I Gr 5

5 ^. ls: N9 d P hi SECTION XX P TYPE A t., I TYPE B fi!zzb SECTION I SECTION YY TYPE C t TYPE D SECTION YY TYPE E lb) SECTION 2.2 [*I TYPE F ib) SECTION 22 TYPE G TYPE H TYPE J SECTION VV Note Types A, C and E are meant for machine tools application also. FIG. 1 DIMENSIONS AND TYPES OF KEYS ( see Table 1 ) 2

6 IS : TABLE 1 DIMENSIONS FOR KEYS ( Clause 3.1 and Fig. I ) All dimensions in millimetres. b Tolon b h Tol on h* a s Range of Key Length Range of Key h9 I Length ( for Machine ~ Tools ~~~~ Only ) Min Max Min Max Min Max ~~~ to25 _ _ a Jo30 5 : IO 56 I I o40 I3 90 I _ ~ IO :*036 a I2 a co I6 Jo ia II _. 20 I I to52 14 omllo I a ia a :.I Pm ~ I ~ I ~074 $ :*I ia o Note Keys with b = 4 to 40 are meant for machine tools application also. *ToI on h : Square Section h9; Rectangular Section hll. 3

7 1S: TABLE 2 DIMENSIONS FOR RETAINING SCREWS, JACKING SCREWS, AND SPRING DOWEL SLEEVES FOR KEYS ( Clause ) All dimensions in millimetres. HOLE FOR RETAINING SCREW HOLE FOR JACKING SCREW Key bxh 2x2 _ 3x3 4x41 5x5 6x6 8x x x x9 5.5 _~ 16x10 20x x x ~ 28x x x x 14 45x 14 50x x ~ x x x x50 22 HOLE FOR SPRING DOWEL SLEEVE Holes for Retaining Screws, Jacking Screws and Spring Dowel Sleeves Retaining Kf?V Shaft Screw? d:, : 6 I de 12 Sleeve$ mm_ _ Pp ~ m 4 M _; PC ~ 4 M _ 7 M3x8 4x8 ~.~ 8 M3xlO ~ 4x8.. 5 M M4xlO 5x10 &I T _ 8 6x12 I 5.5 P m 7 6 6:5677 M5x10 M5xlO. 6x12 7 M6Q ii 6 % M6x12 8X16 w 8 M M6x12 8X16 ~. 8 M M6x16 8x16 _ 76G iit M8 8_ _ 14 M8 M8X16 10x20 18 _. Ml Ml MlOx16 ; i 12x24. i8 Ml0 12 _~_ Ml0 I MlOx20 il..l 12x24 20 M12 14 Ml oni I wp 16 ~_ 8.3 ~ _ M12x25 / 16x30 20 Ml2 16 Ml2. 17 p M12x25 16x30 20 Ml2 IS Ml ,3 ~: 18 M12x30 ~ 16x M Ml M12x30 16x32 p p 20 M Mi2_ M12x35 16x32 20 Ml2 it R~R 1 T% 2O 18. M12x35 ~ 16x32 I26 I%16 /&+% <O 20x40 Note Retaining screw and jacking screws are meant for machine tool applications also. i *Dimensions for countersinks and counterbores. 20x40 25x40 ~ 25x50 TRetaining screw: cheese head screw conforming to IS : Specification for slotted cheese head screws ( second revision ) or hexagon socket head cap screw conforming to IS : Specification for hexagon socket head cap screws (second revision ). IDowel sleeve conforming to IS : I Specification for spring dowel sleeves ( light and heavy patterns ) for use in foundries. 4

8 IS:2048;1883 TABLE3 DIMENSIONS FORKEYWAYS (Clause 3.2) All dimensions In millimetres. SECTiON XX DETAIL AT A Tol on b h TOl 1. TOI on an Running fit Light drive flt Force fit t, ta Shaft Hub Shaft Hub ShaftandHub H9 DlO N9 Js9 P9 _%_ 8 2x2 2 +0'025 0'004 f _ 1'2 1'0 0'08 0'16 s!o 3x '029 0'0125 ~ x4 4 +0' x5 _ 5 +ro30 +0'030 0'030 Keyway Keyway for Machine Tools Application on 0" 1, f xs, '036 _ ~ x8 /1p 44 _50_ 14x9 14 f0'120 _ X $ x x _85_ 22x ,149 0 ss_93_ 25x ' p x16 28 y +:'06, ' '026 13'0 +0'050 0'062 0' '0, 10' _ 1' _ 440 ~ 90x45. I _ 90 +0' ! x ;:::;: 1 ;.,,87 ;:;:;; z

9 IS : TABLE 4 PREFERRED LENGTH AND wmm 0F KEYS ( Chose 3.3 ) Preferred Length Key(bxh),mm (')mm 1 2x2 / 3x3 1 4x4 ) 5x5 ) '6x6 i 6x7 / 10x6 / '2x8 /,4x9 ),6X,0 j 18x.U 1 *0X,2 ) 22x14 / 26x14 I.*BXl6 1 32x18 / 36x x22 / 45x25 / 50x28! 66x32 163x32 j 70x x40 1; I, I *Weight for Keys Type B,kgltWO Pieces ( APPW. ) E? ' NoteFor machine toolsappllcation for keys (bxh ),4x410 40x22 preferred length (/) ranges from IO to 250. *For calculations of weights, density of steel taken as 7'85 o/cm'. 6

10 ls: Tolerances on Length of Keys and Keyways Length of Key mm Tolerance on Key Length Keyway Length mm mm Up to to and above Error of Symmetry and Parallelism Diameter of Above Shaft b X ( ThrMkterial of Key Steel of tensile strength not less than 600 MPa shall be used as material 8. Packing 8.1 Packages shall be made in such a way that keys are protected against mechanical damage in transit. 9. Marking 9.1 Such marks as may be specified by the purchaser shall be marked on the top or bottom surface of the parallel keys or in the packaging containing keys. 9.2 Cerfificafion Marking Details available with the Bureau of Indian Standards, EXPLANATORY NOTE parallel keys and keyways were formerly covered in IS: Specification for parallel keys and keyways ( first revision 1. However, parallel keys and keyways meant for machine tools were covered in IS : Specification for parallel keys and keyways for machine tools ( first revision ). The dimensions and tolerances of keys of sizes 4 x 4 to 40 X 22 covered in IS: were exactly the same as those covered in IS : which specification was applicable to machine tools. Only the range of key lengths and dimensions of keyways differed for machine tool applications. ln the present revision of IS : 2048, the requirements of keys for machine tools including the range of key lengths and details of keyway have been incorporated. In addition, the original range of sizes 2 x 2 to 100 x 50 as also the types A to J have been retained. This version of the standard ( IS : ) shall supersede IS : after its publications. 7 Printed at Simco Printing Press, Delhi, India

11 AMENJMENT NO. 1 SEPTEMBER 1986 TO IS: SPECIFICATION FOR PARALLEL KEYS ANI KEYWAYS (Second Revision) (Azge 7, czause 6) Delete clause 6 along with figure ard informal table. (EDC 44) Printed at Simco Printing Press. Delhi. lndla

12 AMENDMENT NO. 2 OCTOBER 2005 TO IS 2048:1983 SPECIFICATION FOR PARALLEL KEYS AND KEYWAYS (Second Rev&ion) [ Page 7, clause 6 (see also Amendment No. 1 ) ] Insertthe following new clause 6 after 5: 6 ERROR OF SYMMETRY AND PARALLELISM ba Diameter of Above Shaft up to b Y (PG30) Reprography Unit, BIS, New Delhi, India