1、BSI BS*7794 95 Lb24669 0534884 299 BRITISH STANDARD Specification for Square-drive sockets, driving squares and accessories for power-driven socket wrenches UDC: 621.883.14;.16 BS 7794 : 1995 BSI BS*7794 95 = lb24bb 0514885 125 BS 7794 : 1995 This British Standard, having been prepared under the dir
2、ection of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1995 O BSI 1995 The following BSI references relate to the work on this standard: Committee reference MTE15 Draft for comment 93/706844 DC ISBN O 580 24286 4 Committe
3、es responsible for this British Standard The preparation of this British Standard was entrusted to Echnical Committee MTE/15, Hand tools, upon which the following bodies were represented: British Coal Corporation British Elecommunications plc Consumer Policy Committee of BSI Federation of British Ha
4、nd Tool Manufacturerc Handle Manufacturers Association Institute of Carpenters Institute of Trading Standards Administration Ministry of Defence Coopted members Amendments issued since publication Amd. No. Date Ext affected BSI BSa7774 75 3624667 0534886 Ob3 BS 7794 : 1995 Contents m!e Committees re
5、sponsible Inside front cover Foreword iii Specification 1 Scope 1 2 References 1 3 Definitions 1 4 Materials 1 5 Hardness 1 6 Design and manufacture 1 7 Finish 1 8 Dimensions and tolerances 1 9 Designation and marking 1 Annexes A (normative) Power-driven square-drive sockets and accessories for the
6、Unified inch series of bolts, nuts and machine screws 14 B (normative) Power-driven square-drive sockets and accessories for 21 C (informative) Notes on safe usage of power-driven sockets and accessories 27 D (informative) Retaining devices 28 BSW, BSF and BA bolts, nuts and machine screws (obsolesc
7、ent) Tables 1 Male driving squares 2 Female driving squares 3 4 5 6 7 8 9 Power square-drive converters 10 Power square-drive extensions 11 Power square-drive universal joints A.l Hexagon sockets with i in (6.3 mm) square drive: Unified (inch) hexagons A.2 Hexagon sockets with i in (10 mm) square dr
8、ive: Unified (inch) hexagons A.3 Hexagon sockets with f in (12.5 mm) square drive: Unified (inch) hexagons A.4 Hexagon sockets with in (20 mm) square drive: Unified (inch) hexagons A.5 Hexagon sockets with 1 in (25 mm) square drive: Unified (inch) hexagons A.6 Hexagon sockets with if in (40 mm) squa
9、re drive: Unified (inch) hexagons B. 1 Hexagon sockets with i in (6.3 mm) square drive: BSF, BSW and large Whitworth hexagons B.2 Hexagon sockets with a in (6.3 mm) square drive: BA hexagons Hexagon sockets with 6.3 mm square drive Hexagon sockets with 10 mm square drive Hexagon sockets with 12.5 mm
10、 square drive Hexagon sockets with 20 mm square drive Hexagon sockets with 25 mm square drive Hexagon sockets with 40 mm square drive 3 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 22 23 i BSI BSX94 95 Lb24bb 0534887 TT8 M BS 7794 : 1995 B.3 B.4 B.5 B.6 Page Hexagon sockets with f in (10 mm) square dri
11、ve: BSF, BSW and large Whitworth hexagons 24 Hexagon sockets with f in (12.5 mm) square drive: BSF, BSW and large Whitworth hexagons 25 Hexagon sockets with f in (20 mm) square drive: BSF, BSW and large Whitworth hexagons 26 Hexagon sockets with 1 in (25 mm) square drive: BSF, BSW and large Whitwort
12、h hexagons 27 Figures 1 2 3 4 5 6 7 8 9 10 11 A. 1 A.2 A.3 A. 4 A.5 A. 6 B. 1 B.2 B.3 B.4 B.5 B.6 D. 1 Male driving squares Female driving squares Hexagon sockets with 6.3 mm square drive Hexagon sockets with 10 mm square drive Hexagon sockets with 12.5 mm square drive Hexagon sockets with 20 mm squ
13、are drive Hexagon sockets with 25 mm square drive Hexagon sockets with 40 mm square drive Power square-drive converters Power square-drive extensions Power square-drive universal joints Hexagon sockets with f in (6.3 mm) square drive: Unified (inch) hexagons Hexagon sockets with i in (10 mm) square
14、drive: Unified (inch) hexagons Hexagon sockets with f in (12.5 mm) square drive: Unified (inch) hexagons Hexagon sockets with i in (20 mm) square drive: Unified (inch) hexagons Hexagon sockets with 1 in (25 mm) square drive: Unified (inch) hexagons Hexagon sockets with if in (40 mm) square drive: Un
15、ified (inch) hexagons Hexagon sockets with i in (6.3 mm) square drive: BSF, BSW and large Whitworth hexagons Hexagon sockets with i in (6.3 mm) square drive: BA hexagons Hexagon sockets with i in (10 mm) square drive: BSF, BSW and large Whitworth hexagons Hexagon sockets with i in (12.5 mm) square d
16、rive: BSF, BSW and large Whitworth hexagons Hexagon sockets with i in (20 mm) square drive: BSF, BSW and large Whitworth hexagons Hexagon sockets with 1 in (25 mm) square drive: BSF, BSW and large Whitworth hexagons 3 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 22 23 24 25 26 27 Retaining devices 28 v
17、 List of references Inside back cover BSI BS67794 95 = Lb24bb9 0514888 934 BS 7794 : 1995 Foreword This British Standard has been prepared by Technical Committee MTE/15. In this standard, six sizes of male and female square drives are given, for use with power-driven socket wrenches of the following
18、 series: metric Unified (inch) BSF and BSW Whitworth large Compliance with a British Standard does not of itself confer immunity from legal obligations. . 111 BSI BSx7774 95 Lb24669 05L4889 870 BS 7794 : 1995 Specification 1 Scope This British Standard specifies design and dimensional requirements f
19、or the following components of power-driven socket wrenches: a) square-drive sockets for metric bolts, nuts and machine screws specified in: BS 3692 : 1967, BS 4183 : 1967, BS 4190 : 1967, BS 4395 : Parts 1 and 2 : 1969, BS 4929 : 1973; b) driving squares; e) accessories: square-drive converters, ex
20、tensions and universal joints. The dimensional requirements for comparable sockets for the inch series of bolts, nuts and machine screws are specified in annexes A and B. Annex C gives notes on the safe usage of power-driven sockets and accessories, and annex D describes two types of retaining devic
21、e. 2 References 2.1 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated referenc
22、es, only the edition cited applies: any subsequent amendments to or revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amend
23、ments. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definiti
24、ons For the purposes of this British Standard, the following definitions apply. 3.1 socket wrench A wrench consisting of the assembly of a socket with its driving components, designed solely for the purpose of applying a torque to screwed fasteners with hexagonal, bi-hexagonal or square heads. 3.2 s
25、ocket A steel component of cylindrical form having at one end a female form to suit the head of a screwed fastener and at the other end a female driven square for receipt of the male square on a driving component. 3.3 drive An arrangement whereby a male driving square fits into a female driven squar
26、e in such a manner that abutment between the surfaces on the male square and corresponding surfaces in the female square prevents either member from rotating separately and enables torque applied to one member to be transmitted to the other member. 3.4 bi-hexagon Two internal hexagons formed coaxial
27、ly at 30 radial displacement to each other. 3.5 bi-square Two internal squares formed coaxially at 45 radial displacement to each other. 4 Materials Sockets, driving squares and accessories shall be manufactured from chrome alloy steel. 5 Hardness Sockets not exceeding 65 mm nominal size, and access
28、ories, shall have hardness values within the range 39 HRC to 46 HRC inclusive. See BS 891 : 1989. Sockets larger than 65 mm nominal size shall have hardness values within the range 35 HRC to 42 HRC inclusive. See BS 891 : 1989. 6 Design and manufacture 6.1 The sockets and all accessories shall be fr
29、ee from cracks, burrs, flashes, scale and other deleterious defects. 6.2 The outer end of the hexagon, bi-hexagon or bi-square opening shall be slightly chamfered at a 120 inclusive angle from the across-corners dimension to facilitate engagement onto the fastener. 7 Finish Any protective finish sha
30、ll, where applicable, conform to the appropriate British Standard. Chrome plating or nickel plating shall not be used. 8 Dimensions and tolerances The dimensions and tolerances of sockets, driving squares and accessories shall be as specified in tables 1 to 11. (See guide table overleaf.) 9 Designat
31、ion and marking Each socket and driving component shall be plainly and indelibly marked with the manufacturers name or trademark. Sockets shall also be marked with the designating size, which shall be the nominal size across flats of the hexagon in millimetres, e.g. 10. 1 BSI BS*94 95 1624669 0514B9
32、0 592 BS 7794 : 1995 Guide to tables for dimensions Nominai size range See table See figure mm Item Male driving squares 6.3 to 63 1 1 16.3 to 63 12 12 Female driving squares Sockets with 6.3 mm square drives 13.2 to 13.0 13 13 I Sockets with 10 mm square drives 17 to 19 14 14 I I I I I Sockets with
33、 12.5 mm square drives I 10 to 27 15 15 I I I Sockets with 20 mm square drives I 19 to 46 16 16 i 17 18 I24 to 80 17 Sockets with 25 mm square drives Sockets with 40 mm square drives I36 to 100 18 I Power square drive converters I 10 to 90 I9 . 19 I 10 11 I lo Power square drive extensions I 10 to 6
34、3 drive size Power square drive universal joints I 10 to 63 drive size 11 BSI BS*779Y 95 Lb24669 05LLiL Li29 W BS 7794 : 1995 P I t E a 3 BSI BSU94 95 = 1624669 0514B92 365 BS 7794 : 1995 CI c 4 BSI BS*?94 95 Lb24bb 0514693 2Tl BS 7794 : 1995 t min. al dl d.2 Figure 3. Hexagon sockets with 6.3 mm sq
35、uare drive 1 dl d2 max. max . max. mble 3. Hexagon sockets with 6.3 mm square drive wts s Nominal I min. I max. 3.2 I 3.22 I 3.33 I 4.0 I 4.02 I 4.15 4.5 I 4.52 I 4.65 5.0 I 5.02 I 5.15 I 5.5 I 5.52 I 5.65 6.0 1 6.03 I 6.18 7.0 I 7.03 I 7.18 8.0 I 8.03 I 8.18 9.0 I 9.03 1 9.18 I10.0 110.04 110.24 11
36、1.0 111.04 111.24 12.0 112.04 112.30 13.0 113.04 113.30 I l4 I 25 1.3 , I 6.8 1.7 I 7.8 I 14 I25 I l4 I 25 1.9 I 8.5 2.1 I 9.1 I14 I25 2.3 I 9.7 I14 125 1 2.6 110.3 I l4 I 25 3.0 111.6 I14 I25 3.5 112.8 I14 I25 1 I l6 I 4.0 I 14.1 4.4 115.3 116 I 25 4.9 116.6 116 I25 1 I 25 I25 5.3 117.8 I l6 5.8 I
37、19.1 I16 NOTE. A hole for the retaining device through one face only is optional. 5 BS 7794 : 1995 BSI BS*794 95 = 1624hb9 0514894 138 1 :“I a) d, dz Figure 6. Hexagon sockets with 20 mm square drive d2 max. 1 I max. I 48 48 120 120.06 120.46 I 9.0 134.8 21 121.06 121.46 I 9.8 136.1 22 122.06 122.46
38、 I 9.9 137.3 48 51 I 48 123 123.06 123.46 110.4 138.6 48 24 124.06 124.46 111.2 139.8 25 125.06 125.46 111.3 141.1 48 51 I 48 48 26 126.08 126.58 111.8 142.3 27 127.08 127.58 112.6 143.6 48 55 I I I I I 28 128.08 I 28.58 112.7 144.8 48 48 58 57 I 58 34 134.10 I 34.70 115.4 152.3 36 136.10 136.70 116
39、.8 154.8 58 58 57 I I I I l 38 138.10 133.70 117.3 157.3 58 58 41 141.10 141.70 118.9 161.1 46 146.10 146.70 I21 167.3 58 8 BSI BSX7794 95 3624669 0534897 947 BS 7794 : 1995 Across-flats s Nominal I min. max. t min. I 4 dl dz %ble A.3 Hexagon sockets with in (12.5 mm) square drive: Unified (inch) he
40、xagons 1 Across-flats s It Nominal in max. I mm dl max. mm d2 max. mm 3 8 I 9.55 I 9.67 I 4.2 I 17.1 I 28 - I6 111.15 111.35 I 4.9 I 19.1 128 I I I I I I 2 112.74 113.00 I 5.6 121.1 28 114.34 114.64 I 6.4 123.0 I 28 8 115.92 116.22 I 7.1 125.0 I 37 - II 117.51 117.86 I 7.8 127.0 I37 1 li 3 4 119.11
41、119.51 I 8.6 129.0 I37 I 20.70 121.10 I 9.3 131.0 I 37 L3 16 n 122.29 122.69 110.0 133.0 I 37 - 1 li li 123.87 124.27 110.8 135.0 I37 1 125.46 125.86 111.5 137.0 I 37 1; 127.07 127.57 112.2 138.9 I37 NCYiE. A hole for the retaining device through one face only is optional I l max. mm I 40 I 40 I 40
42、I 40 I 40 I 45 I 17 BSI BSx779i.r 95 Lb24bb9 0534906 7BT BS 7794 : 1995 a) di d, Figure A.4 Hexagon sockets with -4 in (20 mm) square drive: Unified (inch) hexagons lhble A.4 Hexagon sockets with -4 in (20 nun) square drive: Unified (inch) hexagons I Across-flats s It I dl 1 max. mm Nominal in min.
43、mm max. I mm max. mm 9 4 19.11 I 51 I51 19.51 1 8.6 133.7 I 48 21.10 I 9.3 135.7 I48 13 Ici - 20.70 22.29 I 22,69 110.0 137.7 I48 I51 I 16 16 - 23.87 24.27 110.8 139.7 I48 I51 I 1 25.46 25.86 111.5 141.7 I48 I54 I 27.07 27.57 112.2 143.6 I48 I57 I I 57 I 57 29.16 112.9 145.6 I 48 32.33 114.4 149.6 I
44、58 28.66 31.83 33.44 34.04 I 15.1 150.6 I58 I57 I 36.61 I 60 60 38.80 17.3 57.5 58 41.98 18.8 61.5 58 65 I 58 37.21 116.6 1 54.5 38.20 41.38 42.96 43.56 I 19.5 163.5 I58 I65 I 46.14 46.74 121.0 167.5 I58 I70 I BSI BSU7794 95 lb24bb9 0534907 bLb = BS 7794 : 1995 I max. C) di = 6 4 di 6 Figure A.5 Hex
45、agon sockets with 1 in (25 mm) square drive: Unified (inch) hexagons able A.5 Hexagon sockets with 1 in (25 mm) square drive: Unified (inch) hexagons i Across-flats s 1 max. mm dl max. mm d2 max. mm Nominal in min. I mm min. mm 7 122.29 16 18 123.87 I 65 I 65 I 58 I 40.7 24.27 110.8 I 42.7 I 58 22.6
46、9 I lo 1 125.46 I 58 I 65 25.86 111.5 I 44.7 27.57 112.2 I 46.7 I 58 I 65 127.07 i$ 128.66 29.16 112.9 I 48.7 I58 I 65 1 1; 131.83 32.33 114.4 I 52.6 I58 I 65 1 15 16 133.44 1; 136.61 I 65 I 65 I 34.04 I 15.1 I 54.6 37.21 116.6 I 58.6 I 58 1: 138.20 38.80 117.3 I 60.5 I58 I 65 1 1 141.38 41.98 118.8
47、 I 64.5 I 68 I 75 1 li 16 142.96 1; 146.14 I 75 I 80 I 68 43.56 119.5 I 66.5 46.74 121.0 I 70.5 I 68 1; 147.73 48.33 121.7 I 72.4 I 68 I 80 1 2 150.90 51.50 123.2 I 76.4 168 I 80 1 2$ 152.49 53.09 123.9 I 78.4 I 68 I 80 1 2; 154.10 21 16 I 55.68 I I 90 I 68 54.90 124.6 I 80.4 56.48 125.4 I 82.4 I 68
48、 8 I 1 2: 157.27 58.07 126.1 I 84.3 I 68 I 90 1 2; 160.45 2; 163.62 I I 90 I 68 61.25 127.5 I 88.3 64.42 129.0 I 92.3 I 84 I I I 1 66.01 129.7 I 94.3 I 84 I 95 2; 165.21 2- 166.80 22 169.97 I 95 I 95 I 84 67.60 130.5 I 96.2 70.77 131.9 I103 I 84 I I I 1 75.76 134.1 Il10 1 84 1100 2; 174.76 3; 1 79.5
49、3 80.53 136.3 I114 I84 1100 1 19 BSI BSx7794 95 m Lb2Ybb9 05L4908 552 m BS 7794 : 1995 Nominal in 2; a) 4 dz min. max . mm mm 65.21 66.01 lble A.6 Hexagon sockets with 1; in (a0 mm) square drive: Unified (inch) hexagons 33.4 110.5 105 34.1 112.5 105 140 140 I I 2: 169.97 170.77 3- 16 81.11 3; 82.70 2; 173.18 174.18 82.11 83.70 2; 1 74.76 175.76 3 176.35 177.35 39.2 129 105 40.7 133 105 140 140 39 185.88 186.88 3; 189.05 190.05 3: 192.23 193.23 I 32 195.40 196.40 3; I 98.58 198.68 t min. mm dl max. mm d2 max . mm 1 max . mm 29.7 1100.5 I105 1100 I 34.9 111
