1、BRITISH STANDARD BS856:1969 Incorporating Amendment No.1 Specification for Wing nutsBS856:1969 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee,was published underthe authorityof the Executive Boardon 19 May1969 BSI 08-1999 First published June 193
2、9 First revision May 1969 The following BSI references relate to the work on this standard: Committee references MEE/60 and MEE/60/2 Draft for comment 68/23420 ISBN 580 05299 0 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British St
3、andard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Institution of Civil Engineers Association of Consulting Engineers Institution of Gas Engineers Association of Mining Electri
4、cal and Institution of Heating and Ventilating Mechanical Engineers Engineers Board of Trade Institution of Mechanical Engineers British Chemical Plant Manufacturers Institution of Mechanical Engineers Association (Automobile Division) British Compressed Air Society Institution of Production Enginee
5、rs* British Electrical and Allied Manufacturers Locomotive and Allied Manufacturers Association* Association of Great Britain* British Gear Manufacturers Association London Transport Board British Internal Combustion Engine Machine Tool Trades Association Manufacturers Association Ministry of Defenc
6、e British Mechanical Engineering Federation Ministry of Defence, Army Department British Pump Manufacturers Association Ministry of Power British Steel Industry* Ministry of Public Building and Works Crown Agents for Oversea Governments and Ministry of Technology Administrations Ministry of Technolo
7、gy National Department of Employment and Productivity Engineering Laboratory* Electricity Council, the Central Electricity Ministry of Transport Generating Board and the Area Boards in National Coal Board* England and Wales* National Physical Laboratory (Ministry of Engineering Equipment Users Assoc
8、iation* Technology) Gas Council Radio Industry Council Institute of Marine Engineers Royal Institute of British Architects The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the c
9、ommittee entrusted with the preparation of this British Standard: Association of Hydraulic Equipment Post Office Manufacturers Precision Bolt and Nut Institute British Bolt, Nut, Screw and Rivet Federation Rolled Thread Screw Association British Railways Board Scientific Instrument Manufacturers Bri
10、tish Constructional Steelwork Association Association British Cycle and Motor Cycle Industries Society of Motor Manufacturers and Traders Association Ltd. Ltd. Council of British Manufacturers of Petroleum Telecommunication Engineering and Equipment Manufacturing Association Electronic Engineering A
11、ssociation Washer Manufacturers Association of Fasteners and Turned Parts Institute Great Britain Institute of Iron and Steel Wire Manufacturers Individual manufacturers Ministry of Defence, Navy Department Amendments issued since publication Amd. No. Date of issue Comments 5554 September 1988 Indic
12、ated by a sideline in the marginBS856:1969 BSI 08-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Material 1 3 Finish 1 4 Nominal dimensions 1 5 Screw threads 1 6 Countersinking of bearing face 2 7 Designation for enquiry and ordering purposes 5 Appendix A
13、BSI policy statement on screw threads and the metric system 6 Appendix B Related British Standards 6 Table 1 Nominal dimensions for hot stamped or cast wing nutstypesHSandDC 2 Table 2 Nominal dimensions for cold forged wing nuts type CF 4BS856:1969 ii BSI 08-1999 Foreword This standard makes referen
14、ce to the following British Standards: BS21, Pipe threads. BS84, Parallel screw threads of Whitworth form. BS93, British Association (B.A.) screw threads with tolerances for sizes0B.A. to16B.A. BS1580, Unified screw threads. BS3382, Electroplated coatings on threaded components. BS3643, ISO metric s
15、crew threads. This revised British Standard has been prepared, under the authority of the Mechanical Engineering Industry Standards Committee, to supersede BS856:1939, as a result of the decision taken to adopt the ISO metric screw thread system in the United Kingdom (see Appendix A). Prior to prepa
16、ring this revision initial consideration was given to preparing a completely new and separate specification based on purely metric concepts and modules of measurement, to cover ISO metric and ISO inch (Unified) threaded wing nuts, as BS856:1939 referred only to BSW, BSF and BA threaded products. Acc
17、ordingly a review was made of current European specifications covering metric series wing nuts, but, since little conformity was detected, it was decided to maintain (pending any future ISO agreements) the basic geometry of wing nuts established by BS856:1939 which was of course based on inch module
18、s of measurement. This revision thus makes provision for accommodating ISO metric and ISO inch (Unified) screw threads within the currently established wing nut blanks, which, while maintaining interchangeability, avoid unnecessary retooling and expense within British industry. References to the obs
19、olescent BSW, BSF and BA threads have been retained until such time as they become obsolete and can be withdrawn. Wing nuts are basically manufactured by three processes, for which the following type designations have been allocated in this standard: “Type HS” for hot stamped products. “Type DC” for
20、 cast products. “Type CF” for cold forged products. However, only two forms of wing nut blank geometry are incorporated in this specification, Types HS and DC being manufactured to the dimensions of Table 1 and Type CF to the dimensions of Table 2. NOTE 1Table 1 and Table 2 have been subdivided and
21、the metric and inch units are set out alongside each other. It is emphasized that in both tables the metric units are arithmetical conversions of the basic inch units. NOTE 2See Appendix B for related British Standards. A British Standard does not purport to include all the necessary provisions of a
22、 contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi and ii, pages1 to8, an inside back
23、cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS856:1969 BSI 08-1999 1 1 Scope 1.1 This British Standard specifies requirements for wing nuts having ISO met
24、ric, ISO inch (Unified), BSW 1) , BSF 1)and BA 1)screw threads. 1.2 Nominal dimensions for two forms of wing nut blank geometry are specified in the following size ranges: 2 Material 2.1 The wing nuts whose dimensions conform to those given in Table 1 shall be manufactured from hot brass or other no
25、n-ferrous stampings or die castings, malleable iron castings, or hot steel stampings, as may be specified by the purchaser. 2.2 The wing nuts whose dimensions conform to those given in Table 2 shall be manufactured by cold forging steel or brass, as may be specified by the purchaser. NOTESee Clause7
26、 for information concerning designation for enquiry or ordering purposes. 3 Finish 3.1 Wing nuts shall be cleanly finished, sound and free from fins and sharp edges. 3.2 The bearing face of hot stamped or cast wing nuts shall be machined if so required by the purchaser. 3.3 If the purchaser requires
27、 the wing nuts to be coated he shall state the coating required in his enquiry and order. It is recommended that the coating should comply with the appropriate part of BS3382 2) . 4 Nominal dimensions The nominal dimensions for wing nuts shall be as given in Table 1 or Table 2 and Clauses5 and6. 5 S
28、crew threads 5.1 General. The form of thread, diameters and associated pitches and tolerances shall be in accordance with5.2 to5.5. 5.2 ISO metric. The screw threads shall be the coarse pitch series to tolerance class6H (medium fit) as specified in BS3643-2 3) . 5.3 ISO inch (Unified). The screw thr
29、eads shall be UNC or UNF to Class2B as specified in BS1580 4) . 5.4 Whitworth form. The screw threads shall be BSW or BSF to the Normal class as specified in BS84 5) . 5.5 BA. The screw threads shall be as specified in BS93 6) . 1) BSW, BSF and BA screw threads have been rendered obsolescent. See Ap
30、pendix A. Wing nut Diameter range Blank geometry shown in Type designation Product description ISO metric UNC UNF BSW aBSF a BA a Table 1 HS Hot stamped M3to M18 No.3 to# in ( in to# in 5BA to0BA DC Cast Table 2 CF Cold forged M3to M20 a BSW, BSF and BA screw threads have been rendered obsolescent.
31、See Appendix A. 2) BS3382, “Electroplated coatings on threaded components” Part 1: “Cadmium on steel components” Part 2: “Zinc on steel components” Part 3: “Nickel or nickel plus chromium on steel components” Part 4: “Nickel or nickel plus chromium on copper and copper alloy (including brass) compon
32、ents” Part 5: “Tin on copper and copper alloy (including brass) components” Part6:“Silver on copper and copper alloy (including brass) components” Part 7: “Thicker platings for threaded components”. 3) BS3643, “ISO metric screw threads” Part2: “Specification for selected limits of size”. 4) BS1580,
33、“Unified screw threads” Parts 1 and 2: “Diameters ! in and larger” Part 3: “Diameters below ! in”. 5) BS84, “Parallel screw threads of Whitworth form” (obsolescent). 6) BS93, “British Association (B.A.) screw threads with tolerances for sizes0B.A. to16B.A.” (obsolescent).BS856:1969 2 BSI 08-1999 6 C
34、ountersinking of bearing face Wing nuts shall be countersunk on the bearing face at an included angle of90120 slightly to exceed the major diameter of the thread. Table 1 Nominal dimensions for hot stamped or cast wing nuts types HS and DC NOTEDotted outline illustrates alternative wing shape permis
35、sible. Exercise of this option would render dimension F redundant. 1 2 3 4 5 6 7 8 9 10 11 Blank No. a Nominal screw thread size A B C ISO metric UNC UNF BSW bBSF b BA b mm in mm in mm in 1 M3 No.4&No.6 1 / 8 in 5&4 9 11 / 32 6.5 1 / 4 7 9 / 32 2 M4&M5 No.8&No.10 3 / 16in 3&2 10 13 / 32 8 5 / 16 9 1
36、1 / 32 3 M6 No.12& 1 / 4in 1 / 4in 1&0 13 1 / 2 9.5 3 / 8 11 7 / 16 4 M8 5 / 16in 5 / 16in 16 5 / 8 12 15 / 32 13 1 / 2 5 M10 3 / 8in 3 / 8in 17.5 11 / 16 14 9 / 16 14 9 / 16 6 M12 7 / 16in 7 / 16in 19 3 / 4 16 5 / 8 15 19 / 32 7 (M14) 1 / 2in 1 / 2in 22 7 / 8 17.5 11 / 16 17 21 / 32 8 M16 5 / 8in 5
37、 / 8in 25.5 1 20.5 13 / 16 19 3 / 4 9 (M18) 3 / 4in 3 / 4in 32 1 1 / 4 27 1 1 / 16 22 7 / 8 NOTESizes shown in brackets are non-preferred. a The numbers given in Column1 are the customary trade designations for the sizes of the nut blanks, which are common for Type HS and Type DC wing nuts. The valu
38、es of the metric dimensions given are arithmetic conversions of the basic inch dimensions, rounded-off to the nearest0.5mm. b BSW, BSF and BA threads have been rendered obsolescent and these threads should not be used for new designs (see Appendix A).BS856:1969 BSI 08-1999 3 Table 1 Nominal dimensio
39、ns for hot stamped or cast wing nuts types HS and DC 12 13 14 15 16 17 18 19 20 21 22 23 D E F G H J mm in mm in mm in mm in mm in mm in 13.5 17 / 32 22 7 / 8 19 3 / 4 3.5 9 / 64 2.5 3 / 32 1.5 1 / 16 15 19 / 32 25.5 1 19 3 / 4 4 5 / 32 2.5 3 / 32 1.5 1 / 16 18 23 / 32 30 13 / 16 19 3 / 4 5 3 / 16 2
40、.5 3 / 32 1.5 1 / 16 23 29 / 32 38 1 1 / 2 19 3 / 4 6.5 1 / 4 3 1 / 8 2.5 3 / 32 25.5 1 44.5 1 3 / 4 19 3 / 4 7 9 / 32 5 3 / 16 3 1 / 8 28.5 1 1 / 8 51 2 25.5 1 8 5 / 16 5 3 / 16 3 1 / 8 32 1 1 / 4 59 2 5 / 16 25.5 1 9.5 3 / 8 5.5 7 / 32 4 5 / 32 36.5 1 7 / 16 63.5 2 1 / 2 32 1 1 / 4 10 13 / 32 6.5
41、1 / 4 5 3 / 16 41 1 5 / 8 78 3 1 / 16 32 1 1 / 4 12 15 / 32 7 9 / 32 5.5 7 / 32BS856:1969 4 BSI 08-1999 Table 2 Nominal dimensions for cold forged wing nuts type CF 1 2 3 4 5 6 7 8 9 Blank No. a Nominal screw thread size A B ISO metric UNC UNF BSW bBSF b BA b mm in mm in 1 M3 No.4& No.6 1 / 8 in 5&4
42、 8 5 / 16 5 13 / 64 2 M4&M5 No.8& No.10 3 / 16 3&2 11 27 / 64 6 15 / 64 3 M6 No.12& 1 / 4 in 1 / 4 in 1&0 12 31 / 64 8 5 / 16 4 M8 5 / 16in 5 / 16in 14 9 / 16 9.5 3 / 8 5 M10 3 / 8in 3 / 8in 17 43 / 64 12 15 / 32 6 M12 7 / 16in & 1 / 2in 7 / 16in & 1 / 2in 22 7 / 8 16 5 / 8 8 M16&M20 5 / 8in & 3 / 4
43、in 5 / 8in & 3 / 4in 29.5 1 5 / 32 22 7 / 8 a The numbers given in Column1 are the customary trade designations for the sizes of the nut blanks. The values of the metric dimensions given are arithmetic conversions of the basic inch dimensions, rounded-off to the nearest0.5mm. b BSW, BSF and BA threa
44、ds have been rendered obsolescent and these threads should not be used for new designs (see Appendix A).BS856:1969 BSI 08-1999 5 Table 2 Nominal dimensions for cold forged wing nuts type CF 7 Designation for enquiry and ordering purposes 7.1 Information to be given. When designating wing nuts for th
45、e purpose of an enquiry or order the following information shall be given: 1) Material and product description, e.g.“Brass wing nuts”. 2) Type designation, i.e.“Type HS” for hot stamped products, 3) Screw thread size required, e.g.“M6” or “!-UNC”. 4) The number of this British Standard, i.e.BS856. 5
46、) Machining of bearing face (if required) (see3.2). 6) Coating (if required). 7.2 Examples 1) “Brass wing nuts Type HS M6 to BS856, with machined bearing face”. 2) “Steel wing nuts Type CF !-UNC to BS856, zinc plated to BS3382-2. 7.3 Special requirements. Special requirements such as nuts threaded w
47、ith sizes, fits or pitches other than those specified should be clearly set out in any enquiry or order and shall be the subject of agreement between the manufacturer and the purchaser. 10 11 12 13 14 15 16 17 18 19 20 21 C D E G H J mm in mm in mm in mm in mm in mm in 3 1 / 8 9 11 / 32 16.5 21 / 32
48、 5 13 / 64 2.5 3 / 32 1 3 / 64 4.5 11 / 64 11 7 / 16 21.5 27 / 32 7 17 / 64 3 1 / 8 2 5 / 64 5 13 / 64 13 1 / 2 27 1 1 / 16 8 5 / 16 4 5 / 32 2.5 3 / 32 6 15 / 64 16 5 / 8 31 1 7 / 32 9.5 3 / 8 5 3 / 16 3 7 / 64 7 17 / 64 18 23 / 32 36 1 13 / 32 11 7 / 16 5.5 7 / 32 3 1 / 8 9.5 3 / 8 23 29 / 32 47.5
49、 1 7 / 8 15 19 / 32 7.5 19 / 64 4.5 11 / 64 13.5 17 / 32 35 1 3 / 8 68 2 11 / 16 20.5 13 / 16 9.5 3 / 8 5 3 / 16 “Type DC” for cast products. “Type CF” for cold forged products,BS856:1969 6 BSI 08-1999 Appendix A BSI policy statement on screw threads and the metric system The major sectors of British industry were represented at a conference organized by BSI on23rd November,1965. They gave their approval to a policy statement which urged British firms to regard the traditional screw thread systems Whitworth,
