《BS-856-1969.pdf》由会员分享，可在线阅读，更多相关《BS-856-1969.pdf（14页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 856:1969 Incorporating Amendment No. 1 Specification for Wing nuts Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 856:1969 This British Standard, having been approved by the Mechanical E
2、ngineering Industry Standards Committee, was published under the authority of the Executive Board on 19 May 1969 BSI 08-1999 First published June 1939 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
3、68/23420 ISBN 580 05299 0 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offi
4、ces Technical CommitteeInstitution of Civil Engineers Association of Consulting EngineersInstitution of Gas Engineers Association of Mining Electrical and Institution of Heating and Ventilating Mechanical EngineersEngineers Board of TradeInstitution of Mechanical Engineers British Chemical Plant Man
5、ufacturersInstitution of Mechanical Engineers Association(Automobile Division) British Compressed Air SocietyInstitution of Production Engineers* British Electrical and Allied ManufacturersLocomotive and Allied Manufacturers Association*Association of Great Britain* British Gear Manufacturers Associ
6、ationLondon Transport Board British Internal Combustion EngineMachine Tool Trades Association Manufacturers AssociationMinistry of Defence British Mechanical Engineering FederationMinistry of Defence, Army Department British Pump Manufacturers AssociationMinistry of Power British Steel Industry*Mini
7、stry of Public Building and Works Crown Agents for Oversea Governments andMinistry of Technology AdministrationsMinistry of Technology National Department of Employment and ProductivityEngineering Laboratory* Electricity Council, the Central ElectricityMinistry of Transport Generating Board and the
8、Area Boards inNational Coal Board* England and Wales*National Physical Laboratory (Ministry of Engineering Equipment Users Association*Technology) Gas CouncilRadio Industry Council Institute of Marine EngineersRoyal Institute of British Architects The Government departments and scientific and indust
9、rial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Hydraulic EquipmentPost Office ManufacturersPrecision Bolt and Nut Institute British Bolt, Nut
10、, Screw and Rivet FederationRolled Thread Screw Association British Railways BoardScientific Instrument Manufacturers British Constructional Steelwork AssociationAssociation British Cycle and Motor Cycle IndustriesSociety of Motor Manufacturers and Traders Association Ltd.Ltd. Council of British Man
11、ufacturers of PetroleumTelecommunication Engineering and EquipmentManufacturing Association Electronic Engineering AssociationWasher Manufacturers Association of Fasteners and Turned Parts InstituteGreat Britain Institute of Iron and Steel Wire ManufacturersIndividual manufacturers Ministry of Defen
12、ce, Navy Department Amendments issued since publication Amd. No.Date of issueComments 5554September 1988 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 856:1969 BSI 08-
13、1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Material1 3Finish1 4Nominal dimensions1 5Screw threads1 6Countersinking of bearing face2 7Designation for enquiry and ordering purposes5 Appendix A BSI policy statement on screw threads and the metric system6 Append
14、ix B Related British Standards6 Table 1 Nominal dimensions for hot stamped or cast wing nuts types HS and DC2 Table 2 Nominal dimensions for cold forged wing nuts type CF4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy
15、, (c) BSI BS 856:1969 ii BSI 08-1999 Foreword This standard makes reference to the following British Standards: BS 21, Pipe threads. BS 84, Parallel screw threads of Whitworth form. BS 93, British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A. BS 1580, Unified screw thr
16、eads. BS 3382, Electroplated coatings on threaded components. BS 3643, ISO metric screw threads. This revised British Standard has been prepared, under the authority of the Mechanical Engineering Industry Standards Committee, to supersede BS 856:1939, as a result of the decision taken to adopt the I
17、SO metric screw thread system in the United Kingdom (see Appendix A). Prior to preparing 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) threa
18、ded wing nuts, as BS 856:1939 referred only to BSW, BSF and BA threaded products. Accordingly 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 geo
19、metry of wing nuts established by BS 856:1939 which was of course based on inch modules 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,
20、avoid unnecessary retooling and expense within British industry. References to the obsolescent 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 h
21、ave been allocated in this standard: “Type HS” for hot stamped products. “Type DC” for 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 Typ
22、e CF to the dimensions of Table 2. NOTE 1Table 1 and Table 2 have been subdivided and 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 Stand
23、ards. A British Standard does not purport to include all the necessary provisions of a 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 comp
24、rises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back 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. Licensed Copy: Londo
25、n South Bank University, London South Bank University, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 856:1969 BSI 08-19991 1 Scope 1.1 This British Standard specifies requirements for wing nuts having ISO metric, ISO inch (Unified), BSW1), BSF1) and BA1) screw threads. 1.2 Nomina
26、l 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 non-ferrous stampings or die castings, malleable iron castings, or hot steel
27、 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 Clause 7 for information concerning designation for enquiry or ordering purposes.
28、 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 the wing nuts to be coated he shall state the coating required in his en
29、quiry and order. It is recommended that the coating should comply with the appropriate part of BS 33822). 4 Nominal dimensions The nominal dimensions for wing nuts shall be as given in Table 1 or Table 2 and Clauses 5 and 6. 5 Screw threads 5.1 General. The form of thread, diameters and associated p
30、itches and tolerances shall be in accordance with 5.2 to 5.5. 5.2 ISO metric. The screw threads shall be the coarse pitch series to tolerance class 6H (medium fit) as specified in BS 3643-23). 5.3 ISO inch (Unified). The screw threads shall be UNC or UNF to Class 2B as specified in BS 15804). 5.4 Wh
31、itworth form. The screw threads shall be BSW or BSF to the Normal class as specified in BS 845). 5.5 BA. The screw threads shall be as specified in BS 936). 1) BSW, BSF and BA screw threads have been rendered obsolescent. See Appendix A. Wing nutDiameter range Blank geometry shown in Type designatio
32、n Product descriptionISO metric UNC UNF BSWa BSFa BAa Table 1 HSHot stamped M3 to M18 No. 3 to # in( in to # in5 BA to 0 BA DCCast Table 2CFCold forgedM3 to M20 a BSW, BSF and BA screw threads have been rendered obsolescent. See Appendix A. 2) BS 3382, “Electroplated coatings on threaded components”
33、 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) components” Part 5: “Tin on copper and copper alloy (including brass) components
34、” Part 6: “Silver on copper and copper alloy (including brass) components” Part 7: “Thicker platings for threaded components”. 3) BS 3643, “ISO metric screw threads” Part 2: “Specification for selected limits of size”. 4) BS 1580, “Unified screw threads” Parts 1 and 2: “Diameters ! in and larger” Pa
35、rt 3: “Diameters below ! in”. 5) BS 84, “Parallel screw threads of Whitworth form” (obsolescent). 6) BS 93, “British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A.” (obsolescent). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:4
36、4:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 856:1969 2 BSI 08-1999 6 Countersinking of bearing face Wing nuts shall be countersunk on the bearing face at an included angle of 90120 slightly to exceed the major diameter of the thread. Table 1 Nominal dimensions for hot stamped or cast wing nut
37、s types HS and DC NOTEDotted outline illustrates alternative wing shape permissible. Exercise of this option would render dimension F redundant. 1234567891011 Blank No.a Nominal screw thread size ABCISO metricUNC UNF BSWb BSFb BAb mminmminmmin 1M3No. 4 & No. 6 1/8 in 5 & 49 11/32 6.5 1/4 7 9/32 2M4
38、& M5No. 8 & No. 10 3/16 in 3 & 210 13/32 8 5/16 9 11/32 3M6 No. 12 & 1/4 in1/4 in 1 & 013 1/2 9.5 3/8 11 7/16 4M8 5/16 in5/16 in 16 5/8 12 15/32 13 1/2 5M10 3/8 in3/8 in 17.5 11/16 14 9/16 14 9/16 6M12 7/16 in7/16 in 19 3/4 16 5/8 15 19/32 7(M14) 1/2 in1/2 in 22 7/8 17.5 11/16 17 21/32 8M16 5/8 in5/
39、8 in 25.5120.5 13/16 19 3/4 9(M18) 3/4 in3/4 in 32 11/4 27 11/16 22 7/8 NOTESizes shown in brackets are non-preferred. a The numbers given in Column 1 are the customary trade designations for the sizes of the nut blanks, which are common for Type HS and Type DC wing nuts. The values of the metric di
40、mensions given are arithmetic conversions of the basic inch dimensions, rounded-off to the nearest 0.5 mm. b BSW, BSF and BA threads have been rendered obsolescent and these threads should not be used for new designs (see Appendix A). Licensed Copy: London South Bank University, London South Bank Un
41、iversity, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 856:1969 BSI 08-19993 Table 1 Nominal dimensions for hot stamped or cast wing nuts types HS and DC 121314151617181920212223 DEFGHJ mminmminmminmminmminmmin 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 25.5119
42、 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 2.5 3/32 1.5 1/16 23 29/32 38 11/2 19 3/4 6.5 1/4 3 1/8 2.5 3/32 25.5144.5 13/4 19 3/4 7 9/32 5 3/16 3 1/8 28.5 11/8 51225.518 5/16 5 3/16 3 1/8 32 11/4 59 25/16 25.519.5 3/8 5.5 7/32 4 5/32 36.5 17/16 63.5 21/2 32 11/4 10 13/32 6.5 1/4 5
43、 3/16 41 15/8 78 31/16 32 11/4 12 15/32 7 9/32 5.5 7/32 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 856:1969 4 BSI 08-1999 Table 2 Nominal dimensions for cold forged wing nuts type CF 123456789 Blank No.
44、a Nominal screw thread size ABISO metricUNC UNF BSWb BSFb BAb mminmmin 1M3No. 4 & No. 6 1/8 in 5 & 48 5/16 5 13/64 2M4 & M5No. 8 & No. 10 3/16 3 & 211 27/64 6 15/64 3M6 No. 12 & 1/4 in 1/4 in 1 & 012 31/64 8 5/16 4M8 5/16 in5/16 in 14 9/16 9.5 3/8 5M10 3/8 in3/8 in 17 43/64 12 15/32 6M12 7/16 in & 1
45、/2 in7/16 in & 1/2 in 22 7/8 16 5/8 8M16 & M20 5/8 in & 3/4 in5/8 in & 3/4 in 29.5 15/32 22 7/8 a The numbers given in Column 1 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, rou
46、nded-off to the nearest 0.5 mm. b BSW, BSF and BA threads have been rendered obsolescent and these threads should not be used for new designs (see Appendix A). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 01:44:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
47、 856:1969 BSI 08-19995 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 the purpose of an enquiry or order the following information shall be given: 1) Material and product descrip
48、tion, 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. BS 856. 5) Machining of bearing face (if required) (see 3.2). 6) Coating (if required). 7.2 Examples 1) “Brass
49、 wing nuts Type HS M6 to BS 856, with machined bearing face”. 2) “Steel wing nuts Type CF !-UNC to BS 856, zinc plated to BS 3382-2. 7.3 Special requirements. Special requirements such as nuts threaded with 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. 101112131415161718192021 CDEGHJ mminmminmminmminmminmmin 3 1/8 9 11/32 16.5 21/32 5 13/64 2.5 3/32 1 3/64 4.5 11/64 11 7/16 21.5 27/32 7 17