1、BRITISH STANDARD BS 1813:1974 Specification for Dimensions of conduit dies, diestocks and guides UDC 621.315.671:621.643.414:621.992.31BS1813:1974 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee, was published under the authorityof the Executive B
2、oardon 17May1974 BSI 12-1999 First published December1951 First revision May1974 The following BSI references relate to the work on this standard: Committee referenceMEE/1 andMEE/1/20 Draft for comment72/33847 DC ISBN 0 580 08292 X Co-operating organizations The Mechanical Engineering Industry Stand
3、ards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial organizations: The Government department and organization marked with an asterisk in the above list, together with the fol
4、lowing, were directly represented on the committee entrusted with the preparation of this British Standard. Associated Offices Technical Committee Department of Trade and Industry, National Association of Consulting Engineers Engineering Laboratory Association of Hydraulic Equipment Electricity Coun
5、cil, the Central Electricity Manufacturers Ltd Generating Board, and the Area Boards in Association of Mining Electrical and England and Wales Mechanical Engineers Engineering Equipment Users Association British Compressed Air Society Federation of Manufacturers of Construction British Electrical an
6、d Allied Manufacturers Equipment and Cranes Association Institution of Civil Engineers British Gas Corporation Institution of Gas Engineers British Gear Manufacturers Association Institution of Heating and Ventilating British Internal Combustion Engine Engineers Manufacturers Association Institution
7、 of Mechanical Engineers British Mechanical Engineering Confederation Institution of Plant Engineers British Pump Manufacturers Association Institution of Production Engineers British Steel Corporation London Transport Executive* Crown Agents for Oversea Governments and Machine Tool Trades Associati
8、on Administrations Ministry of Defence Department of Employment (HM Factory Ministry of Defence, Army Department Inspectorate) National Coal Board Department of the Environment National Physical Laboratory, Department of Department of Trade and Industry (Marine Trade and Industry* Division) Process
9、Plant Association Department of Trade and Industry, Energy Railway Industries Association of Great Britain Technology Royal Institute of British Architects Department of Trade and Industry, Telecommunication Engineering and Mechanical Engineering Manufacturing Association British Electrical Conduit
10、Systems Association Society of Motor Manufacturers and Traders Electrical Contractors Association (Incorp.) Ltd. Screw Thread Tool Manufacturers Association Individual experts Amendments issued since publication Amd. No. Date of issue CommentsBS1813:1974 BSI 12-1999 i Contents Page Co-operating orga
11、nizations Inside front cover Foreword ii 1 Scope 1 2 Designation and screwing ranges 1 3 Marking 1 4 Nomenclature 1 5 General dimensions 1 6 Finished sizes of guides 1 Appendix A Recommended screwing ranges for BS conduit threadstoBS31,imperial units 5 Appendix B Recommended screwing ranges for “G”
12、designation threadstoBS2779 8 Table 1 Dimensions of BS conduit dies for metric threads 2 Table 2 Dimensions of BS conduit guides for metric threads 3 Table 3 Dimensions of BS conduit stocks for metric threads 4 Table 4 Dimensions of BS conduit dies for inch threads 5 Table 5 Dimensions of BS conduit
13、 guides for inch threads 6 Table 6 Dimensions of BS conduit stocks for inch threads 7 Publications referred to Inside back coverBS1813:1974 ii BSI 12-1999 Foreword This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee in response to a
14、request received from the Cut Thread Screwing Tool Manufacturers Association and the Ground Thread Tap Association. Originally published in1951, this British Standard has been revised as part of the metrication programme and in order that provisions may be made for the metric conduit threads dealt w
15、ith in BS4568, “Steel conduits and fittings with metric threads of ISO form for electrical installations”. The opportunity has also been taken to make provisions for thread diameters of40,50 and63mm as it is foreseen that there will be a requirement for these additional sizes in the future. The impe
16、rial dimensions of BS conduit dies for threads to BS31, “Steel conduit and fittings for electrical wiring” given in the1951 edition of this standard are retained inAppendix A for reference, but these should not be used for new designs as it is anticipated that they will be superseded by the end of19
17、74. InAppendix B, similar provisions are made for conduit dies for screwing fastening threads of “G” designation to BS2779, “Fastening threads of BSP sizes”. NOTEAttention is drawn to the certification facilities offered by BSI; see the inside back cover of this standard. A British Standard does not
18、 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 comprises a front cover, an inside fr
19、ont cover, pagesi andii, pages1to 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.BS1813:1974 BSI 12-1999 1 1 Scope This British Standard pr
20、ovides for three sizes of dies,i.e. small, medium and large, primarily intended for use with steel conduit tubing as specified in BS4568. Principal dimensions are also specified for the corresponding stocks and guides for each type of die. NOTEThe titles of the British Standards referred to in this
21、standard are given on the inside back cover. 2 Designation and screwing ranges The three sizes of dies (and their associated guides and stocks) shall be designated TypeMCS, TypeMCM and TypeMCL respectively and shall be applicable to the following screwing ranges: 3 Marking Dies conforming with this
22、standard shall be markedwith the thread size andBS.CONe.g.M16BS.CON. 4 Nomenclature For the purposes of this standard the nomenclature given inTable 1,Table 2 andTable 3 for the principal features of dies, guides and stocks has been adopted. 5 General dimensions The standard dimensions of dies shall
23、 be as given inTable 1. The standard dimensions of guides shall be as given inTable 2. The standard dimensions of stocks shall be as given inTable 3. 6 Finished sizes of guides When guides are finished by enamelling or other processes, the finished sizes after coating shall not exceed the upper limi
24、ts specified inTable 2. Die Screwing range TypeMCS M16up to and includingM25 BSConduit TypeMCM M25up to and includingM40 BSConduit TypeMCL M50 and M63BS1813:1974 2 BSI 12-1999 Table 1 Dimensions of BS conduit dies for metric threads All dimensions are in millimetres. 1 2 3 4 5 6 7 8 Type Screwing ra
25、nge, BSconduit a A Outside diameter B Thickness C Recess centres D Recess depth R Recess radius Tolerance h12 b Tolerance +0.25 0 Max. Min. Nominal Tolerance +0.20 0 MCS M16 1.5 8g M20 1.5 8g M25 1.5 8g 42.0 12.75 50.9 50.8 5.6 8.0 MCM M25 1.5 8g M32 1.5 8g (M40) 1.5 8g 63.5 15.85 76.3 76.2 7.2 10.5
26、 MCL (M50) 1.5 8g (M63) 1.5 8g 88.9 19.00 101.8 101.6 8.8 13.6 Dimensions in brackets are non-preferred. a BS4568 b BS4500BS1813:1974 BSI 12-1999 3 Table 2 Dimensions of BS conduit guides for metric threads All dimensions are in millimetres. 1 2 3 4 5 6 Type E Outside diameter F Shoulder diameter G
27、Flange thickness H Guide bore Tolerance h12 a Tolerance 0 0.25 Tolerance 0 0.25 Tolerance +0.25 0 For conduit MCS 42.0 35.75 5.55 16.5 16 20.5 20 25.5 25 MCM 63.5 55.60 7.15 25.5 25 32.5 32 40.5 40 MCL 88.9 81.00 7.15 50.5 50 63.5 63 a BS4500BS1813:1974 4 BSI 12-1999 Table 3 Dimensions of BS conduit
28、 stocks for metric threads All dimensions are in millimetres. 1 2 3 4 5 6 7 8 9 10 11 12 Type Die counterbore L M N O P R S Bore for guide Recess centres Recess depth Clamp nut diameter Clamp screw Recess radius Clamp nut recess J Diameter K Depth Max. Min. 0 0.25 0 0.25 Max. Min. Tolerance 0 0.10 (
29、6g) a Tolerance +0.20 0 MCS 42.3 42.1 17.50 36.5 50.9 50.8 5.6 15.8 M6 7.94 5.1 MCM 63.8 63.6 22.25 56.4 76.3 76.2 7.2 20.5 M8 10.32 6.7 MCL 89.2 89.0 24.50 81.8 101.8 101.6 8.8 26.9 M10 13.5 7.5 a BS3643BS1813:1974 BSI 12-1999 5 Appendix A Recommended screwing ranges for BS conduit threads to BS31,
30、 imperial units The dies in this standard are intended for use in the screwing of metric conduit threads toBS4568, but it is recognized that there will be a continuing requirement for dies for BSconduit threads to BS31. The dimensions of dies,Table 4, conduit guides,Table 5 and stocks,Table 6 are th
31、erefore included in this Appendix for information but it should be borne in mind that these will eventually be superseded and should not therefore be used for new designs. Table 4 Dimensions of BS conduit dies for inch threads All dimensions are in inches. 1 2 3 4 5 6 7 8 9 Type Screwing range, BSco
32、nduit a A Outside diameter B Thickness C Recess centres D Recess depth R Recess radius Max. Min. Tolerance +0.010 0 Max. Min. Nominal Tolerance +0.008 0 CS 1 / 2up to and including1 1.656 1.646 1 / 2 2.000 1.995 7 / 23 5 / 16 CM 1 up to and including1 1 / 2 2.500 2.490 5 / 8 3.000 2.995 9 / 32 13 /
33、32 CL 2 up to and including2 1 / 2 3.500 3.485 3 / 4 4.000 3.992 5 / 16 17 / 32 a BS31BS1813:1974 6 BSI 12-1999 Table 5 Dimensions of BS conduit guides for inch threads All dimensions are in inches. 1 2 3 4 5 6 7 Type E Outside diameter F Shoulder diameter G Flange thickness H Guide bore Max. Min. M
34、ax. a Tolerance +0.000 0 Tolerance +0.010 0 For conduit CS 1.656 1.646 1 13 / 32 0.218 33 / 64 41 / 64 49 / 64 1 1 / 64 1 / 2 5 / 8 3 / 4 1 CM 2.500 2.490 2 3 / 16 0.281 1 1 / 64 1 17 / 64 1 33 / 64 1 1 1 / 4 1 1 / 2 CL 3.500 3.485 3 3 / 16 0.281 2 1 / 64 2 33 / 64 2 2 1 / 2 a To clear stock dimensi
35、onL (seeFigure6)BS1813:1974 BSI 12-1999 7 Table 6 Dimensions of BS conduit stocks for inch threads All dimensions are in inches. 1 2 3 4 5 6 7 8 9 10 11 12 Type Die counterbore L M N O P R S Bore for guide Recess centres Recess depth Clamp nut diameter Clamp screw Recess radius Clamp nut recess J Di
36、ameter K Depth Max. Min. Nominal Min. Max. Min. Nominal Tolerance +0.004 0.008 Tolerance +0.008 0 CS 1.664 1.658 11 / 16 1 7 / 16 2.005 2.000 7 / 32 5 / 8 1 / 4 B.S.W. 5 / 16 7 / 32 CM 2.510 2.502 7 / 8 2 7 / 32 3.005 3.000 9 / 32 13 / 16 5 / 16 B.S.W. 13 / 32 9 / 32 CL 3.512 3.502 1 3 7 / 32 4.008
37、4.000 11 / 32 1 1 / 16 3 / 8 B.S.W. 17 / 32 11 / 32BS1813:1974 8 BSI 12-1999 Appendix B Recommended screwing ranges for “G” designation threads to BS2779 It is appreciated that there are occasions when it may be desirable for convenience to use dies of the type shown inAppendix A for screwing“G” des
38、ignation threads to BS2779. The “G” designation screwing ranges appropriate to the three sizes of dies shown inAppendix A are given below. NOTEIt will be necessary to increase the diameter of the guide bore, dimensionH (seeTable 5) to provide suitable clearance for these threads; this may be effecte
39、d, as in the case of guides for conduit threads, by the addition of 1 / 64in to the maximum outside diameter of tubes to BS1387, subject to a tolerance ofin. Die Screwing range Type CS/P 1 / 8in up to and including 1 / 2in“G” designation Type CM/P 1 / 2in up to and including1 in“G” designation Type
40、CL/P 1 in up to and including1 1 / 2in“G” designation +0.010 0BS1813:1974 BSI 12-1999 Publications referred to This standard makes reference to the following British Standards: BS 31, Steel conduit and fittings for electrical wiring. BS 1387, Steel tubes and tubulars suitable for screwing to BS21 pi
41、pe threads. BS 2779, Fastening threads of BSP sizes. BS 3643, ISO metric screw threads. BS 4500, ISO limits and fits. BS 4568, Steel conduits and fittings with metric threads of ISO form for electrical installations. BSI Certification Trade Mark The Kitemark The British Standards Institution is the
42、owner of a registered certification trade mark. It is usually associated with the words “approved to British Standard” as shown below, the number of the relevant British Standard being added. This mark may be used only by those licensed under the certification mark scheme operated by BSI. The presen
43、ce of this mark on or in relation to a product is an assurance that the goods have been produced under a system of supervision, control and testing, operated during manufacture and including periodical inspection of the manufacturers works in accordance with the certification mark scheme of BSI desi
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