1、BRITISH STANDARD BS 4439:1969 Specification for Screwed studs for general purposes Metric series UDC 621.882.626BS4439:1969 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee,was published underthe authorityof the Executive Boardon 28 February 1969 B
2、SI 04-1999 The following BSI references relate to the work on this standard: Committee references MEE/60 and MEE/60/8 Draft for comment 68/13856 ISBN 580 05407 1 Co-operating organizations The Mechanical Engineering Industry Standards Committee under whose supervision this British Standard was prepa
3、red, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Institute of Marine Engineers Association of Consulting Engineers Institution of Civil Engineers Association of Mining Electrical and Institu
4、tion of Gas Engineers Mechanical Engineers Institution of Heating and Ventilating Engineers Board of Trade Institution of Mechanical Engineers British Chemical Plant Manufacturers Institution of Mechanical Engineers (Automobile Association Division) British Compressed Air Society Institution of Prod
5、uction Engineers* 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 Min
6、istry of Defence 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 Minis
7、try of Technology National Engineering Department of Employment and Productivity Laboratory* (H.M. Factory Inspectorate) Ministry of Transport Electricity Council, the Central Electricity National Coal Board* Generating Board and the Area Boards in National Physical Laboratory (Ministry of England a
8、nd Wales* Technology) Engineering Equipment Users Association* Radio Industry Council Gas Council 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 represe
9、nted on the committee entrusted with the preparation of this British Standard: Association of Hydraulic Equipment Institute of Iron and Steel Wire Manufacturers Manufacturers Ministry of Defence, Navy Department Black Bolt and Nut Association of Post Office Great Britain Bright Steel Bar Association
10、 Precision Bolt and Nut Institute British Bolt, Nut, Screw and Rivet Federation Rolled Thread Screw Association British Railways Board Scientific Instrument Manufacturers British Constructional Steelwork Association Association British Cycle and Motor Cycle Industries Society of Motor Manufacturers
11、and Traders Association Ltd. Limited Council of British Manufacturers of Petroleum Washer Manufacturers Association of Equipment Great Britain Electronic Engineering Association Individual manufacturers Fasteners and Turned Parts Institute Amendments issued since publication Amd. No. Date CommentsBS
12、4439:1969 BSI 04-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Nomenclature 1 3 Nominal length 1 4 Ends of studs 1 5 Plain portion 1 6 Length of thread 3 7 Screw threads 3 8 Straightness 5 9 Strength grade designation system for steel screwed studs 5 10 M
13、aterial of steel screwed studs 6 11 Mechanical properties of steel screwed studs 7 12 Inspection and testing 7 13 Marking and identification 7 14 Complete designation for the purposes of an enquiry or order 7 Appendix A Chemical composition of steel screwed studs 12 Appendix B Testing of mechanical
14、properties of steel screwed studs 14 Appendix C BSI Policy statement on screw threads and the metric system 16 Appendix D Preferred standard sizes of ISO metric screwed studs 18 Appendix E Related British Standards 19 Figure 1 Screwed stud. Metric series 1 Figure 2 Depth of decarburization on steel
15、screwed studs 6 Figure 3 Test piece 14 Figure 4 Application of proof load to full size stud 16 Table 1 Standard nominal lengths and tolerances on the standard nominal lengths of screwed studs 2 Table 2 Standard thread lengths for the nut end of screwed studs 4 Table 3 Limits and tolerances for alter
16、native oversize “OS” thread for metal end of screwed studs 5 Table 4 Strength grade designations of steel screwed studs 6 Table 5 Mechanical properties of steel screwed studs 9 Table 6 Acceptance tests for steel screwed studs 10 Table 7 Proof loads for steel screwed studs 11 Table 8 Chemical composi
17、tion of steel screwed studs 13BS4439:1969 ii BSI 04-1999 Foreword A complete list of British Standards, numbering over 9,000, fully indexed and with a note of the contents of each, will be found in the BSI Catalogue which may be purchased from BSI Sales Department. The catalogue may be consulted in
18、many public libraries and similar institutions. This standard makes reference to the following British Standards, and to those listed in Appendix E: BS 18, Methods for tensile testing of metals. BS 21, Pipe threads. BS 131, Methods for notched bar tests. Part 3: The Charpy U-notch impact test on met
19、als. BS 240, Method for Brinell hardness test. Part 1: Testing of metals. BS 427, Method for Vickers hardness test. Part 1: Testing of metals. BS 891, Method for Rockwell hardness test. Part 1: Testing of metals. BS 1580, Unified screw threads. BS 2693, Screwed studs. Part 1: General purpose studs.
20、BS 3382, Electroplated coatings on threaded components. BS 3580, Guide to design considerations on the strength of screw threads. BS 3643, ISO metric screw threads Part 1: Thread data and standard thread series Part 2: Limits and tolerances for coarse pitch series threads. This British Standard has
21、been prepared under the authority of the Mechanical Engineering Industry Standards Committee as a result of the decision taken in November,1965, to adopt the ISO metric screw thread system in the UK (seeAppendix C). This standard has been drawn up to cover screwed studs for general purpose applicati
22、ons and as such it is a parallel metric standard to BS2693-1 1) , which relates to inch series screwed studs and makes provision for what are generally termed “transition fit” threads. BSI have for some time been liaising with several standards authorities in Europe since there are no ISO recommenda
23、tions or proposals in existence dealing with the complex problem of the screw thread limits and tolerances at the metal end of screwed studs. Account has been taken of current European practice in drawing up this specification and a choice of classes of thread on the metal end is given to satisfy th
24、e requirements of those who require an oversize thread. Pending any international agreement in this respect, limits and tolerances for an optional alternative oversize thread for the metal end of the stud have been specified, for which the pitch (effective) and minor diameters have been increased by
25、 an amount equal to the tolerance on the pitch (effective) diameter, which when used with a “4H” hole gives a maximum interference similar to that of a BS Fine thread to BS2693-1 when used with a BS84 2)“close fit” hole; the maximum clearance is however slightly greater. The more complex problem of
26、“interference fit” threads is referred to at some length in the Foreword of BS2693-2 1) . Research on this problem in respect of metric screwed studs is currently being carried out in Eastern Europe and should the necessity for a specification for fully interference fit threaded screwed studs be est
27、ablished, a second part of this standard could be prepared. 1) BS 2693, “Screwed studs”, Part 1: “General purpose studs”, Part 2: “Recommendations for high grade studs”. 2) BS 84, “Parallel screw threads of Whitworth form”.BS4439:1969 BSI 04-1999 iii Although there are no ISO recommendations relatin
28、g exclusively to screwed studs account has been taken of the following publications prepared by Technical Committee ISO/TC 2 “Bolts, nuts and accessories”: ISO Recommendation R225, “Bolts, screws and studs. Dimensioning”. Draft ISO Recommendation DR911, “Mechanical properties of fasteners”, Part 1:
29、“Bolts, screws and studs”. Draft ISO Recommendation DR950, “Nominal lengths for bolts, screws and studs, thread lengths for general purpose bolts”. It is to be emphasized that although the draft recommendations listed above have yet to be finally ratified, they have been provisionally agreed and are
30、 being progressively incorporated into the national standards of ISO member countries. Attention is particularly drawn to Clauses2 and3 of this standard as these are affected by ISO Recommendation R225. It will be seen in Figure 1 that the nominal length for metric studs is the “projecting length”,
31、whereas in BS2693 the overall length is denoted as the nominal length. Although the provisions of ISO/R225 are contrary to current British and American practice, it is felt that they will need to be adopted in this metric standard in line with the general policy of changing over to metric system in
32、the UK and taking account of current Continental practice. NOTE 1Although the mechanical requirements specified in this standard are in metric technical units (i.e.kgf/mm 2 ), in accordance with present ISO agreements (ISO/DR911), comparable SI units have been included in anticipation of future inte
33、rnational agreement in this respect.1kgf=9.80665 newtons. For further information about SI units see BS3763, “International System (SI) units”, BS350, “Conversion factors and tables”, Supplement No.1, “Additional tables for SI conversions” and PD5686, “The use of SI units”. NOTE 2See Appendix E for
34、related British Standards. NOTE 3The products referred to in this specification “screwed nuts”, should not be confused with products used on pipe flanges which are commonly referred to as “stud bolts”. A British Standard does not purport to include all the necessary provisions of a contract. Users o
35、f 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, pages i to iv, pages1 to 20, an inside back cover and a back
36、 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.iv blankBS4439:1969 BSI 04-1999 1 1 Scope 1.1 This British Standard specifies the dimensions and tolerances for screwed studs
37、with ISO metric threads in diameters from3mm to39mm inclusive, intended for general purposes. 1.2 Mechanical properties are given only in respect of carbon or alloy steel screwed studs which are not to be used for special applications, such as those requiring weldability or corrosion resistance. 1.3
38、 The dimensional requirements of this standard also apply to non-ferrous and stainless steel screwed studs. 2 Nomenclature For the purposes of this standard the nomenclature given below and the terms illustrated in Figure 1 apply: 1) Metal end. The end of the stud which is screwed into the component
39、. 2) Nut end. The end of the stud which is not screwed into the component. 3) Plain portion. The unthreaded length of stud. 3 Nominal length The nominal length of the stud shall be measured from the nut end including the chamfer, to the extreme end of the runout of the thread on the metal end (seeFi
40、gure 1). NOTEClause3 is based on ISO/R225 and is different from the definition in Clause4 of BS2693, “Screwed studs”, Part1:1956, “General purpose studs”. 3.1 The standard nominal lengths are given in Table 1. 3.2 The tolerances on the standard nominal lengths shall be as given in Table 1. NOTESee A
41、ppendix D for preferred standard sizes. 4 Ends of studs The ends of the studs shall be finished with a straight chamfer with a90 included angle to a depth slightly exceeding the depth of thread. 5 Plain portion 5.1 The length of the plain portion shall not be less than half the nominal diameter (d)
42、of the thread and shall be taken to include the runout threads on the nut end of the studs. Figure 1 Screwed stud. Metric seriesBS4439:1969 2 BSI 04-1999 Table 1 Standard nominal lengths and tolerances on the standard nominal lengths ofscrewed studs 5.2 The nominal diameter of the plain portion shal
43、l be equal to the maximum (basic) major diameter of the threaded ends and subject to the tolerances in the following table: Dimensions in millimetres Nominal length Tolerance Nominal length Tolerance 12 14 16 0.35 0.35 0.35 120 (125) 130 0.70 0.80 0.80 (18) 20 (22) 25 (28) 0.50 0.50 0.50 0.50 0.50 1
44、40 150 160 170 180 0.80 0.80 0.80 0.80 0.80 30 (32) 35 (38) 40 0.50 0.50 0.50 0.50 0.50 190 200 220 240 260 1.0 1.0 1.0 1.0 1.0 45 50 55 60 65 0.50 0.50 0.60 0.60 0.60 280 300 325 350 375 1.0 1.0 1.2 1.2 1.2 70 75 80 85 90 0.60 0.60 0.60 0.70 0.70 400 425 450 475 500 1.2 1.3 1.3 1.3 1.3 (95) 100 (10
45、5) 110 (115) 0.70 0.70 0.70 0.70 0.70 NOTE 1Lengths shown in brackets are non-preferred. NOTE 2See Appendix D for preferred standard sizes. Nominal diameter d Tolerance mm mm 3 over3 up to6 over6 up to 10 over 10 up to 18 over 18 up to 30 over 30 up to 39 + 0 0.09 + 0 0.12 + 0 0.15 + 0 0.18 + 0 0.21
46、 + 0 0.25BS4439:1969 BSI 04-1999 3 6 Length of thread 6.1 Metal end 6.1.1 The length of the thread on the metal end of the stud shall include the runout threads and shall be equal to the nominal diameter of the thread or to one and a half times the nominal diameter of the thread, as specified by the
47、 purchaser. 6.1.2 The length of thread runout shall be not less than2 pitches or more than2pitches. 6.1.3 The tolerance on the length of thread shall be as given in the following table: 6.2 Nut end 6.2.1 The length of thread on the nut end of the stud shall not include the runout threads and shall b
48、e in accordance with the table given below, except in the cases of short studs where this would result in a length of plain portion less than d. In such cases a length of plain portion equal to d should be allowed for before threading the remainder for the nut end. Thread lengths based on these form
49、ulae are given in Table 2. 6.2.2 The length of thread runout shall not exceed 2 pitches. 6.2.3 The tolerance on the length of thread shall be plus two pitches on all diameters, as given in Table 2. 7 Screw threads 7.1 General. The form of the thread, diameters and associated pitches of standard screwed studs, metric series, shall be in accordance with BS3643-1 3) . 7.2 Metal end. The screw thread on the metal end sh
