BS 2693-2-1964 Specification for screwed studs - Recommendations for high grade studs (with Class 5 interference fit threads to American Standard ASA B1 12)《双头螺栓规范 第2部分 高级双头螺拴(美国标准.pdf
《BS 2693-2-1964 Specification for screwed studs - Recommendations for high grade studs (with Class 5 interference fit threads to American Standard ASA B1 12)《双头螺栓规范 第2部分 高级双头螺拴(美国标准.pdf》由会员分享,可在线阅读,更多相关《BS 2693-2-1964 Specification for screwed studs - Recommendations for high grade studs (with Class 5 interference fit threads to American Standard ASA B1 12)《双头螺栓规范 第2部分 高级双头螺拴(美国标准.pdf(16页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD OBSOLESCENT MARCH 1986 BS 2693-2: 1964 Incorporating Amendment No. 1 Specification for Screwed studs Part 2: Recommendations for high grade studs UDC 621.882.626BS2693-2:1964 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee and end
2、orsed by the Chairman ofthe Engineering Divisional Council, was published under theauthority of the General Council on 19August1964 BSI 12-1999 The following BSI references relate to the work on this standard: Committee references MEE/60 and MEE/60/8 ISBN 0 580 34069 4 Co-operating organizations The
3、 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: The Government departments and scientific and industrial organizations
4、marked with an asterisk in the above list, together with the following were directly represented on the committee entrusted with the preparation of this standard: Associated Offices Technical Committee Institute of Marine Engineers Association of Consulting Engineers Institute of Petroleum Associati
5、on of Mining Electrical and Institution of Civil Engineers Mechanical Engineers Institution of Gas Engineers British Chemical Plant Manufacturers Institution of Heating and Ventilating Engineers Association Institution of Mechanical Engineers British Compressed Air Society Institution of Mechanical
6、Engineers British Electrical and Allied (Automobile Division) Manufacturers Association* Institution of Production Engineers* British Gear Manufacturers Association Locomotive and Allied Manufacturers British Internal Combustion Engine Association of Great Britain* Manufacturers Association* London
7、Transport Board British Iron and Steel Federation* Machine Tool Trades Association* British Mechanical Engineering Federation* Ministry of Defence, Army Department* British Railways Board* Ministry of Defence, Navy Department* Crown Agents for Oversea Governments Ministry of Labour (H.M. Factory Ins
8、pectorate) and Administrations Ministry of Power D.S.I.R. National Engineering Laboratory Ministry of Public Building and Works Electricity Council, the Generating Board and Ministry of Transport the Area Boards in England and Wales National Coal Board Engineering Equipment Users Association* Nation
9、al Physical Laboratory (D.S.I.R.)* Gas Council Radio Industry Council High Commission of India* Royal Institute of British Architects Agricultural Engineers Association Council of British Manufacturers of Petroleum Association of Hydraulic Equipment Equipment Manufacturers Electronic Engineering Ass
10、ociation Bright Bolt although the absence of adverse comment and reception of favourable reports have now led the Committee responsible to confirm it, without technical change, as an American Standard, users in the U.S.A. are still urged to report on the results, whether good or bad, of applying its
11、 requirements. Information gained from such experience will be taken into account when considering any future amendment or revision of the standard. These Recommendations are issued on the same basis and users are most strongly requested to advise the British Standards Institution of the results the
12、y obtain. In this way it is hoped ultimately to be able to specify a series of stud fits which have been proved by practical experience. 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
13、. 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 and ii, pages1 to 10 and a back cover. This standard has been updated (see copyright date) and may have had amendment
14、s incorporated. This will be indicated in the amendment table on the inside front cover.BS2693-2:1964 BSI 12-1999 1 Introduction (From the introduction to American standard ASAB1.12) Interference fit threads are threads in which the externally threaded member is larger than the internally threaded m
15、ember when both members are in a free state and which, when assembled, become the same size and develop a holding torque through elastic compression, plastic movement of material, or both. By custom, these threads are designated Class5. HandbookH28, “Screw thread standards for Federal Services” has
16、for several editions published specifications for tentative Class5 and alternate Class5 fits. These standards were helpful in stabilizing design; however, in spite of restrictive tolerances, loosening or breakage of externally threaded members has been all too frequent. HandbookH28 has also establis
17、hed minimum and maximum torque values, the validity of which has been generally accepted in service for the past twenty years. The present standard, which is based on ten years of research testing and field study, represents the first attempt to establish an American standard for interference fit th
18、reads. A comprehensive survey of design, production and driving practices in the automotive, implement, railroad, and fastener industries begun in1947 showed that all were experiencing difficulty. Typical problems were: i) The variety of materials and heat treatment used for externally threaded memb
19、ers; ii) Variations resulting from rolling, cutting or grinding external threads; iii) The huge variety of analyses and physical and mechanical properties encountered in the forged, cast, die cast and rolled materials into which the externally threaded members are driven; iv) The widely varying effe
20、cts of chemical coatings, platings and lubricants; and v) The inability to control closely sizes of tapped holes in various materials. It was impossible to establish a standard when the results of this survey were first available, but it was agreed that interference fit threads could not be eliminat
21、ed in design of equipment and that a workable standard was essential. In1951 a research sub-group was established and conducted extensive tests under a variety of conditions. The work of this research sub-group and a report of subsequent research and field experience is described in the article “New
22、 Class5 Interference Fit Thread”, by W. C. Waltermire, which appeared in the September6, 1956, issue of “Machine Design”. The standard is based on the following conclusions which have been drawn from the research and field experience: i) Materials of the external and internal interference fit thread
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