BS-7776-1995.pdf
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1、BRITISH STANDARD BS 7776:1995 Glossary of Torque terminology for threaded fasteners UDC 531.232:001.4:621.88 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:18:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7776:1995 This British Standard, having been prepa
2、red under the direction of the General Mechanical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 February 1995 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference GME/9 Draft f
3、or comment 93/712368 DC ISBN 0 580 23253 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/9, upon which the following bodies were represented:
4、BEAMA Ltd. British Constructional Steelwork Association Ltd. British Industrial Fasteners Federation British Steel Industry British Steel Industry (Wire Section) Gauge and Tool Makers Association National Association of Fastener Stockholders Society of Motor Manufacturers and Traders Limited Washer
5、Manufacturers Association of Great Britain The following bodies were also represented in the drafting of the standard, through subcommittees and panels: National Centre of Tribology Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: Lo
6、ndon South Bank University, London South Bank University, Fri Dec 08 10:18:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7776:1995 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordii Glossary1 Licensed Copy: London South Bank University, London South Bank University, Fr
7、i Dec 08 10:18:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7776:1995 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee and includes definitions of terms relating to the torque terminology of faste
8、ners. In the design, assembly, quality assessment and standardization of threaded fasteners and joints, expressions are frequently used which relate to the various torque functions which are required to be applied or assessed. Much confusion is generated by the multiplicity of terms used throughout
9、industry. As a basic reference document providing a comprehensive list of terms, this glossary is intended to promote better understanding between the various sections of industry and the users of fasteners. Many of the definitions in this glossary are essentially the same as those used in other Bri
10、tish Standards already published. As these British Standards are revised and new standards are produced, the use of the definitions given in this glossary will be encouraged in order to promote wider acceptance and recognition of standard terminology. In this glossary, terms are arranged in alphabet
11、ical order. In the definitions, italics have been used to indicate terms that are defined elsewhere in this glossary. 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
12、 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, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Th
13、is will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:18:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7776:1995 BSI 07-19991 Glossary No.TermDefinition 1break loose torqueThe torque, applied
14、 in the reverse direction to tightening, required to initiate rotation of a tightened fastener thus releasing the assembled clamping force. 2cam-out torqueThe maximum torque which can be applied to a fastener assembly tool before the end load required to maintain functional contact between the tool
15、and the driving recess exceeds that which can be considered as a nominal manual pressure. 3free-running torqueThe torque required to rotate a threaded fastener during assembly with a mating threaded component before either of the following occurs: a) a clamping force is generated; or b) it comes int
16、o contact with a device which displays frictional resistance to rotation. 4prevailing torqueThe torque necessary to overcome the resistance to rotation generated by a prevailing torque feature, measured with the fastener approximately in constant motion and with no clamping force developed against t
17、he bearing surface of the fastener. 5prevailing torque feature A feature of a threaded fastener which displays frictional resistance to rotation due to a self-contained device. NOTEThe frictional resistance is not a consequence of a clamping force developed against the bearing surface of the fastene
18、r. 6removal torqueThe torque necessary to rotate a threaded fastener, applied in the reverse direction to the tightening torque after the clamping force has been released. 7self-lockingA generic term used to indicate resistance to rotation. NOTEThis definition is not intended to imply an indefinite
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