1、A N A M E R I C A N N A T I O N A L S T A N D A R D Inspection and Quality Assurance for Fasteners for Highly Specialized Engineered Applications ASMEIANSI B18.18.4M-1987 REAFFIRMED 1999 FOR CURRENT COMMITTEE PERSONNEL PLEASE SEE ASME MANUAL AS-11 SPONSORED AND PUBLISHED BY T H E A M E R I C A N S O
2、 C I E T Y O F M E C H A N I C A L E N G I N E E R S United Engineering Center 345 East 47th Street New York,N.Y.1001 7 Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permit
3、ted.Uncontrolled when printed.Date of Issuance:March 31,1987 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the requirements of this Standard issued to this Edition.This code or standard was developed under
4、 procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made avail
5、able for public review and comment which provides an opportunity for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not approve,rate,or endorse any item,construction,proprietary device,or activity.ASME does not take any position with respect to t
6、he validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume any such liability.Users of a code or standard are expressly a
7、dvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s1 or person(s)affiliated with industry is not to be interpreted as government or industry endorsement o
8、f this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers.No part of this document may be reproduced in any form,in an electronic retrieva
9、l system or otherwise,without the prior written permission of the publisher.Copyright 0 1987 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford Univers
10、ity User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORD(This Foreword is not part of ASME/ANSI B18.18.4M-1987.)American National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was organized in March 1922 as S
11、ectional Committee B18 under the aegis of the American Engineering Standards Committee(later the American Standards Association,then the United States of America Standards Institute and,as of October 6,1969,the American National Standards Institute,Inc.)with the Society of Auto-motive Engineers and
12、the American Society of Mechanical Engineers as joint sponsors.Subcommittee 18 of Committee B18 was established in September 1978 to develop a doc-ument to cover the quality assurance provisions for internally and externally threaded met-ric fasteners and accessories or associated parts.At the March
13、 1979 meeting of Subcommittee 18,it was agreed that the quality assurance document should be circulated for subcommittee consideration as a proposed standard.Subcommittee acceptance of the content ensued and the document was approved by letter ballot to the American National Standards Committee B18
14、on March 21,1980.The standard was subsequently approved by the Secretariat and submitted to the Ameri-can National Standards Institute for designation as an American National Standard;it was designated ANSI B18.18.4M-1982 and approved on September 14,1982.A periodic review of the standard,undertaken
15、 by the Subcommittee in 1985,resulted in agreement that the document be revised to allow it to be used for inch as well as metric prod-ucts.This was done by deleting the word“metric”from the title as well as from each place in the standard where it would inhibit the use of the document for inch as w
16、ell as metric products.By retaining the“M”in the designator,the standard can be used for both inch and metric products without having to change any references made.A proposal containing these changes,as well as editorial corrections,was prepared and balloted by letter ballot to ASME Committee B18.Following approval by ASME,the proposal was submitted to the American National Standards Institute and designated an American National Standard on January 16,1987.iii Copyrighted material licensed to St