1、COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesThe American Society of Mechanical Engineers 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 METRIC HEX CAP SCREWS
2、 ASME B 1 8 m L 3 m l M-I f i l l Revision 01 A N S I I 1 8.2.3.1 M-1979(RlNfl5)COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesDate of Issuance:December 31,1999 The
3、1998 edition of this Standard is being issued with an automatic addenda subscription service.The use of an addenda allows revisions made in response to public review comments or committee actions to be published as necessary.The next edition of this Standard is scheduled for publication in 2004.ASME
4、 is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Standards Committee that approved the code or standard was balanced to assure that individuals from
5、 competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not approve,r
6、ate,or endorse any item,construction,proprietary device,or activity.ASME does not take any position with respect to the 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 in
7、fringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expressly advised 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 re
8、presentativeb)or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies,which preclude
9、s the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical Engineers Three Park Avenue,New York,NY 10016-5990 Copyright
10、 Q 1999 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesFOREWORD American Nationa
11、l Standards Committee B 18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was organized in March of 1922,as Sectional Committee B18 under the aegis of the American Engineering Standards Committee(later the American Standards Association,then the United States of America St
12、andards Institute and,as of October 6,1969,the American National Standards Institute,Inc.),with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors.Subcommittee 2 was subsequently established and charged with the responsibility for technical content
13、 of standards covering wrench head bolts and nuts.At its meeting on December 4,1974,Committee B18 authorized preparation of a series of standards for metric fasteners.Subcommittee 2 was assigned responsibility for developing standards for metric hex bolts,screws,and nuts.On September 22,1976,Subcomm
14、ittee 2 organized the contents of a standard covering eight different hex head screw and bolt products.Actual drafting was postponed until ISO/TC2 could reach final decisions relating to the basic dimensions and characteristics of hex bolts,screws,and nuts.At ISO/TC2 meetings held in April of 1977,f
15、inal actions were taken.Committee B18 affirmed the TC2 decisions at a meeting on June 29,1977,and drafting of this Standard was started.Committee B 18,in February of 1978,established a cooperative program with the Department of Defense to draft American National Standards for metric fasteners in suc
16、h a way that they could be used directly by the Government for procurement purposes.The Department of Defense requested that each of the eight products be covered in separate standards,and Subcommittee 2 accepted this approach at its meeting on June 27,1978.This Standard was approved by letter ballot of Committee B 18 on September 15,1978,and was subsequently approved by the secretariat and submitted to the American National Standards Institute for designation as an American National Standard.Th
