1、Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-The 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 SIUARE HEAD BOLTS(METRIC SERIES)ASME B18.2.3.1 OM-1 N
2、UI Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-Date of Issuance:March 31,1998 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or wri
3、tten interpretations of the requirements of this Standard issued to this edition.ASME 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 Consensus Comm
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9、ociety of Mechanical Engineers 345 East 47th Street New York,NY 10017 Copyright Q 1998 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted withou
10、t license from IHS-,-FOREWORD(This Foreword is not a part of ASME B18.2.3.10M-1996.)ASME Standards Committee B18 for the Standardization of Bolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners(formerly American National Standards Committee B 18),was originated in March 1922 as Sectional Committee
11、B18 under the aegis of the American Engineering Standards Committee(later the American Standards Association,the United States of America Standards Institute and,as of October 6,1969,the American National Standards Institute,Inc.)with the Society of Automotive Engineers and the American Society of M
12、echanical Engineers as joint sponsors.Subcommittee 2 was subsequently established and charged with the responsibility for the technical content of standards covering external drive bolts,screws and nuts.At its meeting on December 4,1974,Committee B18 authorized preparation of a series of standards f
13、or metric fasteners.Subcommittee 2 was assigned responsibility for developing standards for metric hex bolts,screws and nuts(later,for external drive and similar threaded fasteners).Eventually,a need for metric square head bolts was also recognized,for example,in applications as bolster mounting bol
14、ts in mechanical power presses.In January 1992,Subcommittee 2 prepared the draft standard for metric square head bolts,based on metric hex b o l t s by merely changing the hexagon to a square with the same width across flats,since there was no International Standard for square head bolts.This Standa
15、rd was approved by letter ballot of ASME Standards Committee B18 and Subcommittee 2 on July 26,1995,and was subsequently approved by the secretariat and submitted to the American National Standards Institute for designation as an American National Standard.This was granted on December 4,1996.111 Cop
16、yright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME BI8 STANDARDS COMMITTEE Standardization of Bolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERS K.E.McCullough,Chair D.A.Clever,Vice Chair E.Schwartz,Vice Chair A.M.Nickles,Secretary COMMITTEE PERSONNEL J.C.Akins.Safety Socket Screw Corp.J.B.Beiford,L
