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3-5M_R2002_E1986.pdf

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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 Hexagon Socket Flat Countersunk Head Cap Screws(Metric Series)ASMEIANSI B18.3.5M-1986 REAFFIRMED 1993 FOR CURRENT COMMITTEE PERSONNEL PLEASE SEE ASME MANUAL AS-1 1 Government Key Words:Screw,Cap,Hexagon Socket,Flat Countersunk Head-Metric SPONSORED

2、 AND PUBLISHED BY T H E A M E R I C A N S O 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 fur

3、ther reproduction or distribution is permitted.Uncontrolled when printed.REAFFIRMED 2002FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgDate of Issuance:February 28,1987 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written i

4、nterpretations of the requirements of this Standard issued to this Edition.This code or standard was developed under 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 c

5、ompetent and concerned interests have had an opportunity to participate.The proposed code or standard was made available 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,ra

6、te,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,por 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、presentative(s1 or personk)affiliated with industry is not to be in1.erpreted as government or industry endorsement of 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 inte

9、rpretations by individual volunteers.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.Copyright 0 1987 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyr

10、ighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORD(This Foreword is not part of ASME/ANSI B18.3.5M-1986.)American National Standards Comm

11、ittee B18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was organized in March 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 Standards Institute a

12、nd,as of October 6,1969,the American National Standards Institute)with the Society of Automo-tive Engineers and the American Society of Mechanical Engineers as joint sponsors.Subcommittee 9 was established in April of 1929 to undertake development and oversee maintenance of standards covering socket

13、 head cap screws and set screws.In line with a gen-eral realignment of the subcommittee structure on April 1,1966,Subcommittee 9 was redes-ignated Subcommittee 3.Over the intervening years this activity has produced several ver-sions of American National Standards covering inch series socket cap,sho

14、ulder,and set screws bearing the B18.3 designation.At the December 4,1974 meeting of American National Standards Committee B18,Sub-committee 3 was assigned the task of preparing standards for metric series socket screw products paralleling that contained in the latest ANSI B18.3 document.The Subcomm

15、ittee was also instructed to continue coordination with the International Standards Organiza-tion,IS0 Technical Committee 2,and Working Group 3 under that activity and,to the ex-tent possible,keep the proposals for metric standards under development in conformance with agreements reached therein.Sub

16、sequent meetings of Subcommittee 3 held in February 1975 and January 1976 re-sulted in general agreement on the following basic principles to be considered in developing the metric version of the standard.(a)To assure consumers continuity of performance integrity consistent with inch socket screw products,the metric standards should maintain the same quality levels as their inch counterparts.(6)To facilitate and expedite the processing,acceptance,and adoption of the metric ver-sions,proposals fo

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