1、AN AMERICAN NATIO NAL STANDARDMetricRound Head Short Square Neck BoltsASME B18.5.2.1M-2006Revision of ASME B18.5.2.1M-1996(R2003)REAFFIRMED 2011FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgIntentionally left blankASME B18.5.2.1M-2006Revision of ASME B18.5.2.1M-1996(R2003)MetricRound HeadSh
2、ort SquareNeck BoltsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Date of Issuance:October 2,2006This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning
3、interpretations of technical aspects of thisStandard.Interpretations are published on the ASME website under the Committee Pages athttp:/www.asme.org/codes/as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under pr
4、ocedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable f
5、orpublic review andcomment thatprovides an opportunityfor additional publicinput 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 the validi
6、ty of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised that
7、determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or
8、standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval
9、system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2006 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespo
10、ndence With the B18 Committee.vi1Introductory Notes.12General Data.2Tables1Dimensions of Round Head Short Square Neck Bolts.32Length Tolerances.43Maximum Grip Lengths,Lg,and Minimum Body Lengths,Ls.54Thread Lengths.5Nonmandatory AppendicesAGage and Gaging for Checking Bolt Straightness.7BRecommended
11、 Clearance Holes for Metric Round Head Short Square Neck Bolts.8iiiFOREWORDASMEStandardsCommitteeB18fortheStandardizationofBolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners(formerly American National Standards Committee B18),was originatedin March 1922 as Sectional Committee B18 under the aegis
12、 of the American Engineering StandardsCommittee(later the American Standards Association,the United States of America StandardsInstitute,and,as of October 6,1969,the American National Standards Institute,Inc.)with theSociety of Automotive Engineers and the American Society of Mechanical Engineers as
13、 jointsponsors.Subcommittees 2,5,and 6(later redesignated Subcommittee 9)were subsequentlyestablishedandchargedwiththeresponsibilitiesforthetechnicalcontentofstandardsfor:externaldrive bolts and nuts,round unslotted head bolts,and plow bolts and nuts,round unslotted headbolts,and plow bolts,respecti
14、vely.Subcommittee 9 was merged into Subcommittee 5 in 1977.In October 1978,drafting of this Standard was started.The draft was circulated for letter ballotof Subcommittee 5 and Committee B18 on March 27,1980.Following approval by Subcommittee5 and Committee B18,this Standard was approved by the secr
15、etariat and submitted to theAmerican National Standards Institute for designation as an American National Standard.Thiswas granted on August 14,1981.InDecember1986,ASMECommitteeB18agreedtocombineSubcommittee5intoSubcommittee2,since the products addressed by the two Subcommittees were quite similar.C
16、ommittee B18further agreed the designations of the Subcommittee 2 and 5 documents not be changed,sincesuch changes would adversely affect current references to these Standards.Following approval by Subcommittee 2 and Committee B18,the 1996 edition was approvedby the secretariat and submitted to the American National Standards Institute for approval asan American National Standard.This was granted on March 8,1996.This revision,ASME B18.5.2.1M-2006,was approved by the American National StandardsIn