ASME_B18-2-4-1M-2002.pdf

Copyrighted 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.AN AMERICAN NA TIONALST ANDARDMETRIC HEX NUTS,STYLE 1ASME B18.2.4.1M-2002Revision of ANSI B18.2.4.1M-1979(R1995)Copyrighted 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.Date of Issuance:April 1,2002This Standard will be revised when the Society approves the issuance of anew edition.There will be no addenda issued to this edition.ASME will issue written replies to inquiries concerning interpretation oftechnical aspects of this Standard.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 forAmerican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand comment that 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 the validity of any patent rights asserted inconnection withany itemsmentioned inthis document,and doesnot undertaketo insureanyoneutilizing a standard against liability for infringement of any applicable letters patent,nor assumeany such liability.Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights,and the risk of infringement of such rights,is entirely theirown responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies,which precludes the issuanceof 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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2002 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyrighted 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.CONTENTSForeword.vCommittee Roster.viCorrespondence With the B18 Committee.viii1General.11.11Scope.2Comparison With ISO Standards.13References.14Terminology.25Dimensions.26Width Across Flats.27Thickness.28Tops and Bearing Surfaces.29Corner Fill.210True Position of Hexagon to the Tapped Hole.211Countersink.212Threads.212.12Thread Series and Tolerance Class.12.24Thread Gaging.12.34Overtapped Threads.13Material and Mechanical Properties.413.14Steel.13.24Corrosion-Resistant Steels.13.34Nonferrous Metal.14Finish.415Identification Symbols.415.14Carbon and Alloy Steel Nuts.15.24Stainless Steel Nuts.15.34Nonferrous Nuts.16Inspection and Quality Assurance.4iiiCopyrighted 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.17Dimensional Conformance.418Designation.419Options.520Workmanship.5Table1Dimensions of Hex Nuts,Style 1.3ivCopyrighted 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.FOREWORDAmerican National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was organized in March 1922 as Sectional CommitteeB18 under the aegis of the American Engineering Standards Committee(later the AmericanStandards Association,then the United States of America Standards Institute and,as ofOctober 6,1969,the American National Standards Institute,Inc.),with the Society ofAutomotive Engineers and the American Society of Mechancial Engineers as joint sponsors.Subcommittee 2 was subsequently established and charged with the responsibility for technicalcontent of standards covering wrench head bolts and nuts.At its meeting on December 4,1974,Committee B18 authorized preparation of a seriesof standards for metric fasteners.Sucommittee 2 was assigned responsibility for developingstandards for metric hex bolts,screws,and nuts.At a meeting on September 22,1976,Subcomm