2005_2017.pdf

AN AMERICAN NATIO NAL STANDARDHelical Coil Screw Thread Inserts:Free Running and Screw Locking(Metric Series)ASME B18.29.2M-2005REAFFIRMED 2017Intentionally left blankASME B18.29.2M-2005Helical CoilScrew ThreadInserts:FreeRunning andScrew Locking(Metric Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Date of Issuance:February 6,2006This 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 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 procedures 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 forpublic 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 validity 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 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 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 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.vCorrespondence With the B18 Committee.vi1General.12Comparison With ISO Standards.13References.14Terminology.15Dimensions.16Description.17Class of Fit.28Types of Inserts.29STI-Tapped Hole.210Helical Coil Insert.511Inspection and Quality Assurance.5Figures1Tapping Depths.22Insert Configuration.63Torque Test Spacer.13Tables1STI-Threaded Hole Data.32Chemical Composition.53Insert Length Data.74Insert Dimensions.95Self-Locking Torque.126Torque Test Spacer Dimensions.13Nonmandatory AppendicesAInsert Length Selection.15BScrew Thread Insert Taps.16CInstallation.17iiiFOREWORDThe helical coil screw thread insert was invented in the 1930s and found acceptance in aircraftmanufactured and serviced by the Allied air forces during World War II.Since that time,applica-tions for helical coil inserts have come into broad usage in aerospace,automotive,and industrialoriginal equipment design,production salvage(repair),and in service repair.Although this usagedid include metric spark plug sizes,the regular metric series was delineated in Europe in the1950s and came into production in the Customary unitsusing countries in the 1960s.Subcommittee 29,Threaded Inserts,met initially in May 1989 after authorization by the ASMEB18 Committee to proceed with the development of standards covering screw thread inserts.This ASME Standard for the metric series of helical coil screw thread inserts follows ASMEB18.29.1-1993,Helical Coil Screw Thread Inserts Free Running and Screw Locking(Inch Series).ASME B18.29.2M-2005 was approved as an American National Standard on May 26,2005.ivASME B18 COMMITTEEStandardization 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.)STANDARDS COMMITTEE OFFICERSD.A.Clever,ChairR.D.Strong,Vice ChairS.W.Vass,Vice ChairR.L.Crane,SecretarySTANDARDS COMMITTEE PERSONNELJ.Altman,Rotor Clip Co.J.H.Slass,Alternate,Rotor Clip Co.J.B.Belford,Lawson Products,Inc.V.Cartina,Aztech LocknutD.A.Clever,Deere and Co.A.P.Cockman,Ford Motor Co.T.Collier,Cam-Tech Industries,Inc.R.L.Crane,The American Society of Mechanical EngineersA.C.DiCola,Wrought Washer Co.B.A.Dusina,Federal Screw WorksD.S.George,Ford Motor Co.J.S.Foote,Trade Association Management,Inc.J.Greenslade,Greenslade and Co.J.J.Grey,Fastener Consulting Services,Inc.B.Hasiuk,Defense Industrial Suppl