1、AN AMERICAN NATIONAL STANDARDHelical Coil Screw Thread Inserts: Free Running and Screw Locking (Metric Series)ASME B18.29.2M-2005ASME B18.29.2M-2005Helical CoilScrew ThreadInserts: FreeRunning andScrew Locking(Metric Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Date of Iss
2、uance: 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
3、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
4、 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 for public review and comment that provides an opportunity for additional public input f
5、rom 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 i
6、n 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
7、 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 interpretatio
8、ns 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
9、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 vi1 General . 12 Comparison Wi
10、th ISO Standards . 13 References 14 Terminology 15 Dimensions . 16 Description . 17 Class of Fit . 28 Types of Inserts . 29 STI-Tapped Hole . 210 Helical Coil Insert . 511 Inspection and Quality Assurance 5Figures1 Tapping Depths 22 Insert Configuration 63 Torque Test Spacer . 13Tables1 STI-Threaded
11、 Hole Data 32 Chemical Composition 53 Insert Length Data . 74 Insert Dimensions 95 Self-Locking Torque 126 Torque Test Spacer Dimensions . 13Nonmandatory AppendicesA Insert Length Selection . 15B Screw Thread Insert Taps . 16C Installation . 17iiiFOREWORDThe helical coil screw thread insert was inve
12、nted 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),
13、 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
14、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-2
15、005 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.
16、 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 Ind
17、ustries, 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,
18、Defense Industrial Supply Center PhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Rockford Fastener, Inc.M. Keller, Corresponding Member, Paracad Technology Co.J. F. Koehl, Spirol International Corp.SUBCOMMITTEE 29 THREADED INSERTSW. J. Lutkus, Chair, Emhart Industrial Heli-CoilR. L. Crane, Secretar
19、y, The American Society of MechanicalEngineersR. C. Caponi, Spirol International Corp.R. L. Davis, Kato Fastening Systems, Inc.W. Giannakakos, Emhart Industrial Heli-CoilA. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.vW. H. Kopke, ITW Shakeproof Assembly ComponentsJ. G. Langenstein, Me
20、mber Emeritus, ConsultantM. Levinson, Alternate, ITW Shakeproof Assembly ComponentsL. L. Lord, Corresponding Member, ConsultantW. J. Lutkus, Emhart Industrial Heli-CoilA. D. McCrindle, Canadian Fasteners InstituteM. D. Prasad, General Motors Corp.J. A. Roley, Corresponding Member, Caterpillar, Inc.W
21、. L. Sakowski, Account Managers LLCS. Savoji, ITW MedalistW. Schevey, BGM Fastener Co., Inc.W. R. Stevens, RamcoR. D. Strong, General Motors Corp.S. W. Vass, Nova Machine ProductsC. B. Wackrow, MNP Corp.R. G. Weber, Fairfield UniversityW. K. Wilcox, ConsultantC. J. Wilson, Industrial Fasteners Insti
22、tuteR. B. Wright, Wright Tool Co.J. G. Zeratsky, National Rivet and Manufacturing Co.J. Jennings, Naval Surface Warfare CenterM. Keller, Paracad Technology Co.H. Lo, Defense Industrial Supply Center PhiladelphiaL. L. Lord, Corresponding Member, ConsultantA. Qaqish, Kato Fastening Systems, Inc.R. D.
23、Strong, General Motors Corp.C. J. Wilson, Industrial Fasteners InstituteCORRESPONDENCE WITH THE B18 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with the Committeeby reques
24、ting interpretations, proposing revisions, and attending Committee meetings. Corre-spondence should be addressed to:Secretary, B18 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990Proposing Revisions. Revisions are made periodically to the Standa
25、rd to incorporate changesthat appear necessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals should beas specific as possibl
26、e, citing the paragraph number(s), the proposed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.Interpretations. Upon request, the B18 Committee will render an interpretation of any require-ment of the Standard. Interpretations can only be re
27、ndered in response to a written request sentto the Secretary of the B18 Standards Committee.The request for interpretation should be clear and unambiguous. It is further recommendedthat the inquirer submit his/her request in the following format:Subject: Cite the applicable paragraph number(s) and t
28、he topic of the inquiry.Edition: Cite the applicable edition of the Standard for which the interpretation isbeing requested.Question: Phrase the question as a request for an interpretation of a specific requirementsuitable for general understanding and use, not as a request for an approvalof a propr
29、ietary design or situation. The inquirer may also include any plansor drawings, which are necessary to explain the question; however, theyshould not contain proprietary names or information.Requests that are not in this format may be rewritten in the appropriate format by the Committeeprior to being
30、 answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant
31、 ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B18 Standards Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting shou
32、ld contact the Secretary ofthe B18 Standards Committee.viASME B18.29.2M-2005HELICAL COIL SCREW THREAD INSERTS:FREE RUNNING AND SCREW LOCKING (METRIC SERIES)1 GENERAL1.1 ScopeThis Standard delineates the dimensional, mechani-cal, and performance data for the metric series helicalcoil screw thread ins
33、ert and threaded hole into whichit is installed. Appendices that describe insert selection,STI (screw thread insert) taps, insert installation, andremoval tooling are also included.The inclusion of dimensional data in this Standard isnot intended to imply that all products described arestock sizes.2
34、 COMPARISON WITH ISO STANDARDSAt this time, no ISO Standard for metric helical coilscrew threads exists. Further, no work within ISO isexpected for some time.3 REFERENCESThe following is a list of publications referenced inthis Standard. Unless otherwise specified, the referencedstandard shall be th
35、e most recent issue at the time oforder placement.ASME B1.3M, Screw Thread Gaging Systems forDimensional Acceptability Inch and Metric ScrewThreads (UN, UNR, UNJ, M, and MJ)ASME B1.13M, Metric Screw ThreadsMProfileASME B1.16M, Gages and Gaging for Metric M ProfileScrew ThreadsASME B1.21M, Metric Scr
36、ew Threads MJ ProfileASME B18.12, Glossary of Terms for Mechanical Fas-tenersASME B18.18.1M, Inspection and Quality Assurance forGeneral Purpose FastenersASME B18.24, Part Identifying Number Code SystemStandard for B18 Fastener ProductsASME B46.1, Surface Texture (Surface Roughness, Wavi-ness, and L
37、ay)ASME B47.1, Gage BlanksASME B94.9, Taps Cut and Ground ThreadsASME Y14.5M, Dimensioning and TolerancingASME Y14.36M, Surface Texture SymbolsPublisher: The American Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive, Box2300, Fairfield,
38、 NJ 07007-23001ASTM B 209M, Standard Specification for Aluminumand Aluminum Alloy Sheet and PlateASTM E 290, Standard Test Method for Bend Testing ofMaterial for DuctilityASTM A 370, Standard Test Methods and Definitionsfor Mechanical TestingASTM F 568M, Carbon and Alloy Steel ExternallyThreaded Met
39、ric FastenersPublisher: The American Society for Testing andMaterials (ASTM), 100 Barr Harbor Drive, West Con-shohocken, PA 19428-2959SAE AMS 4120, Aluminum Alloy, Rolled or Cold Fin-ished Bars, Rods, and WireSAE AS5272, Lubricant, Solid Dry Film, Heat Cured,Corrosion InhibitingSAE J417, Hardness Te
40、sts and Hardness Number Con-versionsPublisher: Society of Automotive Engineers (SAE), 400Commonwealth Drive, Warrendale, PA 15096-00014 TERMINOLOGYFor definitions of terms relating to fasteners or compo-nent features thereof used in this Standard, refer toASME B18.12.5 DIMENSIONS(a) Unless otherwise
41、 stated, all dimensions in thisStandard are in millimeters and apply before any coat-ing. When plating or coating is specified, the finishedproduct dimensions shall be as agreed upon by the sup-plier and purchaser.(b) Symbols specifying geometric characteristics arein accordance with ASME Y14.5M.6 D
42、ESCRIPTIONHelical coil inserts are screw thread bushings coiledfrom wire of diamond-shape cross-section. Inserts arescrewed into STI-tapped holes to form nominal sizeinternal threads. Inserts are installed by torquingthrough a diametral tang. This tang is notched forremoval after installation. In th
43、e free state, they are largerin diameter than the tapped hole into which they areASME B18.29.2M-2005 HELICAL COIL SCREW THREAD INSERTS:FREE RUNNING AND SCREW LOCKING (METRIC SERIES)installed. In the assembly operation, the torque appliedto the tang reduces the diameter of the leading coil andpermits
44、 it to enter the tapped thread. The remainingcoils are reduced in diameter as they, in turn, are screwedinto the tapped hole. When the torque or rotation isstopped, the coils expand with a spring-like actionanchoring the insert in place against the tapped hole.7 CLASS OF FIT7.1 Tolerance Classes 4H5
45、H and 5HSince helical coil inserts are flexible, the class of fit ofthe final assembly is a function of the size of the tappedhole. Helical coil STI taps are available for both ToleranceClass 4H5H (or Class 4H6H) and Class 5Htappedholes. Tolerance Class 5Htapped holes provide maxi-mum production tol
46、erances but result in lower lockingtorques when screw-locking inserts are used. The higherand more consistent torques given in Table 5 are metby the screw-locking inserts when assembled and testedin Tolerance Class 4H5H (or Class 4H6H) tapped holesin accordance with para. 9.7.2 CompatibilityAssemble
47、d helical coil inserts will mate properly withitems that have M Profile external threads in accordancewith ASME B1.13M. Also, due to the radius on the crestof the insert at the minor diameter, the assembled insertwill mate with MJ Profile externally threaded parts withcontrolled radius root threads
48、per ASME B1.21M.8 TYPES OF INSERTS8.1 Free-RunningThe free-running insert provides a smooth, hard, andfree-running thread.8.2 Screw-LockingThe screw-locking insert provides a resilient lockingthread produced by a series of chords on one or moreof the insert coils.9 STI-TAPPED HOLEThe tapped hole int
49、o which the insert is installed shallbe in accordance with ASME B1.13M, except that diame-ters are larger to accommodate the wire cross-section ofthe insert (see Fig. 1). Dimensions of the STI-tapped holeare shown in Table 1 and are calculated per GeneralNote (c) to Table 1.9.1 Screw Thread Designation9.1.1 Designation for Tapped Hole. The drawing notefor the STI-threaded hole per Table 1 to accept the helicalcoil insert shall be in accordance with the followingexample:EXAMPLE: M8 H11547 1.25-5H STI; 23.5 T per ASME B18.29.2M.2BottomingstyletapPlugstyletap2 pitchincomple
