1、AN AMERICAN NATIONAL STANDARDASME B18.29.1-2010Revision of ASME B18.29.1-1993 (R2007)Helical Coil Screw Thread Inserts Free Running and Screw Locking (Inch Series)INTENTIONALLY LEFT BLANKASME B18.29.1-2010Revision of ASME B18.29.1-1993 (R2007)Helical Coil ScrewThread Inserts FreeRunning and ScrewLoc
2、king (Inch Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: August 16, 2010This 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 conce
3、rning interpretations of technical aspects of thisdocument. Periodically, certain actions of the ASME B18 Committee may be published as Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trad
4、emark 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
5、 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 from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse”
6、 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 o
7、f 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 representati
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9、suance 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 2010 by
10、THE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B18 Committee vi1 Introductory Notes . 12 STI Tapped Hole . 23 Helical Coil Insert 24 Inspection and Quality Assurance . 3Figure1 Insert Configuration 5Table
11、s1 STI Threaded Hole Data 62 Chemical Composition 93 Insert Length Data . 104 Insert Dimensions 125 Self-Locking Torque 14Nonmandatory AppendicesA Insert Length Selection . 15B Screw Thread Insert Taps . 16C STI Thread Plug Gages . 17D Installation . 18iiiFOREWORDAlthough this is the first ASME stan
12、dard covering helical coil screw thread inserts, they havebeen in use for many years. The helical coil screw thread insert was invented in the 1930s andfound initial acceptance in aircraft manufactured and serviced by the Allied Air Forces duringWorld War II.Since that time, applications for helical
13、 coil inserts have come into broad usage in aerospace,automotive, and industrial original equipment design, production salvage (repair), and in-servicerepair.Although this usage did include metric spark plug sizes, the regular metric series was delineatedin Europe in the 1950s, and came into product
14、ion in the inch-using countries in the 1960s.Subcommittee 29, Threaded Inserts, met initially in May 1989 after authorization by the ASMEB18 Committee to proceed with development of standards covering screw thread inserts.Following approval by the B18 Committee, the proposal was submitted to the Ame
15、rican NationalStandards Institute for approval. The 1993 edition was approved by ANSI on February 4, 1993.In 2008, an update of this Standard was initiated by the ASME B18.29 Subcommittee. Afterneeded revisions and additions were clearly identified, ballots were properly undertaken. Ballotsresulted
16、in changes related to the ballot comments. In 2009, this Standard was approved by theB18.29 Subcommittee and the B18 Committee.This revision was approved by the American National Standards Institute (ANSI) onFebruary 25, 2010.ivASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers
17、, and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSJ. Greenslade, ChairD. S. George, Vice ChairR. D. Strong, Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Autocraft IndustrialD. A. Clev
18、er, ConsultantA. P. Cockman, Ford Motor Co.C. A. Dugal de la Garza, TSP, Inc.D. S. George, ND IndustriesC. J. Gomez, The American Society of Mechanical EngineersJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Contributing Member, Fastener Consulting Services, Inc.B. Hasiuk, Contributing Mem
19、ber, Defense Supply CenterPhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Leland-Powell Fasteners, Inc.J. Jennings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.J. F. Koehl, Contributing Member, Spirol International Corp.SUBCOMMITTEE 29 THREADED INSERTSA. L. Guz
20、man, Secretary, The American Society of MechanicalEngineersR. L. Davis, Kato Fastening Systems, Inc.D. S. George, ND IndustriesW. Giannakakos, Black however, they shouldnot contain proprietary names or information.Requests that are not in this format may be rewritten in the appropriate format by the
21、 Committeeprior to being 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
22、 appeal to the cognizant 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
23、 attend any meeting should contact the Secretary ofthe B18 Standards Committee.viASME B18.29.1-2010HELICAL COIL SCREW THREAD INSERTSFREE RUNNING AND SCREW LOCKING(INCH SERIES)1 INTRODUCTORY NOTES1.1 Scope1.1.1 This Standard delineates the dimensionaldata for the inch series helical coil screw thread
24、 insertsand the threaded holes into which they are installed.Both free-running and screw-locking types having uni-fied fine and unified coarse thread series from size #1through 112in. are covered. Appendices that describeinsert selection, STI (screw thread insert) taps, gagesand gaging, insert insta
25、llation, and removal tooling arealso included.1.1.2 The inclusion of dimensional data in thisStandard is not intended to imply that all productsdescribed are stock sizes. Consumers should consultwith manufacturers concerning availability.1.2 ReferencesThe latest editions of the following documents f
26、orma part of this Standard to the extent specified herein.Army A-A-59158, Tools for Inserting and ExtractingHelical Coil Wire Screw Thread InsertsPublisher: IHS Inc., 15 Inverness Way East, Englewood,CO 80112 ()ASME B1.1, Unified Inch Screw Threads (UN andUNR Thread Form)ASME B1.2, Gages and Gaging
27、for Unified Inch ScrewThreadsASME B1.3, Screw Thread Gaging Systems forAcceptability Inch and Metric Screw Threads (UN,UNR, UNJ, M, and MJ)ASME B18.18.2, Inspection and Quality Assurance forHigh-Volume Machine Assembly FastenersASME B46.1, Surface Texture, Surface Roughness,Waviness, and LayASME B47
28、.1, Gage BlanksASME B94.9, Taps: Ground and Cut ThreadsASME Y14.5M, Dimensioning and TolerancingASME Y14.36, Surface Texture SymbolsPublisher: The American Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016; Order Department: 22 Law Drive, P.O.Box 2900, Fairfield, NJ 07007-2
29、900 (www.asme.org)1ASTM E 290, Standard Test Methods for Bend Testingof Material for DuctilityASTM B 209-02, Standard Specification for Aluminumand Aluminum-Alloy Sheet and PlateASTM A 370, Standard Test Methods and Definitionsfor Mechanical Testing of Steel ProductsPublisher: American Society for T
30、esting and Materials(ASTM International), 100 Barr Harbor Drive,P.O. Box C700, West Conshohocken, PA 19428(www.astm.org)SAE AMS4120, Aluminum Alloy, Rolled or ColdFinished Bars, Rods, and Wire, 4.4Cu1.5Mg0.60Mn(2024), Solution Heat Treated and Naturally Aged(T4), Solution Heat Treated, Cold Worked,
31、andNaturally Aged (T351)SAE AS5272, Lubricant, Solid Film, Heat Cured,Corrosion Inhibiting Procurement SpecificationSAE AS8879, Screw Threads UNJ Profile, InchControlled Radius Root with Increased MinorDiameterSAE J417, Hardness Tests and Hardness NumberConversions.Publisher: Society of Automotive E
32、ngineers (SAEInternational), 400 Commonwealth Drive,Warrendale, PA 15096-0001 (www.sae.org)1.3 DescriptionHelical coil inserts are screw thread bushings coiledfrom wire of diamond shaped cross-sections. The insertsare screwed into STI tapped holes to form nominal sizeinternal threads. Inserts are in
33、stalled by torquingthrough a diametral tang. This tang is notched forremoval after installation.In the free state, the inserts are larger in diameter thanthe tapped hole into which they are installed. In theassembly operation, the torque applied to the tangreduces the diameter of the leading coil an
34、d permits itto enter the tapped thread. The remaining coils arereduced in diameter as they, in turn, are screwed intothe tapped hole. When the torque or rotation is stopped,the coils expand with a spring-like action, anchoring theinsert in place against the tapped hole.ASME B18.29.1-20101.4 Class of
35、 FitSince 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 toleranceClasses 2B and 3B tapped holes. Tolerance Class 2Btapped holes provide maximum production tolerances,but result in low
36、er locking torques when screw lockinginserts are used. The higher and more consistent torquesgiven in Table 5 are met by the screw locking insertswhen assembled and tested in tolerance Class 3B tappedholes in accordance with section 2.1.5 CompatibilityAssembled helical coil inserts will mate properl
37、y withitems having UN external threads in accordance withASME B1.1. In addition, due to the radius on the crestof the insert at the minor diameter, the assembled insertwill mate with UNJ profile external threaded parts withcontrolled radius root threads per SAE AS8879.1.6 Types of Inserts1.6.1 Free-
38、Running. The free-running insert pro-vides a smooth, hard, and free-running thread.1.6.2 Screw-Locking. The screw-locking insert pro-vides a resilient locking thread produced by a series ofchords on one or more of the insert coils.2 STI TAPPED HOLEThe tapped hole into which the insert is installed s
39、hallbe in accordance with ASME B1.1, except that diametersare larger to accommodate the wire cross-section of theinsert. Dimensions of the STI tapped holes are shownin Table 1 and calculated per Note (3) of Table 1.2.1 Screw Thread Designation2.1.1 Designation for Tapped Hole. The drawingnote for th
40、e STI threaded hole per Table 1 to acceptthe helical coil insert shall be in accordance with thefollowing example:EXAMPLE:14-20 UNC-2B STI thread 0.430 min. depth, perASME B18.29.1.2.1.2 Designation for a Helical Coil Insert. Designa-tion of the helical coil insert on parts lists, spares lists,purch
41、ase orders, etc., shall be in accordance with thefollowing examples:EXAMPLES:(1) ASME B18.29.1,14-20 UNC 0.375 long helical coilfree-running insert.(2) ASME B18.29.1, #10-32 UNF 0.380 long helical coilscrew-locking insert.2.1.3 Designation for STI Threaded Hole IncludingInstalled Helical Coil Insert
42、. The drawing note for theSTI threaded hole per Table 1, having a helical coil insert2installed, shall be in accordance with the followingexample:EXAMPLES:(1)14-20 UNC-2B STI thread 0.430 deep.(2) ASME B18.29.1,14-20 UNC 0.375 long helical coilfree-running insert.2.2 Gages and GagingAcceptance of th
43、e threaded hole is determined bygaging with STI GO, NOT GO (HI), and plain cylindricalgages designed and applied in accordance withSystem 21 of ASME B1.3 (see NonmandatoryAppendix C).3 HELICAL COIL INSERT3.1 Insert MaterialChemical composition of the inserts is austenitic cor-rosion resistant (stain
44、less) steel within the limits ofTable 2.3.2 Properties3.2.1 Tensile Strength. Wire, before coiling intoinserts, shall have tensile strength not lower than150,000 psi, determined in accordance with ASTM A 370.3.2.2 Bending. Wire shall withstand, without crack-ing, bending in accordance with ASTM E 29
45、0 at roomtemperature through an angle of 180 deg around a diam-eter equal to twice the cross-sectional dimension of thewire in the plane of the bend.3.2.3 Workmanship. The formed wire shall be ofuniform quality and temper; smooth, clean, free fromkinks, waviness, splits, cracks, laps, seams, scale,
46、segre-gation, and other defects that may impair the serviceabil-ity of the insert.3.3 Coatings3.3.1 Red Dye Identification. Screw-locking insertsare dyed red for identification. The red dye may com-pletely or partially cover the insert. However, it mustbe sufficient to identify the insert when it is
47、 installed inthe tapped hole.3.3.2 Dry Film Lubricant Coating. When specified,dry film lubricant coating can be applied to helical coilinserts. It shall meet the requirements of para. 3.3.2.1and para. 3.3.2.2. Color of dry film lubricated insert isdark gray to black.3.3.2.1 Dry Film Material. The lu
48、bricant shall meetthe requirements of SAE AS5272, Type I.3.3.2.2 Thickness. The coating shall be uniformlydeposited on the insert with minimum thickness beingcomplete coverage. The maximum thickness shall bethe avoidance of “bridging” between coils. Slight fill-inASME B18.29.1-2010between closely wo
49、und coils that immediately separateas the coils are axially pulled apart by hand, shall notbe considered “bridging.”3.4 Configuration and DimensionsInsert configurations shall be in accordance withFig. 1, and dimensions shall be in accordance withTables 3 and 4.3.4.1 Nominal Length. Each nominal insert size isstandardized in five lengths which are multiples of theinserts nominal diameter. These are 1, 112,2,212, and3 times nominal diameter.Each nominal length is the minimum through-holelength (material thickness), without countersink, intowhich that in
