1、ASME B18.2.3.9M-2001Revision of ASME B18.2.3.9M-1984 (R1995)METRIC HEAVYHEX FLANGESCREWSAN AMERICAN NATIONAL STANDARDRevision of ANSI/ASME B18.2.3.9M-1984 (R1995)REAFFIRMED 2014FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgIntentionally left blank AN AMERICAN NATIONAL STANDARDMETRIC HEAVYHE
2、X FLANGESCREWSASME B18.2.3.9M-2001Revision of ANSI/ASME B18.2.3.9M-1984 (R1995)Date of Issuance: September 17, 2001This 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 concer
3、ning interpretations 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
4、 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,regula
5、tory 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 with any items mentioned in this document, and does not
6、undertake to insure anyoneutilizing 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
7、, 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 inac
8、cordance 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 o
9、f Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2001 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.FOREWORDAmerican National Standards Committee B18 for the standardization of bolts, screws,nuts, rivets, and similar fasteners was organize
10、d 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 ofAu
11、tomotive Engineers and the American Society of Mechanical 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 pre
12、paration of a seriesof standards for metric fasteners. Subcommittee 2 was assigned responsibility for developingstandards for metric hex bolts, screws, and nuts.Following issuance of ANSI B18.2.3.4M-1979, interest developed in the farm equipment,heavy truck, and off-road vehicles industries for a se
13、cond series of metric hex flange screwshaving a head widths across flats series equal to those of metric hex cap screws. Duringthe analytical research study to optimize head proportions of hex flange screws (refer tothe Foreword of ASME B18.2.3.4M-2000), this larger head series was also investigated
14、,and appropriate values for the various head characteristics were established for screw sizesM10 through M20.This new design of metric heavy hex flange screws was submitted by the United Statesof America/Canada to ISO/TC2 at its May 1982 meetings. TC2 accepted the proposal andauthorized development
15、of International Organization for Standardization (ISO) standards.After these ISO decisions, Subcommittee 2 drafted this Standard.This Standard was approved by letter ballot of the ASME B18 Standards Committee onApril 18, 1983, and was subsequently approved by the American Society of MechanicalEngin
16、eers and submitted to the American National Standards Institute for designation asan American National Standard. This was granted on March 23, 1984. The Standard wasreaffirmed in 1995. This draft revision was prepared based on revisions that were made inthe metric hex cap screw standard in December
17、1998. This Standard was approved by theAmerican National Standards Institute on March 9, 2001. The key revisions include thefollowing:(a) The heavy hex series is expanded to include sizes M5, M6, and M8 with headdimensions adopted by ISO/DIS 8102.(b) All head heights (K) and wrenching heights (Kw) a
18、re increased to improve wrenchability.(c) The position of head-to-shank is changed to maximum material condition (MMC) asdescribed in para. 11 and Tables 2 and 5.(d) The length tolerances are changed in Table 7 to agree with those of the draft ofASME B18.2.3.4M, Metric Hex Flange Screws.(e) Straight
19、ness is specified at MMC, and a rail gage replaces the sleeve gage as specifiedin para. 18.(f) The concavity angle of the conical bearing surface is now 0.75 deg 0.50 deg toagree with that of ISO and to match B18.2.3.4M. The bearing face runout is to be measuredon the actual bearing circle instead o
20、f the minimum bearing circle as specified in para. 13.(g) The transition threads shall have a rounded root contour per para. 20.4. This replaces,iii“For screws of Property Class 10.9 and higher strength materials (tensile strength 1040MPa and higher) the transition threads shall have a rounded root
21、contour no radius ofwhich shall be less than the specified minimum at the root of the full form thread.”(h) The position of body-to-thread previously required is deleted based on the B18Subcommittee 2 decision of December 2, 1998.(i) Appendix A is added to provide a detailed comparison with ISO/DIS
22、8102, withunpublished changes agreed upon in ISO/TC2/WG2. The current wrenching height formulain ISO 4759-1 would increase the wrenching heights even more. No support exists in NorthAmerica for increases beyond those included herein.ivASME B18 STANDARDS COMMITTEEStandardization of Bolts, Nuts, Rivet
23、s, Screws,Washers, and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSD. A. Clever, ChairR. D. Strong, Vice ChairS. W. Vass, Vice ChairR. L. Crane, SecretaryCOMMITTEE PERSONNELJ. Altman, Rotor Clip Co.J. H. Slass, Alternate, Rotor Cli
24、p Co.J. B. Belford, Lawson Products, Inc.J. A. Buda, SPS TechnologiesR. M. Byrne, Trade Association Management, Inc.D. 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.
25、 A. Dusina, Federal Screw WorksD. S. George, Ford Motor Co.D. L. Drobnich, Alternate, Ford Motor Co.J. Greenslade, Greenslade and Co.B. Hasiuk, Defense Industrial Supply CenterA. Herskovitz, U.S. ArmyJ. Hubbard, Rockford Fastener, Inc.D. F. Kattler, SPS TechnologiesJ. F. Koehl, Spirol International
26、Corp.W. H. Kopke, ITW Shakeproof Assembly Co.M. Levinson, Alternate, ITW Shakeproof Assembly Co.J. G. Langenstein, ConsultantD. Liesche, Defense Industrial Supply CenterL. L. Lord, Caterpillar, Inc.R. L. Tennis, Alternate, Caterpillar, Inc.D. B. Mantas, GEEmpisA. D. McCrindle, Genfast Manufacturing
27、Co.K. E. McCullough, ConsultantR. B. Meade, Textron Fastening SystemsM. D. Prasad, General Motors Corp.S. Savoji, ITW MedalistW. Schevey, BGM Fastener Co., Inc.R. D. Strong, General Motors Corp.J. F. Sullivan, National Fasteners Distribution AssociationR. Torres, Action Threaded ProductionS. W. Vass
28、, Industrial Fasteners InstituteC. B. Wackrow, MNP Corp.R. G. Weber, Fairfield UniversityvW. K. Wilcox, Naval Sea SystemsC. J. Wilson, Industrial Fasteners InstituteD. R. Akers, Alternate, Industrial Fasteners InstituteR. B. Wright, Wright Tool Co.J. G. Zeratsky, Tubular and Machine InstituteSUBCOMM
29、ITTEE 2 EXTERNALLY DRIVEN FASTENERSS. W. Vass, Chair, Lake Erie Screw Corp./Industrial Fasteners InstituteR. L. Crane, Secretary, The American Society of Mechanical EngineersH. S. Brenner, Almay Research and TestingR. M. Byrne, Trade Association Management, Inc.M. M. Chu, Nucor FastenerD. A. Clever,
30、 Deere and Co.A. P. Cockman, Ford Motor Co.R. J. Corbett, Huck InternationalE. R. Cossairt, Hill Fastener Corp.D. L. Drobnich, Ford Motor Co.B. A. Dusina, Federal Screw WorksD. S. George, Ford Motor Co.J. Greenslade, Greenslade and Co.A. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.J. H
31、ubbard, Rockford Fastener, Inc.D. F. Kattler, SPS TechnologiesD. Liesche, Defense Industrial Supply CenterL. L. Lord, Caterpillar, Inc.D. B. Mantas, GEEmpisA. D. McCrindle, Genfast Manufacturing Co.K. E. McCullough, ConsultantR. B. Meade, Textron Fastening SystemsS. Savoji, ITW MedalistJ. A. Schlink
32、, Caterpillar, Inc.D. F. Sharp, Turnasure LLCW. R. Stevens, MacLeanFogg FasteningR. D. Strong, General Motors Corp.J. F. Sullivan, National Fasteners Distribution AssociationD. M. Sutula, Industrial Fasteners InstituteR. L. Tennis, Caterpillar, Inc.R. Torres, Action Threaded ProductsC. B. Wackrow, M
33、NP Corp.W. L. Wilcox, Naval Sea SystemsC. J. Wilson, Industrial Fasteners InstituteviCORRESPONDENCE WITH 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 theCommittee
34、by requesting interpretations, proposing revisions, and attending Committeemeetings. Correspondence 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
35、 Standard to incorporatechanges that appear necessary or desirable, as demonstrated by the experience gained fromthe application of the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals shouldbe as specific as
36、possible, citing the paragraph number(s), the proposed wording, and adetailed description of the reasons for the proposal, including any pertinent documentation.Interpretations. Upon request, the B18 Committee will render an interpretation of anyrequirement of the Standard. Interpretations can only
37、be rendered in response to a writtenrequest sent to 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)
38、and the topic of the inquiry.Edition: Cite the applicable edition of the Standard for which the interpretationis being requested.Question: Phrase the question as a request for an interpretation of a specificrequirement suitable for general understanding and use, not as a requestfor an approval of a
39、proprietary design or situation. The inquirer mayalso include any plans or drawings which are necessary to explainthe question; however, they should not contain proprietary names orinformation.Requests that are not in this format will be rewritten in this format by the Committeeprior to being answer
40、ed, 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 byan interpretation may appeal to the cognizant ASME C
41、ommittee or Subcommittee. ASMEdoes not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device,or activity.Attending Committee Meetings. The B18 Standards Committee regularly holds meetings,which are open to the public. Persons wishing to attend any meeting should conta
42、ct theSecretary of the B18 Standards Committee.viiCONTENTSForeword . iiiStandards Committee Roster vCorrespondence With the B18 Committee . vii1 Scope . 12 Comparison With ISO/DIS 8102 13 Referenced Standards 14 Terminology 25 Dimensions . 26 Top of Head 27 Head Height 28 Wrenching Height 29 Corner
43、Fill 210 Gaging of Heavy Hex Flange Head . 211 Position of Head 212 Flange 213 Bearing Surface . 214 Fillet 315 Body Diameter 316 Length 417 Points . 418 Straightness 519 Threads . 520 Thread Length 721 Materials and Mechanical Properties . 922 Identification Symbols . 923 Finish . 1024 Workmanship
44、. 1025 Inspection and Quality Assurance 1026 Dimensional Conformance . 10viii27 Clearance Holes 1028 Designation . 10Tables1 Gaging of Heavy Hex Flange Heads 32 Tolerance Zones 33 Dimensions of Type F Underhead Fillets 44 Dimensions of Type U Underhead Fillets 55 Dimensions of Heavy Hex Flange Screw
45、s . 66 Dimensions of Reduced Body Diameter (Type R) 77 Length Tolerances 78 Dimensions of Points . 79 Maximum Grip Gaging Lengths, Lg, and Minimum Body Lengths, Ls. 810 Thread Lengths . 9Nonmandatory AppendicesA Comparison With ISO Standards 11B Screw Straightness Gage and Gaging Procedure 13ixInten
46、tionally left blank ASME B18.2.3.9M-2001METRIC HEAVY HEX FLANGE SCREWS1 SCOPE(a) This Standard covers the complete dimensionaland general data for metric series heavy hex flangescrews recognized as American National Standard.(b) The inclusion of dimensional data in this Standardis not intended to im
47、ply that all products describedare stock production items. Consumers should consultwith suppliers concerning availability of products.2 COMPARISON WITH ISO/DIS 8102(a) Heavy hex flange screws as presented in thisstandard are harmonized to the extent possible withthe draft international standard ISO/
48、DIS 8102, HexagonBolts With FlangeHeavy Series, and with revisionsagreed to by ISO/TC2/WG2 in May 1989 in Zurichand later that have not been published in a reviseddraft. If it were published, the dimensional differencesbetween this Standard and ISO/DIS 8102 would befew, relatively minor, and none wo
49、uld affect functionalinterchangeability of screws manufactured to the require-ments of either.This Standard specifies some requirements that are notincluded in ISO/DIS 8102. Dimensional requirementsshown in bold type are in addition to, or differfrom, ISO/DIS 8102. The technical differences betweenthis standard and the ISO documents are described inAppendix A.(b) Letter symbols designating dimensional charac-teristics are in accord with ISO 225, FastenersBolts,Screws, Studs and NutsSymbols and Designations ofDimensions, and with ISO/DIS 8102, except wherecapitals have been us
