1、AN AMERICAN NATIONAL STANDARD ASME B18.2.6M-2012Revision, redesignation, and consolidation ofASME B18.2.3.7M-1979 (R2006) and ASME B18.2.4.6M-2010Metric Fasteners for Use in Structural ApplicationsASME B18.2.6M-2012Revision, redesignation, and consolidation ofASME B18.2.3.7M-1979 (R2006) and ASME B1
2、8.2.4.6M-2010Metric Fastenersfor Use inStructuralApplicationsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: March 23, 2012This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning
3、interpretations of technical aspects of thisStandard. 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.Errata to codes and standards may
4、 be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items, or to correct typographical or grammatical errorsin codes and standards. Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/. There is
5、an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.This option can be found on the appropriate Committee Page after selecting “Errata” in the “PublicationInformation” section.ASME is the registered trademark of The American Soci
6、ety 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 opp
7、ortunity 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” any item, construction, p
8、roprietary 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 p
9、atent, nor assumes 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) affili
10、ated 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
11、 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 2012 byTHE AMERICAN SOCIETY OF M
12、ECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B18 Committee vi1 Introduction . 12 Metric Heavy Hex Structural Bolts: ASTM A325M and ASTM A490M. 23 Metric Heavy Hex Nuts: ASTM A563M . 54 Metric Hardened Steel Washers: ASTM F436M
13、. 65 Metric Compressible Washer-Type Direct Tension Indicators: ASTM F959M. 7Tables1 Dimensions of Metric Heavy Hex Structural Bolts . 22 Maximum Grip Gaging Lengths and Minimum Body Lengths for Metric HeavyHex Structural Bolts 43 Dimensions of Metric Heavy Hex Nuts for Use With Structural Bolts 64
14、Dimensions of Metric Hardened Steel Circular and Circular Clipped Washers 75 Dimensions for Metric Compressible Washer-Type Direct Tension Indicators 8iiiFOREWORDIn the spring of 2010, the B18 Committee decided that a metric version of ASME B18.2.6,Fasteners for Use in Structural Applications, shoul
15、d be created for fastener guidance on metricstructural fasteners used in North America. This Standard, ASME B18.2.6M, is the result of thateffort. It was decided that since there were not yet any ASTM material and testing standards fortwist-off bolts, their dimensions should not be included in this
16、initial edition of this Standard.This Standard does include the dimensions for metric structural bolts, metric heavy hex nuts,metric structural washers, and metric compressible-washer-type direct tension indicators.Suggestions for improvement of this Standard are welcome. They should be addressed to
17、 theSecretary, ASME B18 Standards Committee, Three Park Avenue, New York, NY 10016-5990.This Standard was approved as an American National Standard on February 9, 2012.ivASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws, Washers, andSimilar Fasteners(The following is the roster of the
18、 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, ConsultantD. A. Clever, ConsultantA. P. Cockman, Ford Motor Co.C. A. Dugal, TSPJ. S. Foo
19、te, Contributing Member, Trade Association Management,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 Member, Defense Supply
20、 CenterA. 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 2 EXTERNALLY DRIVEN FASTENERSJ. Greenslade, Chair, Industri
21、al Fasteners InstituteC. B. Williamson, Vice Chair, Fastenal Co.V. Cartina, ConsultantL. Claus, ATF, Inc.D. A. Clever, ConsultantA. P. Cockman, Ford Motor Co.C. A. Dugal, TSPB. A. Dusina, Federal Screw WorksM. A. Elmi, ConsultantJ. S. Foote, Trade Association Management, Inc.D. S. George, ND Industr
22、iesA. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.J. Hubbard, Leland-Powell Fasteners, Inc.J. Jennings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.vW. H. Kopke, ConsultantW. J. Lutkus, Emhart TeknologiesD. A. McCrindle, Canadian Fasteners Institut
23、eM. D. Prasad, Contributing Member, GlobalM however, they shouldnot contain proprietary names or information.Requests that arenot in this format may berewritten in the appropriate formatby the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME pr
24、ocedures 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 ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endo
25、rse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B18 Standards Committee regularly holds meetings thatare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Standards Committee.viASME B18.2.6M-2012METRIC FAST
26、ENERS FOR USE IN STRUCTURAL APPLICATIONS1 INTRODUCTION1.1 Scope1.1.1 This Standard covers the complete generaland dimensional data for products in the metric seriesrecognizedasAmericanNationalStandardforsizesM12through M36. These four metric structural productsinclude(a) metric heavy hex structural
27、bolts: ASTM A325Mand ASTM A490M(b) metric heavy hex nuts: ASTM A563M(c) metric hardened steel washers; circular, circularclipped, and beveled: ASTM F436M(d) metric compressible washer-type direct tensionindicators: ASTM F959M1.1.2 The inclusion of dimensional data in thisStandard is not intended to
28、imply that all productsdescribed herein are stock production sizes. Consumersshould consult with suppliers concerning lists of avail-able stock production sizes.1.2 DimensionsAll dimensions in this Standard are in millimeters,unless stated otherwise, and apply to unplated oruncoated product. When pl
29、ating or coating is specified,the finished product dimensions shall be as agreed uponbetween supplier and purchaser. Symbols specifyinggeometric characteristics are in accordance withASME Y14.5.1.3 OptionsOptions, where specified, shall be at the discretionof the supplier, unless otherwise agreed up
30、on by thepurchaser and supplier.1.4 TerminologyFor definitions of terms relating to fastener dimen-sional or component features used in this Standard, referto ASME B18.12.1.5 Comparison to ISO and CEN StandardsISO 4775 is similar to the nut in this Standard.ISO 7415 is similar to the structural wash
31、er in thisStandard.There are no comparable ISO standards for compress-ible indicating washers.1CEN 14399 is a similar standard for structural fasten-ers including hex bolts, heavy hex nuts, structural wash-ers, and compressible indicating washers.1.6 Referenced StandardsUnless otherwise specified, t
32、he referenced standardshall be the most recent issue.ASME B1.3, Screw Thread Gaging Systems forAcceptability Inch and Metric Screw Threads (UN,UNR, UNJ, M, and MJ)ASME B1.13M, Metric Screw ThreadsMProfileASME B1.16M, Gages and Gaging for Metric M ScrewThreadsASME B18.2.4.6M, Metric Heavy Hex NutsASM
33、E B18.2.9, Straightness Gage and Gaging for Boltsand ScrewsASME B18.12, Glossary of Terms for MechanicalFastenersASME B18.18, Quality Assurance for FastenersASME B18.24, Part Identifying Number (PIN) CodeSystem for B18 Fastener ProductsASME Y14.5-2009, Dimensioning and TolerancingPublisher: The Amer
34、ican Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive, P.O.Box 2900, Fairfield, NJ 07007-2900 (www.asme.org)ASTM A325M, Structural Bolts, Steel, Heat Treated 830MPa Minimum Tensile Strength (Metric)ASTM A490M, High Strength Steel Bolts,
35、 Classes 10.9and 10.9.3, for Structural Joints (Metric)ASTM A563M, Carbons and Alloy Steel Nuts (Metric)ASTM B695, Coatings of Zinc Mechanically Depositedon Iron and SteelASTM F436M, Hardened Steel Washers (Metric)ASTM F788/F788M, Surface Discontinuities of Bolts,Screws, and Studs, Inch and Metric S
36、eriesASTM F812/F812M, Surface Discontinuities of Nuts,Inch and Metric SeriesASTM F959M, Compressible Washer Type DirectTension Indicators for Use With Structural Fasteners(Metric)ASTM F2674, Zinc Coating, Hot-Dip, Requirements forApplication to Carbon and Alloy Steel Bolts, Screws,Washers, Nuts, and
37、 Special Threaded Fasteners(Metric)Publisher: American Society for Testing and Materials(ASTMInternational), 100Barr HarborDrive, P.O.BoxASME B18.2.6M-2012Table 1 Dimensions of Metric Heavy Hex Structural BoltsCut Thread Rolled ThreadRSee para. 2.1.6LSLGLLTLSLGLLTSee para. 2.1.6See para. 2.1.14See p
38、ara. 2.1.14FGH RHEE2.1.15 2.1.15(Ref)(Ref)Y (Ref) Y (Ref)BodyMinimum Maximum MaximumDiameter, Head Height,Fillet Thread Transition Runout ofE AF, F AC, GHRadius, Length, Thread Length, BearingPitch Max. Min. Max. Min. Max. Min. Max. Min. RLT, Ref. Y, Ref. Surface FIMM12 H11547 1.75 12.70 11.30 21.00
39、 20.16 24.25 22.78 7.95 7.05 0.60 25 5.2 0.4M16 H11547 2 16.70 15.30 27.00 26.16 31.18 29.56 10.75 9.25 0.60 31 6.0 0.5M20 H11547 2.5 20.84 19.16 34.00 33.00 39.26 37.29 13.40 11.60 0.80 36 7.5 0.6M22 H11547 2.5 22.84 21.16 36.00 35.00 41.57 39.55 14.90 13.10 0.80 38 7.5 0.6M24 H11547 3 24.84 23.16
40、41.00 40.00 47.34 45.20 15.90 14.10 1.00 41 9.0 0.7M27 H11547 3 27.84 26.16 46.00 45.00 53.12 50.85 17.90 16.10 1.20 44 9.0 0.8M30 H11547 3.5 30.84 29.16 50.00 49.00 57.74 55.37 19.75 17.65 1.20 49 10.5 0.9M36 H11547 4 37.00 35.00 60.00 58.80 69.28 66.44 23.55 21.45 1.50 56 12.0 1.0GENERAL NOTE: See
41、 Table 2 for LGand LSdimensions.C700, West Conshohocken, PA 19428-2959 (www.as-tm.org)2 METRIC HEAVY HEX STRUCTURAL BOLTS: ASTMA325M AND ASTM A490M2.1 Metric Heavy Hex Structural Bolt DimensionsBolts shall conform to the dimensions given in Table 1.2.1.1 Top of Head. The top of the head shall be ful
42、lform and chamfered or rounded with the diameter ofthe chamfer circle, or start of rounding being equal tothe maximum width across flats within a tolerance of15% of the maximum across flats dimension.2.1.2 Width Across Flats. The width across flats ofheads shall be the distance measured perpendicula
43、r tothe axis of product, overall between two opposite sidesof the head.2.1.3 Head Taper. The maximum width across flatsshall not be exceeded. No transverse section throughthe head between 25% and 75% of actual head height,as measured from the bearing surface, shall be less thanthe minimum width acro
44、ss flats.2.1.4 Head Height. The head height shall be thatoverall distance measured parallel to the axis of theproduct from the top of the head to the bearing surfaceand shall include the thickness of the washer face. The2raised grade and the manufacturers identification areexcluded from the head hei
45、ght.2.1.5 Position of Head. The runout of the flats ofthe head shall be no greater than 6% of the maximumwidth across flats. For referee purposes, the evaluationshall be made by indicating on the flats while holdingthe body one bolt diameter from under the head androtating the part.2.1.6 Bearing Sur
46、face. Bearing surface shall be flatand washer faced. However, a die seam across the bear-ing face shall be permissible. The diameter of the washerface shall be equal to the maximum width across theflats with a minus tolerance of 10%. The thickness ofthewasherfaceshallbenotlessthan0.04mmnorgreatertha
47、n 0.08 mm. The plane of the bearing surface shall beperpendicular to the axis of the body within the FIMlimits specified for total runout. The measurement ofFIM shall extend as close to the periphery of the bearingsurface as possible while the bolt is being held in acollet or other gripping device a
48、t a distance of one boltdiameter from the underside of the head. The angularitymeasurement shall be taken at a location to avoid inter-ference from a die seam.2.1.7 Body Diameter. The body diameter limits areshown in Table 1. Any swell or fin under the head orany die seam on the body shall not excee
49、d the basic boltdiameter by the following:ASME B18.2.6M-2012(a) 1.25 mm for M12 and M16(b) 1.5 mm for M20 through M30(c) 2.30 mm for M362.1.8 Bolt Length. The bolt length shall be the dis-tance measured parallel to the axis of the product fromthe bearing surface of the head to the extreme end ofthe bolt including point. Bolts are normally furnishedin 5 mm length increments through 100 mm and 10 mmincrements over 100 mm.2.1.9 Length Tolerance. Bolt length tolerances shallbe as tabulated below.Size M12 M16 M20 M22 M24 M27 M30 M36Length 150 mm 3.0 3.0 4.0 4.0 4.0 6.0 6.
