1、AN AMERICAN NATIONAL STANDARDASME B18.2.2-2010Revision of ASME/ANSI B18.2.2-1987 (R2005)Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)INTENTIONALLY LEFT BLANKASME B18.2.2-2010Revision of ASME/ANSI B18.2.2-1987 (R2005)Nuts for GeneralApplic
2、ations: MachineScrew Nuts, Hex,Square, Hex Flange,and Coupling Nuts(Inch Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: November 30, 2010This Standard will be revised when the Society approves the issuance of a new edition. There willbe no addenda issue
3、d to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Periodically certain actions of the ASME B18 Committee may be published as Cases. Casesand interpretations are published on the ASME Web site under the Committee Pages athttp:/
4、cstools.asme.org 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
5、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 from industry, academia,regulatory agencies, and th
6、e 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
7、anyone utilizing a standard against liability forinfringement of any applicable letters patent, 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
8、 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
9、 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 Engi
10、neersThree Park Avenue, New York, NY 10016-5990Copyright 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B18 Committee vii1 Introduction 12 References 13 General Data 1Tables1-1 Dimensions of Squar
11、e and Hex Machine Screw Nuts 41-2 Dimensions of Small Pattern Hex Machine Screw Nuts . 52 Dimensions of Square Nuts 63 Dimensions of Hex Flat Nuts and Hex Flat Jam Nuts . 74 Dimensions of Hex Nuts and Hex Jam Nuts 85 Dimensions of Hex Slotted Nuts . 96 Dimensions of Hex Thick Nuts . 107 Dimensions o
12、f Hex Thick Slotted Nuts . 118 Dimensions of Heavy Square Nuts . 129 Dimensions of Heavy Hex Flat Nuts and Heavy Hex Flat Jam Nuts . 1310 Dimensions of Heavy Hex Nuts and Heavy Hex Jam Nuts 1411 Dimensions of Heavy Hex Slotted Nuts 1512 Dimensions of Hex Flange Nuts and Large Hex Flange Nuts 1613 Di
13、mensions of Hex Coupling Nuts . 17Mandatory AppendixI Slot Gages and Gaging for Slotted Nuts 19Nonmandatory AppendicesA Formulas for Nut Dimensions 21B Wrench Openings for Square and Hex Nuts 24iiiFOREWORDAmerican National Standards Committee B18 for the standardization of bolts, screws, nuts,rivets
14、, and similar fasteners was organized in March 1922 as Sectional Committee B18 underthe aegis of the American Engineering Standards Committee (later the American StandardsAssociation, then the United States of America Standards Institute, Inc.) with the Society ofAutomotive Engineers and the America
15、n 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.Subcommittee2,afterappraisaloftherequirementsofindustry,developedaproposedstandardseries of bolt h
16、ead and nut dimensions. This proposal was finally approved and designated aTentative American Standard in February 1927.A first revision of the document was designated as an American Standard in March 1933 andwas followed by a second revision that was granted approval as an American Standard inJanua
17、ry 1941.Following reorganization of the B18 Committee in 1947, Subcommittee 2 was asked to expandthe standard on head proportions into a complete product standard. A proposal covering squareand hexagon head bolts and nuts, hexagon head cap screws, and automotive hexagon head boltswas prepared and su
18、bmitted to the B18 Committee in April 1950. While this draft was underconsideration, the B18 Committee received a proposal from the British Standards Institutionfor unification of dimensions on products incorporating unified screw threads. The Committeewelcomed the opportunity of discussing the prop
19、osals and an American-British-CanadianConference was held in New York on June 1 and 2, 1950.It was agreed in the conference that the essentials of unification could be accomplished byselection of mutually satisfactory across-the-flats dimensions, since this would permit the use ofthe same wrenches a
20、nd because other features would rarely affect interchangeability. After dueconsideration,suitableexistingacross-the-flatsdimensionswereselectedforthehexagonproductsaffected.In its meeting of October 13, 1950, Subcommittee 2 agreed to incorporate into the proposedstandard the conference recommendatio
21、ns on14in. hexagon head bolts,58in. hexagon head capscrews and automotive hexagon head bolts, and716in. light and regular hexagon and squarenuts. At a subsequent meeting of Subcommittee 2, further changes were adopted in order tocombine the light and regular series of nuts, and to combine the automo
22、tive hexagon head bolt,hexagon head cap screw, and regular hexagon head close tolerance bolt.In view of the progress made in the United States and the urgency of standardization formutual defense, the British Standards Institution sponsored a second conference in London inApril 1951 to complete the
23、unification of certain hexagon bolts and nuts.AtameetingonJune8,1951,Subcommittee2reaffirmeditsacceptanceoftheunifieddimensionsthat correspond with those in the March 1951 draft, but attempted to select better nomenclaturefor the unified products. A final draft incorporating the nomenclature “Finish
24、ed Hexagon BoltsandNuts”andcontainingnumerouseditorialchangeswassubmittedforletterballotinSeptember1951. Following approval by the B18 Committee and the sponsors, the proposal was presentedto the American Standards Association for approval and designation as an American Standard.This was granted on
25、March 24, 1952.It was recognized that the standard was in need of additional refinements, thereforeSubcommittee 2 began work immediately to eliminate these shortcomings. A proposed revisionremovinginconsistencieswithrespecttofillets,improvingthelengthtolerancesonheavyhexagonbolts, and incorporating
26、numerous other corrections and clarifications of an editorial natureresulted. The most noteworthy editorial change was a decision to combine the coverage forhexagon cap screws and square head set screws from the B18.2 standard with the coverage forslotted head cap screws and slotted headless set scr
27、ews from the B18.6 standard for publicationin a separate document. The requirements for the unified hexagon cap screws and finishedivhexagon bolts being identical in the overlapping sizes, the data would now be available in twopublications. Following approvals by the B18 Committee and sponsor organi
28、zations, the proposalwas submitted to the American Standards Association and declared an American Standard onFebruary 2, 1955.A revision of this Standard comprised of numerous editorial corrections and inclusion of anappendix for grade markings was duly approved and designated an American Standard o
29、nApril 18, 1960.At ameeting inFebruary 1960,Subcommittee 2approved arecommendation toreduce theheadheights for heavy, heavy semifinished, and heavy finished hexagon bolt, which was subsequentlyapproved by letter ballot of the B18 Committee on August 16, 1960. A proposed standard forheavy hexagon str
30、uctural bolts submitted and accepted by Subcommittee 2 at its October 17,1960 meeting was approved by letter ballot of the B18 Committee on May 9, 1961. To meet theurgentneedsofthesteelconstructionindustry,itwasconsiderednecessarytopublishthestandardfor the structural bolts immediately. Consequently
31、, Appendix IV to ASA B18.2-1960 containingcoverage for the revised heavy hexagon bolts and the new heavy hexagon structural bolts wasreleased in 1962.In October 1961, Subcommittee 2 appointed a subgroup to review all product standards forsquare and hexagon bolts, screws, and nuts, and to recommend s
32、implifications that would becompatible with technical, production, and distribution advances that had occurred over the priorseveral years. The subgroup presented its recommendations at a meeting of Subcommittee 2 inOctober 1962. It was agreed that the internally and externally threaded products sho
33、uld bepublished in separate documents as suggested, and draft proposals for each were completed.Theproposedrevisionforsquareandhexnutsincorporatedthefollowingsubgrouprecommen-dations: discontinuation of regular semifinished nuts; elimination of regular hexagon and heavyhexagon nuts in sizes14in. thr
34、ough 1 in.; elimination of finished hexagon nuts in sizes largerthan 112in.; elimination of the washer face semifinished style on finished series nuts in sizes58in. and smaller and heavy series nuts in sizes716in. and smaller; removal of machine screwnuts (these nuts are now contained in B18.6.3); a
35、nd adoption of an abbreviated product nomencla-ture.LetterballotofthisproposaltotheB18Committeeresultedinapproval.Followingacceptanceby the sponsor organizations the revision was submitted to the American Standards Associationand designated ASA B18.2.2 on September 8, 1965.Subcommittee 2 continued t
36、o further develop refinements initiated by the simplification sub-group and to study changes suggested by consumer interests. This work culminated in Subcom-mittee acceptance of a 1970 proposal incorporating, in addition to numerous editorial changes,revisions to the requirements on angularity of be
37、aring face and countersink diameters for thevarious hex nuts and heavy hex nuts, and inclusion of an appendix covering the gaging of slotsin slotted nuts.The proposed revision, after approval by letter ballot of the B18 Committee in March 1970,was subsequently approved by the sponsors and submitted
38、to the American National StandardsInstitutefor designationasanAmerican NationalStandard.This wasgrantedonJanuary 18,1972.A proposed revision of this Standard agreed upon by Subcommittee 2 incorporated a provisionto enable consumers to specify heavy hex nuts and heavy hex jam nuts with close bearing
39、faceangularity, when required; clarified intent with regard to width across flats on nuts producedfrom bar stock; deleted coverage for hex castle nuts from the appendices; and included numerouseditorial refinements. This proposal was formally approved by letter ballot of the subcommitteeand the B18
40、Committee. Following its acceptance by the sponsor organizations the revision wasreferred to the American National Standards Institute and granted approval as an AmericanNational Standard on February 27, 1987.In March 2009 the B18.2 Subcommittee undertook a revision of this Standard. The format hasb
41、een updated to meet the requirements of ASME B18.12.1. Regular pattern machine screw nutshave been moved from ASME B18.6.3, and the small pattern machine screw nuts have beenadded to this Standard. The hex flange nut that was previously referred to as IFI-145 has beenadded. Coupling nuts have been a
42、dded. Many of the sizes came from the IFI-128 and otherswere based on what has been used for many years by industry. This proposal was formallyapproved by letter ballot of the subcommittee and the B18 Committee. Following its acceptanceby the sponsor organizations, the revision was referred to the A
43、merican National StandardsInstitute and granted approval as an American National Standard on August 24, 2010.vASME 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.)STANDAR
44、DS COMMITTEE OFFICERSJ. Greenslade, ChairD. S. George, Vice ChairR. D. Strong, Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Autocraft IndustrialD. A. Clever, ConsultantP. Cockman, Ford Motor Co.C. A. Dugal de la Garza, TSP, Inc.D. S. George, ND IndustriesC. J. Gomez, The
45、American Society of Mechanical EngineersJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Contributing Member, Fastener Consulting Services, Inc.B. Hasiuk, Contributing Member, Defense Supply CenterPhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Leland-Powell Fasteners, Inc.J. Jennings, Cont
46、ributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.J. F. Koehl, Contributing Member, Spirol International Corp.SUBCOMMITTEE 16 NUTSW. R. Stevens, Chair, Ramco Specialties, Inc.V. Cartina, Vice Chair, ConsultantA. P. Cockman, Ford Motor Co.B. A. Dusina, Federal Screw WorksM
47、. A. Elmi, CaterpillarD. S. George, ND IndustriesJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Fastener Consulting Services, Inc.viW. H. Kopke, ConsultantW. J. Lutkus, Emhart TechnologiesD. McCrindle, Canadian Fasteners InstituteM. D. Prasad, Contributing Member, Global M however, they sh
48、ouldnot contain proprietary names or information.RequeststhatarenotinthisformatmayberewrittenintheappropriateformatbytheCommitteeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if add
49、itionalinformation 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 “endorse” 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.viiINTENTIONALLY LEFT BLANKviiiASME B18.2.2-2010Nuts for General Applications: Machi
