1、AN AMERICAN NATIONAL STANDARD ASME B18.2.2-2015(Revision of ASME B18.2.2-2010)Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)ASME B18.2.2-2015(Revision of ASME B18.2.2-2010)Nuts for GeneralApplications: MachineScrew Nuts, Hex,Square, Hex Fl
2、ange,and Coupling Nuts(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: November 30, 2015This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of techni
3、cal aspectsof this Standard. Interpretations are published on the Committee Web page and undergo.asme.org/InterpsDatabase. Periodically certain actions of the ASME B18 Committee may bepublished as Cases. Cases are published on the ASME Web site under the B18 Committee Page atgo.asme.org/B18committee
4、 as they are issued.Errata to codes and standards may 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 B18 Committee
5、 Page can be found at go.asme.org/B18committee. There is an option availableto automatically 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“ sect
6、ion.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 balanced to assure that individu
7、als 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 the public-at-large.ASME does not
8、“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 anyone utilizing a standard agai
9、nst 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 own responsibility.Participatio
10、n 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 establishedASME procedures and
11、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 EngineersTwo Park Avenue, New York,
12、NY 10016-5990Copyright 2015 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . viiCorrespondence With the B18 Committee viii1 Introduction 12 References 13 General Data 1Tables1-1 Dimensions of Square and Hex Machine Screw Nuts 41-
13、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 of Hex Thick Slotted Nuts . 118 D
14、imensions 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 Dimensions of Hex Coupling Nuts .
15、17Mandatory AppendixI Slot Gages and Gaging for Slotted Nuts 19Nonmandatory AppendicesA Formulas for Nut Dimensions 21B Wrench Openings for Square and Hex Nuts 24C Procedure for Measuring Bearing Surface Runout . 26iiiFOREWORDAmerican National Standards Committee B18 for the standardization of bolts
16、, screws, nuts,rivets, 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 Engi
17、neers 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.Subcommittee2,afterappraisaloftherequirementsofindustry,developedaproposedsta
18、ndardseries of bolt head 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 Amer
19、ican Standard inJanuary 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 bol
20、tswas prepared and submitted 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 o
21、f discussing the proposals 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
22、ofthe same wrenches and 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 con
23、ference recommendations 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
24、to combine the automotive 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
25、1951 to complete the 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
26、 nomenclature “Finished Hexagon Boltsand Nuts” and containing numerous editorial changes was submitted for letter ballot inSeptember 1951. Following approval by the B18 Committee and the sponsors, the proposal waspresented to the American Standards Association for approval and designation as an Amer
27、icanStandard. This was granted on 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,improvingthelengthtolerancesonhea
28、vyhexagonbolts, and incorporating 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 s
29、crews and slotted headless set screws 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 th
30、e B18 Committee and sponsor organizations, 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
31、 designated an American Standard onApril 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 prop
32、osed standard forheavy hexagon structural bolts submitted and accepted by Subcommittee 2 at its October 17, 1960meeting was approved by letter ballot of the B18 Committee on May 9, 1961. To meet the urgentneeds of the steel construction industry, it was considered necessary to publish the standard f
33、orthe structural bolts immediately. Consequently, Appendix IV to ASA B18.2-1960 containing cover-age for the revised heavy hexagon bolts and the new heavy hexagon structural bolts was releasedin 1962.In October 1961, Subcommittee 2 appointed a subgroup to review all product standards forsquare and h
34、exagon bolts, screws, and nuts, and to recommend simplifications 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 t
35、he internally and externally threaded products should bepublished in separate documents as suggested, and draft proposals for each were completed.Theproposedrevisionforsquareandhexnutsincorporatedthefollowingsubgrouprecommen-dations: discontinuation of regular semifinished nuts; elimination of regul
36、ar hexagon and heavyhexagon nuts in sizes14in. through 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 screw
37、 nuts(these nuts are now contained in B18.6.3); and adoption of an abbreviated product nomenclature.Letter ballot of this proposal to the B18 Committee resulted in approval. Following acceptanceby the sponsor organizations the revision was submitted to the American Standards Associationand designate
38、d ASA B18.2.2 on September 8, 1965.Subcommittee 2 continued to further develop refinements initiated by the simplification sub-group and to study changes suggested by consumer interests. This work culminated inSubcommittee acceptance of a 1970 proposal incorporating, in addition to numerous editoria
39、lchanges, revisions to the requirements on angularity of bearing face and countersink diametersfor the various hex nuts and heavy hex nuts, and inclusion of an appendix covering the gagingof slots in slotted nuts.The proposed revision, after approval by letter ballot of the B18 Committee in March 19
40、70,was subsequently approved by the sponsors and submitted 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 specif
41、y heavy hex nuts and heavy hex jam nuts with close bearing 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 formall
42、y approved by letter ballot of the subcommitteeand the B18 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 Subcommi
43、ttee undertook a revision of this Standard. The format hasbeen 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 refe
44、rred to as IFI-145 has beenadded. Coupling nuts have been added. 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 th
45、e sponsor organizations, the revision was referred to the American National StandardsInstitute and granted approval as an American National Standard on August 24, 2010.vIn September 2014 the B18.2 Subcommittee agreed to revise this Standard. Updates to thestandard include correcting and expanding ta
46、bulated dimensions of small pattern hex machinescrew nuts, revising washer face diameter tolerancing to be consistent with cap screws, a revisedprocedure for thread acceptance gaging of jam nuts, and a nonmandatory appendix with aprocedure for measuring bearing surface runout. This revision was appr
47、oved as an AmericanNational Standard on August 12, 2015.viASME 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 OFFICERSJ. Greenslade, ChairD. S. Georg
48、e, Vice ChairR. D. Strong, Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELT. Anderson, Bay BoltL. Borowski, Greenslade however, they shouldnot contain proprietary names or information.RequeststhatarenotinthisformatmayberewrittenintheappropriateformatbytheCommitteeprior to being answere
49、d, 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 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 meetingsand/or telephone conferences that are open to the public. Persons wi
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