ASME_B18.2.2-2022.pdf

AN AM E R IC AN NAT IO NAL STANDARDASME B18.2.2-2022(Revision of ASME B18.2.2-2015)Nuts for GeneralApplications:MachineScrew Nuts;and Hex,Square,Hex Flange,and Coupling Nuts(Inch Series)ASME B18.2.2-2022(Revision of ASME B18.2.2-2015)Nuts for GeneralApplications:MachineScrew Nuts;and Hex,Square,Hex Flange,and Coupling Nuts(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USAxDate of Issuance:March 11,2022This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Interpretations arepublished on the Committee web page and under go.asme.org/InterpsDatabase.Periodically certain actions of the ASME B18Committee may be published as Cases.Cases are published on the ASME website under the B18 Committee Page atgo.asme.org/B18committee as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon the date posted.TheB18CommitteePagecanbefoundatgo.asme.org/B18committee.Thereisanoptionavailabletoautomaticallyreceiveane-mail notification when errata are posted to a particular code or standard.This option can be found on the appropriateCommittee Page after selecting“Errata”in the“Publication Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.Thestandardscommittee that approved the code or standard was balanced to ensure that individuals from competent and concerned interests had anopportunitytoparticipate.Theproposedcodeorstandardwasmadeavailableforpublicreviewandcomment,whichprovidedanopportunityfor additional public input from industry,academia,regulatory agencies,and the public-at-large.ASMEdoesnot“approve,”“rate,”or“endorse”anyitem,construction,proprietarydevice,oractivity.ASMEdoesnottakeanypositionwithrespect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake toinsureanyone utilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,nordoesASMEassumeanysuchliability.Usersofa codeorstandardare expresslyadvisedthatdeterminationofthevalidity ofanysuchpatentrights,andthe riskofinfringementofsuch rights,is entirely their own responsibility.Participation by federal agency representatives or persons affiliated with industry is not to be interpreted as government or industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand 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,NY 10016-5990Copyright 2022 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedCONTENTSForeword.ivCommittee Roster.viCorrespondence With the B18 Committee.vii1Introduction.12References.13General Data.2Mandatory AppendixISlot Gages and Gaging for Slotted Nuts.22Nonmandatory AppendicesAFormulas for Nut Dimensions.24BWrench Openings for Square and Hex Nuts.27CProcedure for Measuring Bearing Surface Runout.30FiguresC-1Representation of Nut Bearing Surface Runout.30C-2Method for the Measuring of Nut Bearing Surface Runout to Nut Pitch Diameter.30Tables1.1.1-1Dimensions of Square and Hex Machine Screw Nuts.51.1.1-2Dimensions of Small Pattern Hex Machine Screw Nuts.61.1.1-3Dimensions of Square Nuts.71.1.1-4Dimensions of Hex Flat Nuts and Hex Flat Jam Nuts.81.1.1-5Dimensions of Hex Nuts and Hex Jam Nuts.91.1.1-6Dimensions of Hex Slotted Nuts.101.1.1-7Dimensions of Hex Thick Nuts.111.1.1-8Dimensions of Hex Thick Slotted Nuts.121.1.1-9Dimensions of Heavy Square Nuts.131.1.1-10Dimensions of Heavy Hex Flat Nuts and Heavy Hex Flat Jam Nuts.141.1.1-11Dimensions of Heavy Hex Nuts and Heavy Hex Jam Nuts.151.1.1-12Dimensions of Heavy Hex Slotted Nuts.171.1.1-13Dimensions of Hex Flange Nuts and Large Hex Flange Nuts.181.1.1-14Dimensions of Hex Coupling Nuts.191.1.1-15Dimensions of Hex Castle Nuts.21I-1Dimensions of Slot Gages and Gage Pins.23A-1Formulas for Nut Dimensions.25B-1Wrench Openings for Square and Hex Nuts.28iiiFOREWORDAmericanNationalStandardsCommitteeB18forthestandardizationofbolts,screws,nuts,rivets,andsimilarfastenerswas organized in March 1922 as Sectional Committee B18 under the aegis of the American Engineering StandardsCommittee(later the American Standards Association,then the United States of America Standards Institute,Inc.)with the Society of Automotive Engineersand the American Society ofMechanic