ASME_B18.16.6-2017.pdf

AN AM E R IC AN NAT IO NAL STANDARD ASME B18.16.6-2017(Revision of ASME B18.16.6-2014)Prevailing Torque Locknuts(Inch Series)ASME B18.16.6-2017(Revision of ASME B18.16.6-2014)PrevailingTorque Locknuts(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USADate of Issuance:June 19,2017This 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 thisStandard.InterpretationsarepublishedontheCommitteeWebpageandundergo.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 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 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.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.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 individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory 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 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 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.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 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2017 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B18 Committee.vi1Introduction.12Reference Standards.13Terminology.14Dimensions.15Nut Designs and Property Grades.26Corner Fill.27Chamfers and Bearing Circles.28Countersinks.29Threads.210Material,Mechanical,and Performance Properties.1111Test Methods.1112Grades and Manufacturing Marking.1513Quality Assurance.1514Workmanship.1515Designation.15Tables1Chemical Composition Requirements.22Hardness Requirements.23Style NE Nylon Insert Locknut Dimensions.34Style NTE Nylon Insert Locknut Dimensions.45Style NU Nylon Insert Locknut Dimensions.56Style NTU Nylon Insert Locknut Dimensions.67Style NM Nylon Insert Locknut Dimensions.78Style NTM Nylon Insert Locknut Dimensions.79Dimensions of Nylon Insert Hex Flange Nuts.810Dimensions of Prevailing Torque All-Metal Type Hex Nuts.911Dimensions of Prevailing Torque All-Metal Type Hex Flange Nuts.1012Proof Loads,Clamp Loads,and Prevailing Torques for Coarse Thread Locknuts.1213Proof Loads,Clamp Loads,and Prevailing Torques for Fine Thread Locknuts.1314Proof Loads,Clamp Loads,and Prevailing Torques for 8-UN Series ThreadLocknuts.13iiiFOREWORDASME B18.16.6-2008 was balloted and approved by the B18 Standards Committee andB18 Subcommittee 16 on April 29,2008.The proposal was submitted to the American NationalStandards Institute and designated as an American National Standard on August 25,2008.At the B18 meeting in the fall of 2011,Subcommittee 16 decided to expand this Standard toinclude all styles of locking nuts.B18.16.6 now contained dimensional and performance require-ments for nonmetallic insert and all-metal locking nuts in a variety of grades.This Standard wasintended to replace IFI-100/107,which the Industrial Fasteners Institute agreed to withdraw afte