ASME_B18.8.1-2014.pdf

AN AM E R IC AN NAT IO NAL STANDARDASME B18.8.1-2014Revision of ASME B18.8.1-1994(R2010)Clevis Pins and Cotter Pins(Inch Series)INTENTIONALLY LEFT BLANK ASME B18.8.1-2014Revision of ASME B18.8.1-1994(R2010)Clevis Pins andCotter Pins(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USADate of Issuance:January 14,2015This 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.Interpretations are published on the Committee Web page and under go.asme.org/InterpsDatabase.Periodically certain actions of the ASME B18 Committee may be published asCases.Cases are published on the ASME Web site under the B18 Committee Page at go.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 assume 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 2015 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B18 Committee.vii1Introduction.12General Data Clevis Pins.13General Data Cotter Pins.2Figure1Cotter Pin Length Gage.3Tables1Clevis Pin Dimensions.42Clevis Pin Lengths.53Length Tolerance.54Dimensions of Cotter Pins.65Preferred Sizes and Lengths of Extended Prong Type Cotter Pins.76Preferred Sizes and Lengths of Hammer Lock Type Cotter Pins.7iiiFOREWORDThe need for a Standard covering machine pins was recognized by industry as far back asMarch1926,when theSectionalCommitteeon theStandardizationofMachinePins wasorganizedunder the auspices of the American Standards Association(ASA)(later the United States ofAmericaStandardsInstitute,andasofOctober6,1969,theAmericanNationalStandardsInstitute,Inc.ANSI),with the Society of Automotive Engineers(SAE International)and the AmericanSociety of Mechanical Engineers(ASME)as joint sponsors.For the next year or two,an effort was made via correspondence to develop a basis on whicha standard for straight,taper,split,and dowel pins might be established.This correspondencedeveloped a distinct difference of opinion on the part of the manufacturers and users of tapermachine pins,which fact seemed to discourage the members of the committee from attemptingstandardization on any of the types of pins within its scope.The sponsor organizations madefrequent efforts to revive this project through letters and the distribution of technical literatureon this general subject,without avail.In December 1941,in its periodic review of standardsprojects for which the Society was sponsor,the ASME Standardization Committee decided thatthere was little hope for reviving this project and voted,subject to acceptance by the sponsors,to