2007_2017.pdf

Inverted Tooth(Silent)Chains and SprocketsAN AMERICAN NATIO NAL STANDARDASME B29.2M-2007Revision of ANSI B29.2M-1982(R2004)REAFFIRMED 2017Intentionally left blankASME B29.2M-2007Revision of ANSI B29.2M-1982(R2004)Inverted Tooth(Silent)Chainsand SprocketsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Date of Issuance:June 25,2007This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda or written interpretations of the requirements of this Standard issued to this edition.Periodically certain actions of the ASME B29 Committee may be published as Cases.Cases arepublished on the ASME Web site under the Committee Pages at http:/cstools.asme.org as they areissued.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 EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2007 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B29 Committee.vi1Silent Chains.12Sprockets.1Figures1Silent Chain.32Typical Links.33Link Form.34Chain Widths and Sprocket Profiles for38in.Pitch and Larger.55Chain Widths and Sprocket Profiles for316in.Pitch.106Sprocket Tooth Form for38in.Pitch and Larger.127Sprocket Tooth Form for316in.Pitch.138Sprocket Diameters for38in.Pitch and Larger.149Sprocket Diameters for316in.Pitch.14Tables1Chain Link Data,in.42Chain Link Data,mm.43Chain Widths and Sprocket Face Dimensionsfor38in.Pitch and Larger,in.64Chain Widths and Sprocket Face Dimensionsfor38in.Pitch and Larger,mm.85Chain Widths and Sprocket Face Dimensionsfor316in.Pitch,in.116Chain Widths and Sprocket Face Dimensionsfor316in.Pitch,mm.117Over Pin Diameter Tolerances for38in.Pitch and Larger,in.158Over Pin Diameter Tolerances for38in.Pitch and Larger,mm.159Over Pin Diameter Tolerances for316in.Pitch,in.1510Over Pin Diameter Tolerances for316in.Pitch,mm.1611Maximum Hub Diameter for Sprocket of Unity Pitch.1612Sprocket Dimensions for Unity Pitch,in.1713Sprocket Dimensions for316in.Pitch,in.2014Sprocket Dimensions for316in.Pitch,mm.22Nonmandatory AppendixASupplementary Information.25iiiFOREWORDPreparatory work during the late 1930s and early 1940s by the Silent Chain Division of theAssociation of Roller and Silent Chain Manufacturers(ARSCM,now the American Chain Associa-tion)resulted in agreement on standardization of silent chain primarily on the basis of standard-ized sprocket tooth design.Since individual chain manufacturers employed various chain jointdesigns,itwas agreed thatstandards on chaindetail would belimited to ensureinterchangeabilityof chains on sprockets of any number of teeth.At a meeting of representatives of all majorAmerican silent chain manufacturers in September 1944,under the auspices of the ARSCM,recommended“Engineering Standards for Industrial Silent Chain and Sprockets”were agreedupon.Formulasforsprocketdesignwereexpandedintotables,whichwereapprovedandadoptedby the ARSCM in April 1945.Supplementary information on sprocket tooth cutters was added,andallofthedatawereincorporatedinacomprehensivereport,IndustrialStandardsforIndustrialSilent Chains,Sprockets,and Cutters.This report,with further refinements by minor revisionsin 1949 and 1950,was then submitted to the Sectional Committee for review and approval as anAmeric