2009_2019.pdf

AN AMERICAN NATIO NAL STANDARD ASME B89.1.7-2009Performance Standard for Steel Measuring TapesIntentionally left blank ASME B89.1.7-2009PerformanceStandard forSteel MeasuringTapesAN AMERICAN NATIONAL STANDARDDate of Issuance:September 18,2009This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Periodically,certain actions of the ASME B89 Committee may be published as Code Cases.Code Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.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.ASMEacceptsresponsibilityforonlythoseinterpretationsofthisdocumentissuedinaccordancewiththeestablishedASME 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 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B89 Committee.vi1Scope.12Definitions.13References.14General Requirements.25Steel Measuring Tapes.46Calibration and Maximum Permissible Errors.4Figure1Standard Practice for Zero Reference Marking.3Tables1Tension Requirements for Steel Measuring Tapes With Flat Rectangular CrossSection.42MPE for Representative Lengths of Curved Cross Section Tapes.63MPE for Representative Lengths of Flat Rectangular Cross Section Tapes.6Mandatory AppendixIReference Standard Traceability.7Nonmandatory AppendicesACalibration of a Tape by Comparison to a Master Tape.9BCalibration of a Tape Using a Laser Interferometer.12iiiFOREWORDASME Standards Committee B89 on Dimensional Metrology,under procedures approved bythe American National Standards Institute(ANSI),prepares standards that encompass the inspec-tionandthe meansofmeasuringcharacteristics ofsuchvariousgeometricparameters asdiameter,length,flatness,parallelism,concentricity,and squareness.Because steel measuring tapes arewidely used for the measurement and comparison of some of these features,the Chair of theB89Division1 LengthauthorizedtheformationofProjectTeamB89.1.7topreparethisStandard.The overall scope of Dimensional Metrology Measuring Tape Project Team B89.1.7 is to definethe requirements for steel measuring tapes for all units of measures in U.S.Customary units andSI units with respect to graduations,numbering,designations,and accuracy.This Standard provides guidance to users and manufacturers of steel measuring tapes withrespect to quality standards and preferred measuring units by specifying only the requirementsthat are essential for satisfactory performance.Presently,both SI(metric)and U.S.Customary(inch-based)graduations are in popular use.Nonmandatory Appendices A and B discuss tape calibration uncertainties and provide generalguidance and awareness regarding the determination and application of calibration uncertaintiesrelative to tape calibrations.Nonmandatory Appendix A treats the subject of calibration of atape by comparison to a master tape;Nonmandatory Appendix B discusses calibration of a tapeusing a laser interferometer.DraftsofthisStandardwereproposedanddiscussedduringprojectteammeetingsfromJanuary1996 through October 2008.This Standard was approved by the American National Standards Institute on June 15,2009.SuggestionsforimprovementofthisStandardarewelcome.Theyshouldbesen