-10M_Edtn_2004.pdf

Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ANAMERICANNATIONALSTANDARDUNIFIEDMINIATURESCREWTHREADSASMEB1.10M-2004(RevisionofASMEB1.10M-1997)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:March 5,2004This 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.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 the determination of the validity of any such patent rights,and the risk of the infringement of such rights,is entirely 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 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 EngineersThree Park Avenue,New York,NY 10016Copyright 2004 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B1 Committee.vii1General.12Screw Thread Profile.2Figures1Basic Profile for the UNM Screw Threads.42Design(Maximum Material)Thread Forms.53Disposition of Tolerances and Crest Clearances.8Tables1Thread Size Dimensions,Basic and Design.22Limits of Size and Tolerances.33Thread Form Formulas.64Thread Form Dimensions,Basic and Design.65Thread Size Formulas,Basic and Design.76Tolerance Formulas for Limits of Size.7Nonmandatory AppendicesAGages and Gaging for Unified Miniature Screw Threads.9BInch Conversion of Table 1.10CInch Conversion of Table 2.11DInch Conversion of Table 4.13iiiCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDThe standardization of threads for miniature fastening screws and similar purposes has beenunder study since 1927,when the National Screw Thread commission prepared a compilationof the practices of American manufacturers and various foreign standards.The latter includedthe Swiss standard NHS 56100,which first appeared in 1923.However,for want of sufficientinterest,no further action was taken in the United States until 1943,when the demands of modernwarfare awakened both theneed for domestic standardization and thedesirability of internationalstandardization,particularly among the inch-using countries.For the consideration of this dualproblem,together with other thread matters confined principally to the instrument industry,theAmerican Standards Association established,in 1944,ASA War Committee B1.7 on InstrumentScrew Threads.The first significant progress toward standardization and unification of miniature threadswas achieved at the American-British-Canadian Conference on the Unification of EngineeringStandards held in Ottawa in 1945,when the delegations of these three countries joined in recom-mending the adoption of the NHS thread series in the size range of 0.30 mm to 0.90 mm havinga 50 deg thread angle,and the development of a series closely following the NHS series for sizeslarger than 0.90 mm