1、AN AM E RIC A N NAT IO NAL STANDARDUnified Inch Screw Threads(UN and UNR Thread Form)ASME B1.1-2003Revision of ASME B1.1-1989(R2001)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distributi
2、on is permitted.Uncontrolled when printed.ANAMERICANNATIONALSTANDARDUNIFIEDINCHSCREWTHREADS(UNandUNRThreadForm)ASMEB1.1-2003RevisionofASMEB1.1-1989(R2001)Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further repr
3、oduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:September 30,2004The 2004 edition of this Standard is being issued with an automatic addenda subscription service.The use of addenda allows revisions made in response to public review comments or committeeactions to be
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10、y 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 2004 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyrighted
11、 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.viCommittee Roster.viii1General.11.1Scope.11.2Unified Screw Thread Standards.11.3UN
12、and UNR Screw Threads.11.4Interchangeability.11.5Designations.11.6Reference Documents.11.7Acceptability.21.8Reference Temperature.21.9Units of Measure.21.10 Federal Government Use.22Screw Thread Profile.22.1Scope.22.2Basic Profile.22.3Design Profiles.22.4Formulas and Symbols.23Screw Thread Series.23
13、.1Thread Series Definition.23.2Order of Selection.23.3Coarse-Thread Series Applications.33.4Fine-Thread Series Applications.33.5Extra-Fine-Thread Series Applications.33.6Constant-Pitch Thread Series Applications.33.7Fine Threads for Thin-Wall Tubing.74Screw Thread Classes.364.1Thread Classes.364.2Co
14、mbinations of Classes.365Screw Thread Allowance and Tolerance.365.1Allowance.365.2Pitch Diameter Tolerance,All Classes.365.3Special Lengths of Engagement,LE.375.4Minor Diameter Tolerance and Allowance for External Threads.545.5Major Diameter Tolerance for Internal Threads.545.6Minor Diameter Toleran
15、ce and Length of Engagement for InternalThreads.555.7Disposition of Allowance and Tolerance.555.8Formulas for Allowance and Tolerance.555.9Lead and Flank Angle Tolerances.585.10 Coated or Plated Threads.585.11 Circular Runout.586Screw Thread Designation.586.1Basic Method of Designating.58iiiCopyrigh
16、ted 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.6.2Method of Designating Coated Threads.616.3Method of Designating Left-Hand Threads.626.4Method of Designating UNS Threads.626.5Designations for Other Threads.626.6Method of Designating Threads Having Special Length ofEngagement.636.7Method of Designating Threads Having Modified Crests.637Dimensi
