Transcription
ASME B1.1-2003[Revision of ASME B1.1-1989 (R2001)]Unified InchScrew Threads(UN and UNR Thread Form)A N A M E R I C A N N AT I O N A L STA N DA R D
A NA M E R I C A NN A T I O N A LS T A N D A R DUNIFIED INCHSCREW THREADS(UN and UNR Thread Form)ASME B1.1-2003[Revision of ASME B1.1-1989 (R2001)]标准下载网(www.bzxzw.com)
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 published as necessary. This Standard will be revised when the Society approves theissuance of a new edition.There will be no 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 for public review and comment that provides an opportunity for additional public input 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 2004 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.
CONTENTSForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viviii1General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.2 Unified Screw Thread Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3 UN and UNR Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4 Interchangeability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5 Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.6 Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.7 Acceptability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.8 Reference Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.9 Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.10 Federal Government Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111111122222Screw Thread Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.2 Basic Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.3 Design Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.4 Formulas and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222223Screw Thread Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1 Thread Series Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.2 Order of Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.3 Coarse-Thread Series Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.4 Fine-Thread Series Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.5 Extra-Fine-Thread Series Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.6 Constant-Pitch Thread Series Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.7 Fine Threads for Thin-Wall Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222333374Screw Thread Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.1 Thread Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.2 Combinations of Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3636365Screw Thread Allowance and Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.1 Allowance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.2 Pitch Diameter Tolerance, All Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.3 Special Lengths of Engagement, LE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.4 Minor Diameter Tolerance and Allowance for External Threads . . . . . . . . . .5.5 Major Diameter Tolerance for Internal Threads . . . . . . . . . . . . . . . . . . . . . . . . . .5.6 Minor Diameter Tolerance and Length of Engagement for InternalThreads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.7 Disposition of Allowance and Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.8 Formulas for Allowance and Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.9 Lead and Flank Angle Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.10 Coated or Plated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.11 Circular Runout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .363636375454555555585858Screw Thread Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.1 Basic Method of Designating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58586iii标准下载网(www.bzxzw.com)
6.26.36.46.56.6Method of Designating Coated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Method of Designating Left-Hand Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Method of Designating UNS Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Designations for Other Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Method of Designating Threads Having Special Length ofEngagement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Method of Designating Threads Having Modified Crests. . . . . . . . . . . . . . . . .63637Dimensional Accommodation of Coating or Plating for 60-deg Threads . . . . . . . . . .7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.2 Material Lifts for Coated Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.3 Dimensional Effects of Coating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.4 External Thread With Allowance Available for Coating . . . . . . . . . . . . . . . . . .7.5 External Thread With No Allowance for Coating . . . . . . . . . . . . . . . . . . . . . . . .7.6 Internal Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.7 Electrodeposited Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.8 Other Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6464646464646667678Standard Series Threads (UN/UNR) and Limits of Size for Standard Seriesand UNS/UNRS Series Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.1 Standard Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.2 Limits of Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.3 Formulas for Limits of Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.4 Example of Calculations From Formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67676767689Lead and Angle Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9.1 Lead and Flank Angle Acceptance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .686810Formulas and Symbols for Thread Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.1 Thread Form Formulas and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .696911Tables of Basic Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.1 Table Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.2 Thread Series. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7070706.7Figures1Basic Profile for UN and UNR Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Disposition of Diametral Tolerances, Allowance, and Crest Clearance forUnified Inch Screw Thread Classes 1A, 2A, 1B, and 2B . . . . . . . . . . . . . . . . . . . . .3Disposition of Diametral Tolerances and Crest Clearances for Unified InchScrew Thread Classes 3A and 3B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Ratio of Pitch Diameter Change to Thickness of Coating on 60-degThreads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Effect of Electrodeposited Coatings on 60-deg External Threads . . . . . . . . . . . . . . .6Application of General Thread Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tables1Standard Series Threads (UN/UNR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Limits of Size for Standard Series Threads (UN/UNR) . . . . . . . . . . . . . . . . . . . . . . . .3Allowable Variations in Lead and Equivalent Change in FunctionalDiameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Increments in Pitch Diameter Tolerance — Class 2A . . . . . . . . . . . . . . . . . . . . . . . . . .5Thread Form Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Basic Dimensions for Coarse-Thread Series (UNC/UNRC) . . . . . . . . . . . . . . . . . . . .7Basic Dimensions for Fine-Thread Series (UNF/UNRF) . . . . . . . . . . . . . . . . . . . . . . .8Basic Dimensions for Extra-Fine-Thread Series (UNEF/UNREF) . . . . . . . . . . . . . . .9Basic Dimensions for 4-Thread Series (4-UN/4-UNR) . . . . . . . . . . . . . . . . . . . . . . . . .iv616262623456566706838565972737475
1011121314151617A17B18A18B19Basic Dimensions for 6-Thread Series (6-UN/6-UNR) . . . . . . . . . . . . . . . . . . . . . . . . .Basic Dimensions for 8-Thread Series (8-UN/8-UNR) . . . . . . . . . . . . . . . . . . . . . . . . .Basic Dimensions for 12-Thread Series (12-UN/12-UNR) . . . . . . . . . . . . . . . . . . . . . .Basic Dimensions for 16-Thread Series (16-UN/16-UNR) . . . . . . . . . . . . . . . . . . . . . .Basic Dimensions for 20-Thread Series (20-UN/20-UNR) . . . . . . . . . . . . . . . . . . . . . .Basic Dimensions for
ASME B1.3. This issue includes the following changes to ASME B1.1-1989: (a) The revision of some of the values in Table 2. These revisions are the result of the application of the consistent eight place decimal and rounding rules established in ASME B1.30-1992 that were mandated for use in all new and future revisions of ASME B1 documents. ASME B1.30 was
