1、REAFFIRMED 2014FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgIntentionally left blank AN AMERICAN NATIONAL STANDARDUNIFIEDMINIATURESCREWTHREADSASME B1.10M-2004(Revision of ASME B1.10M-1997)Date of Issuance: March 5, 2004This Standard will be revised when the Society approves the issuance of
2、 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
3、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
4、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 asserte
5、d 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 val
6、idity 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 ac
7、cepts 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
8、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.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B1 Committee vii
9、1 General 12 Screw Thread Profile . 2Figures1 Basic Profile for the UNM Screw Threads 42 Design (Maximum Material) Thread Forms . 53 Disposition of Tolerances and Crest Clearances . 8Tables1 Thread Size Dimensions, Basic and Design . 22 Limits of Size and Tolerances 33 Thread Form Formulas 64 Thread
10、 Form Dimensions, Basic and Design 65 Thread Size Formulas, Basic and Design . 76 Tolerance Formulas for Limits of Size 7Nonmandatory AppendicesA Gages and Gaging for Unified Miniature Screw Threads 9B Inch Conversion of Table 1 . 10C Inch Conversion of Table 2 . 11D Inch Conversion of Table 4 . 13i
11、iiFOREWORDThe 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
12、 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 the need for domestic standardization and the desirability of internationalstandardization, particularly amo
13、ng 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
14、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 rang
15、e 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 with a 60 deg thread angle.In June 1946, the War Committee was converted to Subcommittee No. 4 on Instrument ScrewThreads of ASME Sectional Committee B1.
16、 Shortly thereafter it was learned that Swiss manufactur-ers were not adhering entirely to NHS 56100, but that the 60 deg thread angle made essentiallyin accordance with the Unified Thread Form was being widely used for the sizes below 1 mm.From this information and the results of subsequent experim
17、ental work by watch and instrumentmanufacturers both here and abroad, there developed a consensus favoring the 60 deg threadangle for all sizes.At a meeting in June 1952 of Technical Committee No. 1, Screw Threads, of the InternationalOrganization for Standardization, a diameter-pitch series coverin
18、g the range from 0.25 mm to1.40 mm was adopted for recommendation to all national standardizing bodies. The Committeealso agreed that further studies should be made regarding the use of the ISO Basic Profile (orUnified Thread Form) in this range.In the United States, where subsequent studies reveale
19、d no need, either current or anticipated,for sizes below 0.30 mm, it was established that the 60 deg angle for all sizes was feasible. It wasalso determined that the minor diameter of internal threads must be, and invariably is, keptabove the minimum value established by the Unified Thread Form to a
20、void excessive tappingdifficulties. From this conclusion and the calculation problems presented by the need for dimen-sioning this Standard in both metric and inch units, a simple plan evolved based on the coefficientof 0.52 in place of 0.54127 for basic thread height. These findings resulted in the
21、 formulation ofthe following recommendations by Subcommittee No. 4 for the American standard:(a) that the series consist of all sizes from 0.30 mm to 1.400 mm in the ISO recommendation(b) that the 60 deg thread angle be adopted over the entire range(c) that the design thread forms be based on the si
22、mplified value of 0.52P, instead of 0.54127P,for the basic thread heightThe American views were presented at both the American-British-Canadian Conference inApril 1955 and the plenary session of ISO in June 1955. The latter session developed Draft ISOrecommendation No. 84 covering a metric series fr
23、om 0.25 mm to 5.00 mm, with the ISO BasicThread Profile, having a 60 deg angle and a thread height of 0.54127P, applied over the entirerange.American sentiment was strongly in favor of the simplified coefficients for the thread sizes1.400 mm and below, and the previous issue of this Standard was for
24、mulated to incorporate theoriginal American recommendation on thread height. Despite this deviation, complete inter-changeability with product made to ISO recommendation No. 84 was regarded as a certainty inview of common practice on internal threads.ivTolerances given in this Standard were entirely
25、 of national origin, as recommendations on thisphase had not yet been formulated by other bodies.A preliminary draft of this Standard, approved by Subcommittee No. 4 on June 12, 1956, wasdistributed to industry for comment and criticism in October 1956. This draft was then revisedand submitted to th
26、e Sectional Committee B1 for letter ballot in April 1957. In response tocomments received with the letter ballot, the draft was further modified at a meeting of Subcom-mittee No. 4 on March 6, 1958. Following the acceptance of these modifications by the SectionalCommittee, the proposal was submitted
27、 to and approved by the sponsor organizations and ASA,and was formally designated as an American Standard on August 18, 1958.This Standard remained virtually unchanged from 1958 to 1995, while the use of miniaturethreads diminished considerably due to electronic components, replacing many of the mec
28、hanicaldevices used in watches and instrumentation. There still remains, however, an active use ofminiature screw threads in spacecrafts and aircrafts, as components are miniaturized for weightconsiderations. Attempts were made to revise the Standard between 1979 and 1983, but unresolvednegative vot
29、es defeated the proposed revisions. Efforts to revise the Standard were undertakenagain in 1989.The current Standard now has a thread height of 0.554H (0.48P), which is in agreement withFED-STD-H28/5 and ISO/R1501, and which allows for interchangeability with threads producedto the previous standard
30、 ASA B1.10-1958. The dimensions and symbology are in line with currentscrew thread practices. This revision of Unified Miniature Screw Threads lists all dimensions inmetric units. Inch conversions of these values have been placed in the Appendix Section of thisStandard.ASME B1.10M-1997 was approved
31、by the American National Standards Institute on July 11,1997.ASME B1.10M-1997 was revised again in 2003 to correct printing errors and update symbologyto be in line with current screw thread practice. Many of the values that are expressed with Phave been expanded to seven decimal places. This has be
32、en done to improve calculation accuracyin accordance with ASME B1.30. In addition thread values that were derived from a function ofH have been changed to a function of P.ASME B1.10M-2004 was approved by the American National Standards Institute onJanuary 14, 2004.vASME STANDARDS COMMITTEE B1Standar
33、dization and Unification of Screw Threads(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSA. L. Barrows, ChairD. S. George, Vice ChairR. L. Crane, SecretaryCOMMITTEE PERSONNELG. L. Allen, The L. S. Starrett Co.A. L. Barrows, Kennametal-IPGM. H. Bernier,
34、 Standard Nut and BoltF. G. Calderone, Quality Systems ImplementersR. L. Crane, The American Society of Mechanical EngineersL. N. Dixon, Jr., General ElectricR. Dodge, Pennoyer-Dodge Co.G. A. Glanner, Mercury Gage Co.D. Skierski, Alternate, Mercury Gage Co.H. N. Frost, Defense Supply Center Philadel
35、phiaJ. O. Gehret III, Vermont Thread Gage, LLCD. S. George, Ford Motor Co.J. R. Gervasi, Keri Lakeside, Inc.J. Greenslade, Greenslade and Co.J. Vance, Alternate, Greenslade and Co.R. J. Hukari, SPS TechnologiesL. C. Johnson, The Johnson Gage Co.D. D. Katz, Precision FittingsSUBCOMMITTEE 10 MINIATURE
36、 SCREW THREADSA. D. Shepherd, Jr., Chair, Emuge Corp.M. W. Rose, Southern Gage, Inc.M. H. McWilliams, PMC LonestarviR. P. Knittel, Leitech / AMTMAB. Larzelere, Deltronic Corp.L. L. Lord, ConsultantR. L. Tennis, Alternate, ConsultantM. H. McWilliams, PMC LonestarD. Miskinis, Kennametal-IPGW. R. Newma
37、n, Facil LLC, USAM. W. Rose, Southern Gage, Inc.W. A. Watts, Alternate, Southern Gage, Inc.E. Schwartz, ConsultantR. H. Searr, ConsultantB. F. Sheffler, Dresser-Rand Co.A. D. Shepherd, Jr., Emuge Corp.A. G. Strang, ConsultantR. D. Strong, General Motors Corp.A. F. Thibodeau, Swanson Tool Manufacturi
38、ng, Inc.R. E. Vincent, Jr. General Plug Manufacturing Co.C. J. Wilson, Industrial Fasteners InstituteF. W. Akstens, Alternate, Industrial Fasteners InstituteCORRESPONDENCE WITH THE B1 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned
39、 interests. As such, users of this Standard may interact with theCommittee by requesting interpretations, proposing revisions, and attending Committeemeetings. Correspondence should be addressed to:Secretary, B1 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York
40、, NY 10016-5990Proposing Revisions. Revisions are made periodically to the Standard to incorporatechanges that appear necessary or desirable, as demonstrated by the experience gained fromthe application of the Standard. Approved revisions will be published periodically.The Committee welcomes proposa
41、ls for revisions to this Standard. Such proposals shouldbe as specific as possible, citing the paragraph number(s), the proposed wording, and adetailed description of the reasons for the proposal, including any pertinent documentation.Attending Committee Meetings. The B1 Standards Committee regularl
42、y holds meetings,which are open to the public. Persons wishing to attend any meeting should contact theSecretary of the B1 Standards Committee.viiIntentionally left blank ASME B1.10M-2004UNIFIED MINIATURE SCREW THREADS1 GENERAL1.1 ScopeThis Standard specifies the thread form, series, toler-ance, and
43、 designation for the Unified Miniature ScrewThreads. The series covers a diameter range of 0.30 mmto 1.40 mm, extending the metric M-Profile and unifiedthread series that begin at 1.6 mm.1.2 Unified Miniature Screw Thread StandardsThe fourteen sizes published in this Standard wereendorsed by the Ame
44、rican-British-Canadian conferenceof April 1955 as the basis of the unified standard amonginch-using countries, and to correspond with the rangeof sizes in the ISO. The sizes are shown in Table 1. Ininterest of standardization and where design permits,selection of size should be confined to those ind
45、icatedin bold type in Table 1. For more restrictive conditions,those sizes indicated in regular type in Table 1 maybe used.1.3 DesignationUnified Miniature Thread sizes of this series shall bedesignated on engineering drawings, in specifications,and on tools and gages (space permitting) by their nom
46、i-nal diameter in hundredths of a millimeter followed bythe symbol “UNM” (e.g., 0.80 UNM).On internal threads, the full limits of minor diameter,as given in Table 2, shall normally be considered applica-ble. Where this is not permissible, the designation shallbe supplemented by the minor diameter li
47、mits.1.4 Reference Documents1The following is a list of publications referenced inthis Standard.ASME B1.7, Nomenclature, Definitions, and Letter Sym-bols for Screw ThreadsASME B1.30M, Screw ThreadsStandard Practice forCalculating and Rounding DimensionsPublisher: The American Society of Mechanical E
48、ngi-neers (ASME International), Three Park Avenue, NewYork, NY 10016-5990; Order Department: 22 LawDrive, Box 2300, Fairfield, NJ 07007-23001When the American National Standards referred to in this Stan-dard are superseded by a revision approved by the AmericanNational Standards Institute, the revis
49、ion shall apply.1ISO/R15012, ISO Miniature Screw ThreadsPublisher: International Organization for Standardiza-tion, 3 rue de Varembe, 1211 Geneve 20, Switzerland/Suisse1.5 AcceptabilityAdditional recommended methods for determiningthe acceptability of miniature screw threads will beincluded as further experience with this thread standardis reported. Until such time, agreements must be reachedbetween purchaser and vendor regarding the basis fordetermining acceptance, since practices are likely to dif-fer considerably, particularly for external threads. Wherea free choice is possible, th
