1、Pipe Threads, 60 deg,General PurposeAN AMERICAN NATIONAL STANDARDASME B1.20.2M-2006Intentionally left blank ASME B1.20.2M-2006Pipe Threads,60 deg,General PurposeAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Date of Issuance: June 15, 2007This Standard will be revised when the Soci
2、ety approves the issuance of a new edition. There willbe no addenda or written interpretations of the requirements of this Standard issued to this edition.Periodically, certain actions of the ASME B1 Committee may be published as Cases. Cases arepublished on the ASME Web site under the Committee Pag
3、es at http:/cstools.asme.org as they areissued.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 st
4、andard 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 agenc
5、ies, 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
6、 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, isent
7、irely 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 accordan
8、ce 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 Mech
9、anical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2007 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B1 Committee vi1 Scope 12 Reference and Symbols 13 Taper Pipe Thread Form . 14 Spe
10、cifications for General Purpose Taper Pipe Threads, NPT . 85 Specifications for Internal Parallel Threads in Pipe Couplings, NPSC 86 Gauges and Gauge Tolerances for Standard Pipe Thread, NPT 87 Gauging of Taper Pipe Thread, NPT. 118 Gauging of NPSC Parallel Pipe Threads. 11Figures1 Standard Taper Pi
11、pe Thread Notation 22 Basic Profile of Standard Taper Pipe Thread 33 Standard Taper Pipe Threads for Pressure-Tight Joints 54 NPT Standard Taper Pipe Thread Plug and Ring Gauges . 125 Suggested Form of Gauge Thread 126 Gauging External Taper Threads With Ring Gauge . 127 Gauging Internal Taper Threa
12、ds With Plug Gauge 128 Gauging of Chamfered Threads 18Tables1 Limits on Crest and Root Truncation of Standard External and InternalTaper Pipe Threads 42 Basic Thread Dimensions 63 Tolerances on Taper, Lead, and Angle of Pipe Threads, NPT 94 Dimensions, Internal Parallel Threads in Pipe Couplings, NP
13、SC . 95 Basic Dimensions of Plug and Ring Gauges for NPT Threads . 136 Tolerances for NPT Working Plug and Ring Gauges 147 Diameter Equivalent of Variation in Lead for Tools and Gauges . 168 Diameter Equivalent of Variation in Half Included Angle of Thread forTools and Gauges . 17Nonmandatory Append
14、icesA The Turns of Engagement Method of Verifying Product Threads 19B Tap Drill Sizes . 20iiiFOREWORDThis Standard is a metric conversion of the data for NPT inch series taper pipe threads andNPSC inch series straight internal pipe threads. The NPT and NPSC inch threads are includedin ANSI/ASME B1.2
15、0.1, Pipe Threads, General Purpose (Inch). Threads and gages delineatedherein are interchangeable with those in ANSI/ASME B1.20.1. Tabulated metric values have beenconverted from values in ANSI/ASME B1.20.1 and rounded in accordance with ASME B1.30,Screw Threads: Standard Practice for Calculating an
16、d Rounding Dimensions. Values are givenin millimeters.When compared to values calculated from formulas in this Standard, there may be a differencein the last decimal place but this will not affect interchangeability. The ASME B1 Subcommittee 20prepared this metric Standard in order to encourage glob
17、al use of the NPT Pipe Thread. For easeof use, both product threads and gauging are contained in this one Standard. NonmandatoryAppendices A and B are informative only and are not considered a part of this Standard.ASME B1.20.2M was approved by the American National Standards Institute on December21
18、, 2006.ivASME B1 COMMITTEEStandardization and Unification of Screw Threads(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSA. L. Barrows, ChairD. S. George, Vice ChairA. L. Guzman, SecretarySTANDARDS COMMITTEE PERSONNELA. L. Barrows,
19、 KennametalIPGF. G. Calderone, Corresponding Member, Quality SystemsImplementersR. Dodge, Pennoyer-Dodge Co.D. Everett, National Institute of Standards and TechnologyG. A. Flannery, Corresponding Member, Mercury Gage Co.H. N. Frost, Defense Supply Center PhiladelphiaJ. O. Gehret III, Vermont Thread
20、GageD. S. George, Ford Motor Co.J. R. Gervasi, Kerr Lakeside, Inc.J. Greenslade, Greenslade and Co.L. C. Borowski, Alternate, Greenslade and Co.A. L. Guzman, The American Society of Mechanical EngineersR. J. Hukari, SPS TechnologiesL. C. Johnson, The Johnson Gage Co.D. D. Katz, Precision FittingsR.
21、P. Knittel, Leitech-US Ltd.P. A. Larouche, Swanson Tool Manufacturing Co.SUBCOMMITTEE 20 PIPE THREADSD. D. Katz, Chair, Precision FittingsK. Bly, Hemco GagesM. Hop, Alternate, Hemco GagesF. G. Calderone, Corresponding Member, Quality SystemsImplementerJ. A. Casner, Corresponding Member, Casner Engin
22、eering ServicesM. Cox, Corresponding Member, Frank J. Cox Sales, Ltd.R. Dodge, Pennoyer-Dodge Co.G. A. Flannery, Corresponding Member, Mercury Gage Co.D. D. Gajdosik, Besly Products Corp.J. O. Gehret III, Vermont Thread GageJ. R. Gervasi, Kerr Lakeside, Inc.J. A. Gruber, Wheatland Tube Co.L. C. John
23、son, The Johnson Gage Co.vB. Larzelere, Corresponding Member, Deltronic Corp.L. L. Lord, Corresponding Member, Caterpillar, Inc.M. H. McWilliams, PMC LonestarD. Miskinis, KennametalIPGW. R. Newman, Corresponding Member, ConsultantD. R. Oas, Seaway Bolt and Specials Corp.M. W. Rose, Glastonbury South
24、ern GageW. A. Watts, Alternate, Glastonbury Southern GageE. Schwartz, ConsultantR. H. Searr, Member Emeritus, Mak Tool and GageB. F. Sheffler, Dresser-Rand Co.A. D. Shepherd, Jr., Emuge Corp.D. Skierski, Sterling Gage and Calibration LLCR. D. Strong, General Motors Corp.A. F. Thibodeau, Member Emeri
25、tus, Swanson Tool ManufacturingCo.R. E. Vincent, Jr., General Plug Manufacturing Co.C. J. Wilson, Industrial Fasteners InstituteR. P. Knittel, LeitechUS Ltd.P. A. Larouche, Swanson Tool Manufacturing Co.B. Larzelere, Corresponding Member, Deltronic Corp.M. H. McWilliams, PMC Lone StarD. R. Maisch, A
26、lternate, PMC Lone StarD. R. Oas, Seaway Bolt and Specials Corp.J. R. Popovic, Cleveland Specialty Inspection ServicesM. W. Rose, Glastonbury Southern GageR. H. Searr, Corresponding Member, ConsultantA. D. Shepherd, Jr., Emuge Corp.D. Skierski, Sterling Gage and Calibration LLCA. F. Thibodeau, Corre
27、sponding Member, Swanson ToolManufacturing Co.R. E. Vincent, Jr., General Plug Manufacturing Co.CORRESPONDENCE WITH THE B1 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with
28、 the Committeeby requesting interpretations, proposing revisions, and attending Committee meetings. Corre-spondence should be addressed to:Secretary, B1 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990Proposing Revisions. Revisions are made peri
29、odically to the Standard to incorporate changesthat appear necessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals should be
30、as specific as possible, citing the paragraph number(s), the proposed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.Proposing a Case. Cases may be issued for the purpose of providing alternative rules whenjustified, to permit early implemen
31、tation of an approved revision when the need is urgent, or toprovide rules not covered by existing provisions. Cases are effective immediately upon ASMEapproval and shall be posted on the ASME Committee Web page.Requests for Cases shall provide a Statement of Need and Background Information. The req
32、uestshould identify the standard, the paragraph, figure or table number(s), and be written as aQuestion and Reply in the same format as existing Cases. Requests for Cases should also indicatethe applicable edition(s) of the standard to which the proposed Case applies.Attending Committee Meetings. Th
33、e B1 Standards Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B1 Standards Committee.viASME B1.20.2M-2006PIPE THREADS, 60 deg, GENERAL PURPOSE1 SCOPEThis Standard specifies the designations, dimensions,and tol
34、erances and establishes a verification system for60 deg included angle pipe threads. It is applicable forgeneral purpose pipe and fitting connections. Wherepressure-tight joints are required, it is intended thattaper pipe threads conforming to this Standard be madeup wrench-tight with a sealant. To
35、prevent galling oncertain piping materials such as stainless steel, the seal-ant should contain a lubricant.Internal parallel (straight) pipe threads, series NPSC,are used with external taper pipe threads, series NPT.Internal taper pipe threads, series NPT, are used withexternal taper pipe threads,
36、series NPT.2 REFERENCE AND SYMBOLS2.1 Reference StandardThe following publication is referenced in this Stan-dard. The latest edition shall apply.ASME B1.20.1, Pipe Threads, General Purpose (Inch)Publisher: The American Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5900
37、; Order Department: 22 Law Drive,P.O. Box 2300, Fairfield, NJ 07007-23002.2 SymbolsThe following symbols are used (see Fig. 1):D p outside diameter of pipeE0p basic pitch diameter at small end of externalthread (or end of pipe)E1p basic pitch diameter at plane of hand-tightengagement length (L1), ex
38、ternal thread, largeend of internal threadE2p basic pitch diameter at plane of effective threadlength (L2), external threadE3p basic pitch diameter at plane of wrench-tightengagementE5p basic pitch diameter at L5K0p basic minor diameter at small end of externalthread (or end of pipe)L1p length of ha
39、nd-tight engagement betweeninternal and external threadsL2p length of effective thread, external threadL3p length of thread beyond L1allowingwrench-tight engagement, internal thread; alsowrench makeup1L4p overall length of thread, including vanishthread, external threadL5p length of complete threads
40、, external threadV p vanish thread(s), allowance for chamfer on tool-ing or other process of thread production3 TAPER PIPE THREAD FORM3.1 Thread ProfileThe form of thread profile specified in this Standardshall be known as the Standard Taper Pipe Thread Form.The relations as specified herein for for
41、m of thread andgeneral notation are shown in Fig. 2.3.2 Angle of ThreadThe angle between the sides of the thread is 60 degwhen measured in an axial plane. The line bisecting thisangle is perpendicular to the axis.3.3 Truncation and Thread HeightThe height, H, of the sharp V thread isH p 0,866025Pwhe
42、reP p pitch of threadThe basic maximum height of the truncated thread, h,(see Fig. 2) is based on factors entering into the manufac-ture of cutting tools and the making of tight joints.Maximum h p 0,800000PThe crest and root of pipe threads are truncated aminimum of 0,033000P. The maximum depth of t
43、runca-tion for the crest and root of these pipe threads will befound in Table 1. The crest and roots of external andinternal threads may be truncated either parallel to thepitch line or parallel to the axis.The illustration in Fig. 2, giving a sectional view ofthis standard thread form, represents t
44、he truncatedthread form by a straight line. However, when closelyexamined, the crests and roots of commercially manufac-tured pipe threads appear slightly rounded. When crestsand roots of threading tools or chasers lie within thelimits shown in Table 1, the pipe threads of productsproduced by such m
45、eans are acceptable on the basis ofin-process control.ASME B1.20.2M-2006Fig. 1 Standard Taper Pipe Thread NotationDPlane of wrench makeup Reference plane zeroPlane of hand-tight engagementPlane of complete thread length Plane of effective thread lengthPlane of vanish pointL5L3L1Wrench makeupLength e
46、xternal threadE3E0E5E1E2V2PK0L4L22ASME B1.20.2M-2006Fig. 2 Basic Profile of Standard Taper Pipe Thread90 deg90 deg90 deg90 deg90 deg60 degHhPH9252 H9252H9252H9251H9251H9251CrestRootAxisFrfrFcfcFcfcfrFrH9252CrestRootInternal ThreadExternal ThreadwhereFcp width of flat at crestFrp width of flat at roo
47、tfcp depth of truncation at crestfrp depth of truncation at rootH p 0,866025P p height of 60 deg sharp V threadh p 0,800000P p height of thread on productn p number of threads per 25,4 mmP p 25,4/n p pitch (measured parallel to axis)H9251 p 30 deg p thread flank angleH9252 p 1 47 p thread taper per
48、sideGENERAL NOTE: For a symmetrical parallel screw thread, H p 25,4 (cot H9251)/2n. For a symmetrical taper screw thread, the exact value forStandard taper pipe thread is H p 0,865743P. For a 3,175 mm pitch thread, which is the coarsest standard taper pipe thread pitch, thecorresponding values of H
49、are 2,74873 and 2,74963, the difference being 0,00090 mm. This difference being too small to be significant, thevalue of H p 0,866025P continues in use for threads of116taper on the diameter.3ASME B1.20.2M-2006Table1LimitsonCrestandRootTruncationofStandardExternalandInternalTaperPipeThreadsCrestRootCrestInternal Thread External ThreadMinimum truncationMaximum truncationMinimum truncationMinimum truncationMaximum truncationMaximum truncationh,max.HMinimum truncationMaximum truncationRootCrestHeightofHeightNumberSharpVTruncation,fEquivalentWidthofFlat,FofThread,ofThreads,Thread,h,
