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AMERICANNATIONALSTANDARDDryseaI Pipe Threads(Inch)ANSI B1.20.3 - 1976( R E V I S I O N A N D R E D E S I G N A T I OOFN RRENT COMMITTEECOMMllTEE PERSONNELFORPERSONNELPLEASEE-MAILSEE ASMEMANUALAS-I 1PLEASECS@asme.orgSECRETARIATSOCIETY OF AUTOMOTIVE ENGINEERSTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSP U B L I S H E D BYTHEAMERICANS O C I E T YOFUnited Engineering CenterM E C H A N I C A L3 4 5 E a s t 4 7 t h StreetE N G I N E E R SNew York, N. Y. 1001 7

ANSI 81.20.3-197631 October 1980ACCEPTANCE NOTICEThe above non-Government document was adopted (with exception listed below) on31 1980andi s approvedfor use by the Federal agencies. The i n d i c a t e d i n d u s t r y g r o u phas furnished the Clearance required bye x f s t i n g r e g u l a t i o n s . C o p i e s o f t h e document are stocked by the 000 S i n g l e Stock Point, Naval Publicationsand Forms Center, Philadelphia, PA 19120, f o r i s s u e t o DoD a c t i v i t i e s o n l y . C o n t r a c t o r s and i n d u s t r ygroups must o b t a i n c o p i e s d i r e c t l y from:The American Society of Mechanical EngineersUnited Engineering Center, 345 East 47th Street,New York. NY 10017 o rThe American N a t i o n a l S t a n d a r d s I n s t i t u t e ,1430 Broadway, New York. NY 10018.T i t l e o f Document:Dryseal Pipe Threads (Inch)Date of Specific Issue Adopted:Releasing Industry Group:Exception:18 November 1976The American Society of Mechanical Engineers-The Federal agencies use of this Standardi s s u b j e c t t o a l l t h e r e q u i r e m e n tandslimitationsof FED-STD-H28/8Screw-Thread Standards f o r Federal Services Section 8, Dryseal Pipe Threads.Military Custodians:ArmyARNavyASAir Force - 11-Review A c t i v i t i e s :Army - AT, AV, ER, ME, M INavyOS, SH. YD-c i v i l Agency C o o r d i n a t i n g A c t i v i t i e s :Comnerce - NBSDOT - ACO, FHW. FIS. FRA, ROSGSA - FSS. PCDHUO - TCSI n t e r i o r - 8PAJustice - FPINASA - JFK, LRC, MSFUSOAAFS-Military Coordinating Activity:OLA- I S( P r o j e c t THCS-0034)NOTICE: When r e a f f i r m a t i o n . amendment, r e v i s i o n , o r c a n c e l l a t i o n o f t h i s s t a n d a r d i s i n i t i aproposed,llythe industry group responsible for this standard shall inform the military coordinating activity of theproposed change and request t h e i r p a r t i c i p a t i o n .AREA THOSNo part of this document may be reproduced in anyform, in an electronicretrieval system or otherwise, without the prior written permission of thepublisher.Copyright 0 1977 byTHE AMERICAN SOCIETYOF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U S A .

FOREWORDIn 1913 a Committee on the Standardization of Pipe Threads was organized for the purposere- ofediting and expanding the Briggs Standard. The American Gas Association and The American Society ofMechanical Engineers served as joint sponsors. After six years of work, this committee completed therevised standard for taper pipe thread which was publishedin the ASME “Transactions” of 1919, andwas approved as an American Standard by the then American Engineering Standards Committee (laterchanged to American Standards Association) in December,1919. It was the first standard to receive thisdesignation under theASA procedure, and was later republished in pamphlet form.In the years which followed, the need for a further revision of this American Standard becameevidentas well as the necessity of adding ittothe recent developmentsin pipe threading practice. Accordingly, theSectional Committee on the Standardization of Pipe Threads,B2, was organized in 1927 under the jointsponsorship of the A.G.A. and the ASME.During the following 15 years, several meetings were held leadingt o approval by the members of theSectional Committee, of the April 1941 draft. The revision was approved by the sponsors and ASA andpublished as an American Standardin October 1942.Shortly after publication of the1942 standard, the Committee undertook preparation of a completerevision. The text and tables were re-arranged and expanded to include Dryseal pipe threads, and an extensive appendix was added to provide additional data on the application of pipe threads and to recordinabbreviated form the several special methods which were establishedgagingfor some of the various applications of pipe threads.The resulting proposal was designated an American Standardon December 1 1 , 1945. The sectioncovering Dryseal Pipe Threadsin ASA B2.1-1945 was deleted and developedas a separate standarddesignated ASA B2.2-1960, Dryseal Pipe Threads. Another updating occurred with republicationas USAS B2.21968.In 1973, Standards Committee B2 was absorbed by American National Standards Institute StandardCommittee B1 and reorganized as subcommittee20. A complete rewrite of theB2.2-1968 document wasin separate documents from thegaging standards for Dryseal Pipeundertaken with the product thread datato include metric revisions,is as follows:threads. The system of renumbering,ANSI B1.20.3-1976 Inch Dryseal Pipe ThreadsANSI B1.20.4-1976 Metric Dryseal Pipe ThreadsANSI B1.20.5-197 Gaging for Inch Dryseal Pipe ThreadsANSI B1.20.6-197 Gaging for Metric Dryseal Pipe Threadsof the new gaging stanSince the product thread documents are being published before completiondards, the ,gaging datain the B2.2-1968 Standard should be used until superseded by publication of thenew B 1.20.5 and B 1.20.6gaging standards.ANSI B 1.20.3 and B 1.20.4 were approved by ANSI CommitteeB 1 for publication as official ANSIStandards and thereupon submitted to the Secretariat and the American National Standards Institute. Theywere approved and formally designatedas American National Standardson November 18, 1976.iii

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AMERICAN NATIONAL STANDARDSCOMMITTEE 61Standardization and Unification of Screw Threads(The followingis the roster of the Committee at the time of approval of this standard)Organized. . . . . . . . . . . . . . . . . . . . .Reorganized. . . . . . . . . . . . . . . . . . . . .June, 1921February, 1929SPONSORS: Society of Automotive EngineersThe American Society of Mechanical EngineersSCOPE:Nomenclature of screw threads; form of threads; diameter and pitches of screws forvarious uses; classification of thread fits, tolerances and allowances for threaded parts;and the gaging of threads. Screw threads for fire hose couplings are not included withinthe scope.T. C . Baumgartner, ChairmanJ. B. Levy, Vice-chairmanS . W. Taylor, SecretaryAEROSPACE INDUSTRIES ASSOCIATIONO F AMERICA, INC.Propulsion Technical CommitteeD. H. Secord, Pratt & Whitney Aircraft, E. Hartford, ConnecticutNational Aerospace Standards CommitteeE. L. Wall, McDonell Aircraft Company, St. Louis, MissouriAIRCRAFT LOCKNUT MANUFACTURERS ASSOCIATIONCharles Fineran, ESNA Division, American Amerace Corporation, Union, N.J.AIR INDUSTRIES CORPORATIONEdward Clark, Air Industries Corporation, Garden Grove, CaliforniaAlex Butovich, Alternate, Air Industries Corporation, Garden Grove, CaliforniaAMERICAN MEASURING TOOL MANUFACTURERS ASSOCIATIONDale Dodge, Pennoyer-Dodge Company, Glendale, CaliforniaAMERICAN SOCIETY OF MECHANICAL ENGINEERS, THEEdward McHugh, Professor, ClarksonCoUege of Technology, Potsdam,New YorkANTIFRICTION BEARING MANUFACTURERS ASSOCIATIONWilliam J. Derner, Bearing Division,FMC Corporation, Indianapolis, IndianaASSOCIATION O F AMERICAN RAILROADSEngineering DivisionC. C. Herrick, New York Central System,New York, New YorkBELOIT TOOL CORPORATIONPhillip V. Pasrore, Beloit Tool Corpwation, South Beloit, IllinoisJ. 0. Heinze, Alternate,Beloit Tool Corporation, South Beloit, IllinoisBENDIX CORPORATION, THEDale Story, The Bendix Corporation, South Beloit, IllinoisCLARK EQUIPMENT COMPANY0. N. Badgley. Clark Equipment Company, Battle Creek, MichiganV

COMPUTERS & BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATIONH . G. Atwater /observer), International Rusiness Machine Corporation, Endicott.New YorkCOMPRESSED GAS ASSOCIATION.INC.M. E. Steczynski, Steczynski & Associates, Chicago, IllinoisE. A . Olsen, Alternate, Compressed Gas Associate. lnc., New York,New YorkDEFENSE INDUSTRIAL SUPPLY CENTEREli Schwartz, Defense Industrial Supply Center. Philadelphia, PennsylvaniaFrancis S. Ciccarone, Alternate, Defense Industrial Supply Center, Philadelphla. PennsylvaniaFARM & INDUSTRIAL EQUIPMENT INSTITUTEC. W. Stockwell (observed,International Harvester Co., Hinsdale. IllinoisFORD MOTOR COMPANYS. E. Mallen, Ford Motor Company. Dearborn,MichiganJ. F. Nagy, Alternate, Ford Motor Company, Dearborn.MichiganGEOMETRIC TOOL CORPORATIONE. S. Zook, Geometric Tool, New Haven, ConnecticutGREENFIELD TAP& DIE DIVISION O F TRW INC.D. J. Ernanuelli, Greenfield Tape& Die, A United-Greenfield Divislonof TRW Inc., Greenfield, MassachusettsHANSON-WHITNEY COMPANY, THES. 1. Kanter, The Hanson-Whitney Company, Hartford, ConnecticutHI-SHEAR CORPORATIONM. M. Schuster, Hi-Shear Corporation, Torrance, CaliforniaINDUSTRIAL FASTENERS INSTITUTET. C. Baumgartner, Chairman, Standard Pressed Steel Company, Jenkintown, PennsylvaniaR. 6. Belford, Industrial Fasteners Institute. Cleveland, OhioR. M. Harris, Alternate, Bethlehem Steel Company, Lebanon, Pennsylvania0 . D. Wheeler, Armco Steel Corporation, Kansas City, MissouriR. W. Grower, Bethlehem Steel Company, Lebanon, PennsylvaniaK. E. McCullough, Alternate, Standard Pressed Steel Company, Jenkintown, PennsylvaniaJ. C. McMurray, Russell,Burdsall & Ward Bolt & Nut Company. Port Chester,New YorkJOHNSON GAGE COMPANY, THER. S. Chamerda, The JohnsonGage Co., Bloomfield, ConnecticutStanley Johnson, Alternate, The Johnson Gage Co., Bloomfield, ConnecticutMANUFACTURERS STANDARDIZATION SOCIETYOF THE VALVE& FITTINGS INDUSTRYJ. R. Welshman, Grinnel Corp., Providence, Rhode IslandMETAL CUTTING TOOL INSTITIJTETap and Die DivisionC. G. Erickson, Pratt &Whitney SmallTool Division, Colt Industries, Inc.,W. Hartford, ConnecticutNATIONAL AUTOMATIC SPRINKLER& FIRE CONTROL ASSOCIATIONFrank Hills, ColIigan Fyr-Protexion, Indianapolis, IndianaRay Malek, Paul J . Gruneau Company, Milwaukee, WisconsinNATIONAL ELECTRICAL MANUFACTURERS ASSOCIATIONF. V . Kupchak, Westinghouse Electric Corporation, Pittsburgh. PennsylvaniaJ. B. Levy, Vice-Chairman,General Electric Company, Schenectady, New YorkR. L . Mancini, Alternate,National Electrical Manufacturers Association, New York, New YorkNATIONAL MACHINE TOOL BUILDERS’ ASSOCIATIONThomas Lenhart, The Cleveland Twist Drill Company, Cleveland, OhioREED ROLLED THREAD DIE COMPANYJoseph f . Dickson, Reed Rolled Thread Die Company, Nolden, MassachusettsSOCIETY OF AUTOMOTIVE ENGINEERSC. H. Baker, Jr., Muncie, IndianaJ. E. Long, GM Corporation, GM Technical Center, Warren,MichiganL. R. Strang, Caterpillar Tractor Company, E. Peoria, Illinoisvi