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ANSI-ASME B1.20.3-1976 英制干密封管螺纹


ANSI-B1.20.3 ADOPT1ON NOTICE

ANSI-B1.20.3, "Pipe Threads, Inch, Dryseal," was adopted on October 3, 1994 for use by the Department Defense (DoD). of Proposed changes by D

oD activities mustbe submitted to the DoD Adopting Activity: Commanding Officer, Naval Construction Battalion Center, Code 156, 1000 23rd Avenue, Port Hueneme, CA 93043-4301. DoD activities may obtain copies of this standard from the Standardization Document Order Desk, 700 Robbins Avenue, Building 40, Philadelphia, sector and other Government PA 19111-5094. The private from the American National agencies may purchase copies Standards Institute, 11 West 42nd Street,New York, NY
10036.

Custodians: Army - GL Navy - YD-1 Air Force - 11 DLA - IS

Adopting Activity Navy - YD-1

AREA THDS
DISTRIBUTION STATEMENT A. Approved f o r public release; distribution is unlimited.

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A M E R I C ANNA T I O N A L A N D A R D ST

DryseaI Pipe Threads
(Inch)
ANS.1 B1.20.3 - 1976
(REVISION AND REDESIGNATIONOs'; B2.?-1968)
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SECRETARIAT
SOCIETY OF-AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

P U B L I S H E D BY

T H EA M E R I C A N United Engineering Center

SOC?ETY

O ~ FM E C H A N I C A L

ENGINEERS
York, N. Y. 1001 7

345 East 47th Street New

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ASME B 3 * 2 0 * 3 76 W 2 5 7 5 5 3 2 0033B76 O

No part o this document may be reproduced in any foFm, in an electronic f retrieval system or otherwise, without the prior written permission of the publisher.

Copyright@ 1977 by THE AMERlCAN SOClETY OF MECHANICAL ENGINEERS Ail Rights Reserved Printed in U.S.A.

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FOREWORD
In 1913 a Committee on the Standardization of Pipe Threads was organized for the purpose of reediting and expanding the Briggs Standard. The American Gas Association and The American Society o Mechanical Engineers served as joint sponsors. After six years of work, this committee completed the revised standard for taper pipe thread which was published in the ASME “Transactions” of 1919, and was approved as an American Standard by the then American Engineering Standards Committee (later changed to American Standards Association) in December, 1919. It was the first standard to receive this designation under the ASA procedure, and was later republished in pamphlet form. In the years which followed, the need for a furtherrevision of thisAmerican Standard became evident as well as the necessity of adding to itthe recent developments in pipe threading practice. Accordingly, the Sectional Committee on the Standardization of Pipe Threads, B2, was organized in 1927 under the joint sponsorship of theA.G.A. and the ASME. During the following 15 years, several meetings were held leading to appromiby the members of the Sectional Committee, of the April 1941 draft. The revision was approved by the sponsors and ASA and published as an American Standard in October 1942. Shortly after publication of the 1942 standard, the Committee undertook preparationof a complete revision. 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 record in abbreviated form the several special methods which were established for gaging some of the various applications of pipe threads. The resulting proposal was designated an American Standard on December 11, 1945. The section covering Dryseal Pipe Threads in ASA B2.1-1945 was deleted and developed as a separate standard designated ASA B2.2-1960, Dryseal Pipe Threads. Another updating occurred with republication as USAS B2.21968. In 1973, Standards Committee B2 was absorbed by American National Standards Institute Standard Committee B1 and reorganized as subcommittee 20. A complete rewrite of the B2.2-1968 document was undertaken with the product thread datain separate documents from the gaging standards for Dryseal Pipe threads. The system of renumbering, to include metric revisions, is asfollows: ANSIBl.20.3-1976 Inch Dryseal Pipe Threads ANSI B1.20.4-1976 Metric Dryseal Pipe Threads ANSI B1.20.5-197 Gaging for InchDryseal Pipe Threads ANSI B1.20.6-197 Gaging for Metric Dryseal Pipe Threads Since the product thread documents are being published before completion of the new gaging standards, the gaging data in the B2.2-1968 Standard should be used until superseded by publication of the new B 1.20.5 and B 1.20.6 gaging standards. ANSI B1.20.3 and B1.20.4 were approved by ANSI Committee B1 for publication as official ANSI Standards and thereupon submittedto theSecretariat and theAmerican National Standards Institute. They were approved and formally designated as American National Standards on November 18,1976.

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AMERICAN NATIONAL STANDARDS COMMITTEE B1 Standardization and Unification of Screw Threads
(The following is the rosterof the Committeea t the timeof approval of this standard)

Organized. . . . . . . . . . . . . . . . . . . . . Reorganized. ....................

June, 1921 February, 1929

SPONSORS: Society of Automotive Engineers The American Society of Mechanical Engineers
SCOPE:
Nomenclature of screw threads; form of threads; diameter pitches and of screws for various uses; classification of thread fits, tolerancesandallowances for threadedparts; and the gaging of threads. Screw threads for fire hose couplings are not included within the scope.

T. C. Baumgartner, Chairman J. B. Levy, Vice-Chairman S. W. Taylor, Secretary

AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC.
Propulsion Technical Committee D. H. Secord, Pratt & Whitney Aircraft, E. Hartford, Connecticut National Aerospace Standards Committee E. L. Wall, hfcDonell Aircraft Company, St. Louis, Missouri

AIRCRAFT LOCKNUT MANUFACTURERS ASSOCIATION Charles Fineran, ESNA Division, American Amerace Corporation, Union, N.J. AIR INDUSTRIES CORPORATION Edward Clark, Air Industries Corporation, Garden Grove, California Alex Butovich, Alternate, Air Ind.ustries Corporation, Garden Grove, California AMERICAN MEASURING TOOL MANUFACTURERS ASSOCIATION Dale Dodge, Pennoyer-Dodge Company, Glendale, California AMERICAN SOCIETY O F MECHANICAL ENGINEERS, THE Edward McHugh, Professor, ClarksonCollegeof Technology, Potsdam, New York ANTIFRICTION BEARING MANUFACTURERS ASSOCIATION William J. Derner, Bearing Division, FMC Corporation, Indianapolis, Indiana ASSOCIATION O F AMERICAN RAILROADS
Engineering Division C. C. Herrick, New York Central System, New York, New York

BELOIT TOOL CORPORATION Phjllip V. Pastore, Beloit Tool Corporation, South Beloit, Illinois . J. O. Heinze, Alternate, Beloit Tool Corporation, SouthBeloit, Illinois BENDIX CORPORATION,THE Dale Story, The Bendix Corporation, South Beloit, Illinois CLARK EQUIPMENTCOMPANY D. N. Badgley, Clark Equipment Company, Battle Creek,Michigan
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ASME B 3 * 2 0 * 3 76 W 2575532 0033877 b W

COMPUTERS & BUSINESS EQUIPMENTMANUFACTURERS ASSOCIATION H. G. Atwater (observer), International Business Machine Corporation, Endicott, New York COMPRESSED GAS ASSOCIATION, INC. M. E. Steczynski, Steczynski & Associates, Chicago, Illinois E. A. Olsen, Alternate, Compressed Gas Associate, Inc., New York, New York DEFENSE INDUSTRIAL SUPPLY CENTER Eli Schwartz, Defense Industrial Supply Center, Philadelphia, Pennsylvania Francis S Ciccarone, Alternate, Defense Industrial Supply Center, . Philadelphia, Pennsylvania FARM & INDUSTRIAL EQUIPMENT INSTITUTE C. W. Stockwell (observer), International Harvester Co., Hinsdale, Illinois FORD MOTOR COMPANY S E. Mallen, Ford Motor Company, Dearborn, Michigan . J. F. Nagy, Alternate. Ford Motor Company, Dearborn, Michigan GEOMETRIC TOOL CORPORATION E. S. Zook, Geometric Tool, New Haven, Connecticut GREENFIELD TAP & DIE DIVISIONO F TRW INC. D. J. fmanuelli, Greenfield Tape & Die, A United-Greenfield Division ofTRW Inc., Greenfield, Massachusetts HANSON-WHITNEY COMPANY,THE S. l. Kanter, The HansonWhitney Company, Hartford, Connecticut HISHEAR CORPORATION M. M. Schuster, Hi-Shear Corporation, Torrance, California INDUSTRIAL FASTENERS INSTITUTE T. C Baumgartner, Chairman, Sfandard Pressed Steel Company, Jenkintown, . Pennsylvania R. B. Belford, Industrial Fasteners Institute, Cleveland, Ohio R. M. Harris, Alternate, Bethlehem Steel Company, Lebanon, Pennsylvania D. D. Wheeler, A r m a Steel Corporation, Kansas City, Missouri R. W. Groover, Bethlehem Steel Company, Lebanon, Pennsylvania K. f. McCullough, Alternate, Standard Pressed Steel Company, Jenkintown, Pennsylvania J. C McMurray, Russell,Burdsall &Ward Bolt & Nut Company, Port Chester, New York . JOHNSON GAGE COMPANY, THE R. S. Chamerda, The Johnson Gage Co., Bloomfield, Connecticut Stanley Johnson, Alternate, The Johnson Gage Co., Bloomfield, Connecticut MANUFACTURERS STANDARDIZATION SOCIETY F THE VALVE & FITTINGS INDUSTRY O J. R. Welshman, Grinnel Corp., Providence, Rhode Island METAL CUTTING TOOL INSTITUTE
Tap and Die Division C. G. Erickson, Pratt & Whitney Small Tool Division, Colt Industries, Inc., W. Hartford, Connecticut

NATIONAL AUTOMATIC SPRINKLER & FIRE CONTROL ASSOCIATION Frank Hilk, Colligan Fyr-Protexion, Indianapolis, Indiana Ray Malek, Paul J. Gruneau Company, Milwaukee, Wisconsin NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION F. V. Kupchak, Westinghouse Electric Corporation, Pittsburgh, Pennsylvania J. B. Levy, Vice-Chairman, General Electric Company, Schenectady, New York R. L. Mancini, Alternate, National Electrical Manufacturers Association, New York, New York NATIONAL MACHINE TOOL BUILDERS’ASSOCIATION Thomas Lenharr, The Cleveland Twist Drill Company, Cleveland, Ohio REED ROLLED THREAD DIECOMPANY Joseph F. Dickson, Reed Rolled Thread Die Company, Nolden, Massachusetts SOCIETY OF AUTOMOTIVE ENGINEERS C. H. Baker, Jr., Muncie, Indiana J. E. Long, GM Corporation, GM Technical Center, Warren, Michigan L. R. Strang, Caterpillar Tractor Company, E. Peoria, Illinois

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SOCIETY OF MANUFACTURING ENGINEERS M. Davidson, Thredco Company, Troy, Michigan J. S Urso, Sepulveda,Catifomia . Dale Story, The Bendix Corporation, South Beloit, Illinois SOCKET SCREW PRODUCTSBUREAU E. J. Heldmann, The Holo-Gome Screw Corporation, Hartford, Connecticut TELEPHONE GROUP,THE R. H. Van Horn, Bell Telephone Laboratories, Inc., Columbus, Ohio F.P. Balacek, Alternate, BellTelephone Laboratories, Inc., Columbus, Ohio L. L. Parrish, Alternate, Western Electric Company, Inc., Chicago, Illinois U.S. MACHINE, CAP, WOOD & TAPPING SCREW BUREAU R. M. Byrne, U.S. Screw Service Bureaus,New York, New York E. F. Tauscher, Altemate, Pheoll Manufacturing Company, Chicago, Illinois U.S. DEPARTMENT OF THEARMY Irwin Rosen, USA Mobility Equipment Company, FortBelvoir, Virginia M. L. Fruechtenicht, Alternate, Redstone Arsenal, Alabama John McAdams, Alternate, U.S. Army Materiel Command, Alexandria, Virginia
Watervliet Arsenal J. J. Fiscella, Watervliet, New York

U.S. DEPARTMENT OF COMMERCE
National Bureau of Standards A. G. Strang, National Bureau of Standards, Optical Physics Division, Washington, D.C.

U.S. DEPARTMENT OF THENAVY
Naval Ship Engineering Center (NSSC) J. Kelly, Naval Ship Systems Command, Washington,D.C.

U.S. DEPARTMENT OF THE AIR FORCE Edward Sosnowski, Aeronautical Systems Division, Wright-Patterson Force Base, Dayton, Ohio Air F. Hannon, Alternate, Aeronautical Systems Division, Wright-Patterson A r Force Base, Dayton, Ohio i R. B. Norwood, Robbins Air Force Base, Georgia VALLEY BOLTCOMPANY C. O. Franklin, Marion, Iowa VAN KEUREN COMPANY R. W. Lamport, The Van Keuren Company, Watertown, Massachusetts INDIVIDUAL MEMBERS

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S C. Adamek, (observer), Pheoll Manufacturing Company, Chicago, Illinois .
C.T. Appleton, Jefferson,Massachusetts W. E. Bour, Santa Monica, California W. S Brown, Roanoke, Virginia . J.F.Cramer, DesMoines, Washington R. B. Donahue, Xerox Corporation, Rochester, New York E. W. Drescher, Bulova Watch Company, Inc., Flushing, New York 1. H. Fullmer (observer), Silver Springs, Maryland W. E. Hay, The Pipe Machinery Company, Wickliffe, Ohio A. R. Machel/, Jr,, Xerox Corporation, Rochester, New York A. E. Masterson, Watervliet, New York P. V. Miller (observer). Santa Maria, California H. G Muenchinger, Continental Screw Company, New Bedford, Massachusetts . Frank Tisch, Desert Hot Springs, California R.P. Trowbridge, GM Technical Center, Warren, Michigan J. E. Watson, Philadelphia,Pennsylvania
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PERSONNEL

OF SUBCOMMITTEE

NO. 20 ON PIPE THREADS

D. N. Badg/ey, Chairman, Clark Equipment Company, BattleCreek, Michigan W. E. Bow, Gardena, California R. J. Browning, Southern Gage Company, Erin, Tennessee J. A. Casner, Youngstown Steel Company, Youngstown, Ohio W. O., Clinedinst, Consulting Engineer, Pittsburgh, Pennsylvania

M. Davidson, Southfield, Michigan H. W. Nlison, General Motors Technical Center, Warren, Michigan L. S. Feldheim, Secretary, The Weatherhead Company, Cleveland, Ohio J. O. Heinze, Regal-Beloit Corporation, South Beloit, Illinois J. S. Hinske, Parker-Hannifii Corporation, Tube Fitting Division, Cleveland, Ohio D. F. Hubbard, Long Island Lighting Company, Hicksville, New York S. 1. Kanter, The Hanson-Whitney Company, Hartford, Connecticut W. A. Keaton, Vice Chairman, General Motors Technical Center, Warren, Michigan W. C. Matlock, Stockham Valves & Fittings, Birmingham, Alabama R. S. Piotrowski, Mack Trucks, Inc., Allentown, Pennsylvania P. V. Pastore, Regal-Beloit Corporation, South Beloit, Illinois W. M. Roll, Deere & Company, Moline, Illiiois M. Rose, Southern Gage Company, Erin, Tennessee R. J. Ross, Wheeling-Pittsburgh Steel Corporation, Benwood, West Virginia C. J. Schim, Ford Motor Company, Dearborn, Michigan J. Shields, Jackes-Evans Manufacturing Company, Jackson, Mississippi J. Turfon, The Bendix Corporation, South Beloit, Illinois A. G. Strang, National Bureau of Standards,Washington, D.C.

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CONTENTS

Section 1 Product Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Thread Types ............................................... 1.3 Thread Designations and Notation ................................. 1.3.1 NPTF Thread Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3.2 Designation of Plafed Threads .................................... 1.4 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.1 Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.1.1 NPTF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.1.2 PTFSAE SHORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.1.3 NPSF .................................................... 1.4.1.4 NPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.2 CLASS ................................................... 1.4.2.1 NPTF CLASS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.2.2 NPTFCLASS 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 Assembly Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Thread Form and Tolerance ..................................... 1.7 Basic Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7.1 NPTF Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7.2 PTF-SAE SHORT. External Threads ................................ 1.7.3 PTF-SAE SHORT. Internal Threads ................................ 1.7.4 NE'SF Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7.5 NE'S1 Threads ............................................... Appendix A A.l A.2 Appendix B Appendix C
C .1 C.2 C.3 C.4 CS C.6
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Page 1 1 2 3 3 3 3 3 3 3 4 4 4

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4 4 4 7 7 8 9 10 10
11 11 11 14 15 15 15 15 16 16 16 16

LetterSymbols and Formulas .................................... Symbols Designating the Dimensions of Pipe Threads. .................... Formulas for Diameter and Length of Thread .......................... Suggested Tap Drill Sizes forInternal Dryseal Pipe Threads . . . . . . . . . . . . . . . . . Special Short. Special Extra Short. Fine. and Special Diameter-Pifch Combination Dryseal PipeThreads .............................. Dryseal Special Short Taper Pipe Thread. PTF-SPL SHORT ................. Dryseal Special Extra Short Taper Pipe Thread. PTFSPL EXTRA SHORT . . . . . . Limitations of Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dryseal Fine TaperThread Series. F-PTF ............................. Drysed Special Diameter-Pitch Combination Series.SPL-PTF . . . . . . . . . . . . . . . Formulas for Diameter and Length of Thread .......................... Designations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(2.7
Table 1 2 3 4

Recommended Limitations of Assembly Among the Various Types of Dryseal Threads . . . Reference Dimensions for Assembled Engagement of Dryseal Pipe Threads . . . . . . . . . . . Basic Dimensions for NPTF Threads ...................................... Basic Dimensions for PTF-SAE SHORT. ExternalThreads ......................
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5
5

7 8

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Table 5 Basic Dimensions for PTF-SAE SHORT. InternalThreads ....................... 6 Dimensional Datafor NPSF Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Dimensional Datafor NPSI Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 9 10 10 12 14 18 19 2 6 13 7

Al B1 C1 C2
Figure

Pipe Thread Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Suggested Tap Drill Sizes for Internal Dryseal Pipe Threads ...................... Basic Dimensions of Dryseal Fine Taper Pipe Thread. F-PTF ..................... Basic Dimensions of Dryseal Special Taper Pipe Thread. SPL-PTF (For Thin Wall Nominal Size OD Tubing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extreme Mating Conditions for Dryseal Pipe Threads ......................... Thread Form and Limits on Root and Crest Tuncation of Product Threads . . . . . . . . . . Application of Pipe Thread Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Comparison of Special Dryseal Threads with Standard Length Dryseal Threads . . . . . . . .

1 2 A1 C1

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ANSI 81.20.3-1976

AMERICAN NATIONAL STANDARD

INCH DRYSEAL PIPE THREADS

SECTION I PRODUCT THREADS

1.1 Introduction

Dryseal pipe threads are based on theUSA (American) pipe thread, however, they differ from theUSA (American) pipe thread in that they are designed to seal pressuretight joints without the necessity of using sealing compounds. To accomplish this some modification of thread form and greater accuracy in manufacture is required. The roots of both the external and internal threads are truncated slightly more than the crests, Le. roots have wider flats than crests, so that metal-to-metal contact occurs at the crests and roots coincident with or prior to flank contact, see Figure 1. Thus as the threads are assembled by wrenching, the roots of the threads crush the sharper crests of the mating threads. This sealing action at both the major and minor diameters tendsto prevent spiral leakage and makesthe jointspressuretight without thenecessity of using sealing compounds, provided that the mating threads are in accordance with standard specifications and tolerances and are not damaged by galling in assembly. The control of crest and root truncation is simplified by the use of properly designed threading tools. Also, it is desirablethat both external and internal threads have full thread height for the L I length. However, where not functionally objectionable, the useof a compatible lubricant or sealant may beused to minimizethe possibility of galling. This is desirable in assemblingDryseal pipe threads in refrigeration and other systems to effect a pressuretight seal.' 1.I .I In order to obtain a pressure tight seal using Dryseal pipe threads without a sealer, it is necessary to hold crest and root truncation ofboth internal and externalthreadswithinthe limits specified. Unless this is done by use of threading tools with the crest and root truncation controlled so as to assure repro-

'The refrigeration industry has generally accepted the use of
a sealant to obtain an absolute pressuretight joint,when assembling taper pipe threads.

duction on the product threads, it is necessary to use a system ofmeasuring or a systemof gaging and measuring to determine conformance. 1.1.2Even withouttruncation gages, the standard practice of using two separate thread gages for Dryseal pipe threads, eachwitha difference in truncation, length of engagement and point of engagement, provides a more detailed check of angle, lead and taper deviations than is required for non-dryseal taper pipe threads. 1.I .3 One method of checking crest truncation is by using 6 step plain gages. It should be recognizedthat this method may give misleading results in that the crest truncation of the product threads is always less (flat narrower) than that indicated by the position of the gages, the degree of inconsistency depending on the angle, lead and taper deviations present in the product thread. 1.1.4 Another method employs both crest and root truncation check gages. The root check gage is made with a thread form having an included angle of 50 degrees and with a smallergagecrest flat than the root flat to be checked. The major diameter of this gageis controlled in relation to 6 gaging steps in a similar manier to the plain 6 step crest check gage. Like the crest check gage, the results may be somewhat misleading except that in the case of the root check gage, the root truncationof the product thread is always more (flat wider) than is indicated by the position of the gages. 1.1.5 Unless lead, angle and taper of product threads are veiy well controlled, use of 6 step crest and root check gages will result in product threads with narrower crest flats and wider root flats than envisioned by the dryseal tolerances. Use of such a gaging system could result in rejection of threads which would actually conform tothe dryseal tolerances specified. The only completelyreliable referee method fordetermining whether crest and root truncation has been 1

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ASME 81.20.3 76 W 2595512 O O I I B B 5

I W

AMERICAN NATIONAL STANDARD INCH DRYSEAL PIPE THREADS

ANSI 81.20.3-1976

held within tolerance is direct measurement of the external thread flats and measurement of these flats on a cast or section of the internal thread,
1 . I .6 This standard covers two classes of NPTF Dryseal pipe threads; Class 1 and Class 2. Theclasses differ only in inspection requirements, with Class 1 threads exactly those standardized in ANSIB2.2-1968 (inspection of root and crest truncation not specified). Class 2 threads are identical to Class 1 threads except that inspection ofroot and crest truncation isrequired. For Class 2 threads, direct measurement of crest and root truncation is the referee method. These classes do not apply to other than NPTF Dryseal pipe threads. 1 . I .7 All dimensions in this standard including all tables are in inches u?ess otherwise noted.

1.2 Thread Types External Dryseal pipe threads are tapered only. Internal Dryseal pipe threads may be either straight or tapered, as specified. Also, thread lengths may be either “standard” or “short,” depending on the requirements ofthe application. Theshortexternal thread is obtained by shortening the standard thread by one pitch at the small end. A short internal taper thread is obtained by shortening the standard thread by one pitch at the large end. Accordingly, there are four standard types of Dryseal pipe threads, as follows: Type 1 - Dryseal USA (American) Standard Taper Pipe Thread, NPTF Type 2 - Dryseal SAE Short Taper Pipe Thread, PTESAE SHORT Type 3 - Dryseal USA (American) Standard Fuel Internal StraightPipe Thread, NPSF Type 4 - Dryseal USA (American) Standard Intermediate Internal Straight Pipe Thread, NPSI

NO CLEARANCE (BASIC)

MAXIMUM INTERFERENCE

//MAXIMUM\\

NO CLEARANCE (BASIC)

MAXIMUM INTERFERENCE

The minimum material condition as shown at the left is established by having the mating crests androots of equal truncation so as t o assure metal t o metal contact at these points coincident with flank contact. This condition is established at the sharpest root and the flattestcrest and gives no clearance. Tolerances at the crests and roots are established in the direction of interference only, therefore the maximum material condition shown at the right is established by having the extreme combination of sharpest crests and flattest roots, which provide the maximum interference. NOTE: When threaded joints are made up wrenchtight, it is intended that the flanks and the crests and roots shall be in contact.
FIG 1 EXTREME MATING CONDITIONS FOR DRYSEAL PIPE THREADS

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AMERICAN NATIONAL STANDARD INCH DRYSEALPIPE THREADS

ANSI 81.20.3-1976

1.3 Thread Designations and Notation

The above types of Dryseal pipe threads are designatedby specifying in sequencethenominal size designations, thread series symbol, and class, as follows: y8-27 NPTF-1 7 -27 NPTF-2 8 78-27PTF-SAE SHORT . ‘/8 -27 NPSF 78 -27 NPSI Each of the letters in the symbols has a definite significance as follows: N = National (American) Standard P = Pipe T = Taper S = Straight F = Fuel and Oil I = Intermediate 1.3.1 NPTF Thread Class. Two classes of NPTF threads have been established: Class 1 andClass 2. Class 1 signifies that specific inspection of root and crest truncation is no required, while class 2 signifies that such isrequired. Since class notation is introduced in this standard there will undoubtedly be a long period of time before users completely adopt the new classification. In cases where class is not denoted, the thread shall be considered Class l. 1.3.2 Designation of Plated Threads. Theproduct specifications of this standard do notinclude an allowance for plating. If plating is desired, it may be necessary to modify the threads since the same final gaging requirementsmust be satisfied for platedand unplated parts. This may be emphasized by adding the words AFTER PLATING tothe designation. For manufacturing purposes, notes for plated taper pipe threads mayspecify the gage limits (turns engagement) before plating followed bythe words “BEFORE PLATING.” These should be followed by the standard gage limits (turns engagement) after plating and the words “AFTER PLATING,” Examplesoptional of designations foran external threadhaving 0.0002inch plating thickness are: 38 -18 NPTF-1, or / ”/8 -18 NPTF-1 AFTER PLATING, or ”/8 -18 NPTF- 1, L 1 RING GAGE LIMITS 2% to4% tums~engagement before plating 2% to 4% turns engagement after plating 3/8-18 NPTF-1, L2 RING GAGE LIMITS 2% to 3%turns beyond actual L 1 gage turns engagement before and afterplating.
3

Example of optional designations for internal thread with 0.0002 inchplating thickness is: 3/8-18 NPTF-1, or 38 -18 NPTF-1 AFTER PLATING, Or / 3/8-18 NPTF-1, L1 PLUG GAGE LIMITS 3 to 4% turns engagement beforeplating 2%to 4% turns engagement after plating 3/8-18 NPTF-1, L3 PLUG GAGE LIMITS 2% to 3% turns beyond actualL l gage turns engagement before andafter plating.
1.4 Applications
1.4.1 Type

1.4.1.1 NPTF, This type applies to both external and internal threads and is suitable for pipe joints in practically every type of service. Of all Dryseal pipe threads, NPTF external and. internal threads mated are generally conceded to be superior for strength and seal since they have the longest length of thread and theoretically, interference (sealing) occurs at every engaged thread root and crest. Use of tapered internal threads, such as NPTF or PTF-SAE SHORT in hard or brittle materials having thin sections will minimize the possibility of fracture. 1.4.1.2 PTF-SAE Short. External threads of this type conform in all respects with NPTF threads, except that the threadlength hasbeen shortenedby eliminating one thread from the small (entering) end. Thesethreads are designed for applications where clearance is not sufficient for the full thread length of NPTF threads or for economy of material, where the full thread length is not necessary. HF-SAE SHORT external threads are intended for assembly with NPSI threads, but may also be assembled with NPTF internal threads. They are not designed for and at extreme tolerance limits may not assemble with PTFSAE SHORTinternal or NPSF threads. Internal threads of type conform in all respects this with NPTF threads, except hat the thread length has been shortened by eliminating one thread from the large (entry) end. These threads are designed for thin materials where thickness is not sufficient for the full thread length ofNPTF threads or foreconomy in tappingwhere the full thread length is not necessary. PTF-SAE SHORT internal threads are primarily intendedfor assembly with NPTF external threads. They are not designed for andat the extreme tolerance limits may not assemble with PTFSAE SHORT external threads. Pressure-tight joints without the use of lubricant or sealer can best be assured where mating components are both threaded with NPTF threads. This

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~~

ASME B 3 * 2 0 . 3 7b

m

2 5 7 5 5 3 2 0033B87 5 W

AMERICAN NATIONALSTANDARD INCH DRYSEALPIPE THREADS

ANSI 81.20.3-1976

should be considered before specifying PTF-SAE SHORT external or internal threads. 1.4.1.3 NPSF. Threads ofthistype are straight (cylindrical) instead oftapered and internal only. They. are more economical to produce than tapered internal threads, but when assembled do not offer as strong a guarantee of sealing since root and crest interference will not occur for all threads. NPSF threads are generally used with soft or ductile materials which will tend to adjust at assembly to the taper of external threads, but may be used in hard or brittle materials where the section is thick. Theyare primarily intended for assembly with NPTF external threads. (For other applications see Appendix C.) 1.4.1.4 NPSI. Threads ofthistype are straight (cylindrical) instead of tapered, internalonly, and are slightly larger in diameter than NPSF threads 'but have the same tolerance and thread length. They are more economical to produce than tapered threads and may beused in hard or brittle materials where the section is thick or where there is little expansion at assembly with external taper threads. As with NPSF threads, NPSI threads when assembled do not offer as strong a guarantee of sealing as do tapered internal threads. NPSI threads are primarily intended for assembly with PTF-SAE SHORT external threads, but can be used with NPTF external threads. 1.4.2 Class 1 4 2 I NPTF Class 1. Threads made to this class ... are designed to interfere (seal) at root and crest when mated, but inspectionof crest and root truncation for acceptance is not required. Consequently, Class 1 threads are intended for applications where close control of tooling is required for conformance of truncation or where sealing is accomplished by means of a sealant applied to the threads. . 1 4 2 2 NPTF Class 2 Threads made to this class ... are theoretically identical to those made to Class 1, however: inspection of root and crest truncation is required. Consequently, where a sealant is not used, there is more assurance of a pressure-tight seal for Class 2 thieads than forClass 1 threads.
1.5 Assembly Limitations

tapered and can be made as both external and internal threads. Types 3 and 4 are straight threads and are made only as internal threads. When selecting the combination of external and internal threads to be mated, Table 1 should be used as a guideline. Approximate values for length of engagement for various assemblies are given in Table 2. 1.5.2Anotherimportantfactor to consider inthe design and manufacture of Dryseal pipe threads is the effect of out-of-roundness which is possible.between the wrench-tight mated parts in final assembly. This will vary depending on the method for producing the thread in conjunction with the elasticity and/or ductility of the mating parts and the resultant conformance at final assembly.
1.6 Thread Form and Tolerance

1.5.1 As described in par. 1.2, there are four types of standard Dryseal pipe threads. Types 1 and 2 are

Dryseal pipe threads are triangular with truncated roots and crests, The angle between the flanks of the thread is 60 degrees when measured on an axial plane and the line bisecting this angleis perpendicular to the axis of both thetaper and straight threads making each half angle equal to 30 degrees, Thread form and limits on crest and root truncation are given in Figure 2. Although the crests and roots of the Dryseal threads are theoretically flat, they may be rounded providing their contour is within the limits shown in Figure 2. They are truncated parallel to the pitch line on both product and gage threads. There is no specified tolerance on product pitch diameter, exceptforinternal straight pipe threads. Basic size of the product thread is defrned using the basic dimensions covered in paragraph 1.7 and deviations from basic size not defined by a specific tolerance are defined entirely by the gages used for acceptance. In particular, the maximum deviation of functional size from basic is plus and minus 1 turn for NPTF, plus O minus 1%turns for PTF-SAE SHORT, plus O minus 1%turns for NPSF and plus 1 minus % turns for NPSI of the L I gage. In addition, the L2 or L3 gage must correlate within plus and minus % turns of the actual L I gage position on each specific taper threaded part. Diametral taperoftaperedthreads is 0.0625 f 0.0050 inch per inch of length.

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AMERICAN NATIONAL STANDARD INCH DRYSEAL PIPE THREADS

ANSI 61.20.3-1976

Table 1 Recommended Limitation of Assembly among the Various Types of Dryseal Threads'
External Dryseal thread: Table Type Description

For Ascembly with Internal

Dryseal thread: Description

1

4

NPTF (tapered), ext thd

NPTF (tapered), int thd ETF-SAE SHORT (tapered), int thd NPSF (straight), int thd NPSI (sfmight), int thd

PTF-SAE SHORT (tapered) ext thd

NPSI (straight), int thd NPTF (tapered), int thd

An assembly with straighf infernal pipe threads and taper external pipe threads is frequently more advantageous than an all taper thread assembly, particularly in automotive and other allied industries where economy and rapid production are major considerations. Dryseal threads are not used in assembliesin which both components have straight pipe threads. Pressuretight joints without the use of a sealant can best be assured where both components are threaded with NPTF (full length threads), since theoretically interference (sealing) occurs a t all threads, but there are two less threads engaged than for NPTF assemblies. When straight internal threads are used, there is interference only at one thread depending on ductilify of materials. for PTFSAE SHORT external threads are primarily intended assembly with type 4-NPSI internaL threads but can also be used with type 1-NPTF internal threads. They are not designed for, and at extreme tolerance limits may not assemble with, type 2-PTFSAE SHORT internal threads or type 3-NPSF internal threads. 4PTFSAE SHORTinternalthreadsareprimarilyintended for assembly withtype 1-NPTFexternal threads. They are not designed for, and at extreme tolerance limits may not assemble with, type 2-PTFSAE SHORT external threads. There is no external straight Dryseal thread. 6NPSI internal threads are primarily intended for assembly with type 2-PTFSAE SHORT extefnal threads but will also assemble with full length type 1 NPTF externalthreads.

Table 2 Reference Dimensions for Assembled Engagement of Dryseal Pipe Threads
Approximate Length of Thread Engagement NPTF ExternalThread Assembled Into Size

NPSI Internal Thread, L,
+

NPTF Internal Thread,

NPSF Internal Thread,

PTF-SAE SHORT Internal Thread,

f

Approximate Length of Thread Engagement PTF-SAE SHORT ExternalThread Assembled Into NPSI Intemal Thread,

NEF Internal Thread,

- NPSF Internal Thread,

PTF-SAE
SHORT Internal Thread,

3P

L , + 2.5~ 3 4

L , + 1.5~

L,

+

2P

L , + 1.5~ 7

L,

+

1P

L , + 0.5~

1
"

2

5

6

8
.
"

9
..

.-

- 27 % - 18
'18

'11.5 - 27

- 18

0.27 0.27 0.39 0.41 053 0.55 0.66 0.68 0.68 0.70 1 - 06 : 1.14

0.25 0.25 0.37 0.38 0.50 0.52 0.62 0.64 0.64 0.65 0.99 1.08

0.23 0.23 0.34 0.35 0.46 0.48 0.57 0.59 0.59 0.61 0.93 1.02

0.22 0.22 0.31 0.32 0.43 0.45 0.53 0.55 0.55 0.57 0.87 0.95

0.23 0.23 0.34 0.35 0.46 0.48 0.57 0.59 0.59 0.61 0.93 1.02

0.22 0.22 0.31 0.32 0.43 0.45 0.53 0.55 0.55 0.57 0.87 0.95

0.20 0.20 0.28 0.29 0.39 0.41 0.49 0.51 0.51 0.52 0.81 0.89

0.18 0.18 0.26 0.27 0.36 0.37 0.44 0.46 0.46 0.48 0.74 0.83

% % 1 1% 1% 2 2% 3

- 14 - 14 - 11% - 11% - 11% - 11% - .S

- 8

5

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Equivalent Minimum At Crest Formula Inch At Root Formula Inch Width of Flat Maximum At Crest At Root Formula Inch Formula Inch 0.047~ 0.036~ 0.040~ 0.042~ 0.0069 FIG 2 THREAD FORi.4 AND 0.094p 0.078~ 0.060~ 0.060~ 0.055~ LIMITS 0.0035 0.0043 0.0043 0.0052 0.0069 0.0017 0.0026 0.0026 0.0035 0.0052 0.094p 0.078~ .O.O6Op 0.060~ 0.055~ 0.0035 0.0043 0.0052 0.0043 0.140~ 0.109p 0.085~ 0.09Op 0.076~ ON ROOT AND 0.0052 0.0061 0.0061 0.0078 0.0095 0.054~ 0.054~ 0.042~ 0.046~ 0.048~ CRESTTRUNCATION 0.0020 0.0030 0.0030 0.0040 0.0060 0.108~ 0.09Op 0.070~ 0.069p 0.064~ 0.0040 0.0050 0.0050 0.0060 0.0080 0.108~ 0.09Op 0.070~ 0.069p 0.064~ OF PRODUCTTHREADS 0.0040 0.0050 0.0050 0.0060 0.0080 0.162~ 0.126~ 0.098p 0.103~ 0.088p 0.0060 0.0070 0.0070 0.0090 0.0110

Threads

Per Inch

Truncation Height of Sharp V Minimum Maximum Thread At Crest At Root At Crest At Root Inch Formula Inch Formula Inch Formula Inch (HI F ormuki

21 18 14 11% 8

0.03208 0.04811 0.06180 0.07531 0.10825

1.7 Basic Dimensions 1.7.1
HAND ’ -I- ONE TURN FULLTHREAD =I AT MAX INT THD PO ENGAGEMENT &I) t L3

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NPTF Threads

Table 3

Basic Dimensions

for NPTF Threads

Pitch

RZ End of
Ext. Thread (E, ) Inch 0.2711E 0.36351 0.47739 0.61201 0.75842 0.96768 1.2136: 1.5571’: 1.79609 2.26902 2.7195: 3.3406:
tabulated full thread

Size

(P)

PD at Large End of Int Thread (E, ) Hand Engagement (L,)

- Inch 0.28118 0.37360 0.49163 0.62701 0.77843 0.98887 1.23863 1.58338 1.82234 2.29627 2.7621t 3.3885( 1.84130 2.31630 2.79062 3.41562 1.7798 2.2527 2.6961 3.3172 0.4200 0.4360 0.6820 0.7660 0.79179 1.00179 1.25630 1.60130 0.7451 0.9543 1.1973 1.5408 0.3200 0.3390 0.4000 0.4200 4.48 4.75 4.60 4.83 4.83 5.01 5.46 6.13 0.5337 0.5457 0.6828 0.7068 0.7235 0.7565 1.1375 1.2000 0.1600 0.1615 0.2278 0.2400 4.32 4.36 4.10 4.32 0.2611 0.2639 0.4018 0.4078 7.05 7,12. 7.23 7.34 7.47 7.64 7.85 8.13 8.32 8.70 9.10 9.60

Inch
0.1139 0.1112 0.1607 0.1547 0.2163 0.2043 0.2547 0.2620 0.2765 0.2747 0.3781 0.3781 3.075 3.072 2.892 2.791 3.028 2.860 2.929 3,013 3.180 3.159 3.025 3.025
length. of the pitch

t

%6 “I8 =/ ‘1s

-

27 27 18 18

0.03704 0.03704 0.05556 0.05556

0.3750 0.3750 0.5625 0.5625 0.7500 0.7500 0.9375 0.9688 1.0000 1.0312 1.5156 1.5781

6.1011 0.1024 0.1740 0.1678 0.2137 0.2067 0.2828 0.2868 0.3035 0.3205 0.4555 0.4340

2.73 2.76 3.13 3.02 2.99 2.89 3.25 3.30 3.49 3.69 3.64 3.47

0.2711 0.2726 0.3945 0.4067 0.5343 0.5533 0.6609 0.6809 0.6809 0.6969 1.0570 1.1410

7.32 7.36 7.10 7.32 7.48 7.75 7.60 7.83 7.83 8.01 8.46 9.13

0.315 0.407 0.546 0.681 0.850 1.060 1.327 1.6’72 1.912 2.387 2.893 3.518

0.3125 0.4050 0.5400 0.6750 0.8400 1.0500 1.3150 1.6600 1.9000 2.3750 2.8750 3.5000

% -14 Y4 -14 1 -11% 1% - 11%

0.07143 0.07143 0.08696 0.08696

1% 2 2% 3

-11% - 11% - 8 - 8

0.08696 0.08696 0.12500 0.12500

thread

a External b Internal

thread

tabulated

full thread

lengths include chamfers not exceeding one pitch (thread) lengths do not include countersink beyond the intersection

line and the chamfer

cone (gaging

reference

point).

ASME B 1 2 0 * 3 7 b W 2 5 7 5 5 1 2 0011871 7

AMERICAN NATIONAL STANDARD INCH DRYSEALPIPE THREADS

ANSI 81.20.3-1976

1.7.2 PTF-SAE SHORT, External Threads

HAND ENGAGEMENT(L~ SHORT)

+ ONE TURN FULL THREAD

t4p

='

AT MAXINT THD P D

AT MIN EXTTHD PD

L2 SHORT

t I ONE TURN

~

CHAMFER DIE AND

FULL THREAD

1 SHOULDERCLEARANCE

Table 4 Basic Dimensions for PTF-SAE Short, External Threads
PD at End of Ext Thread E, Short,

Size

Pitch (P)

7
Inch 0.1600 0.1615 0.2278 0.2400 0.3200 0.3390 0.4000 0.4200 0.4200 0.4360 0.6820 0.7660 4.32 4.36 4.10 4.32

Hand Engagement (L, Short) Inch rhd - Thd 0.1230 0.1244 0.1722 0.1844

Length of Full Thread (L2Short)a Inch

Thd 6.05 6.12 6.23 6.34

t

Vanish Thds V Plus Full Minimun Sxternal Thread for Thd To1 Shouldel Plus Draw Length (L2Short Shoulder (L2 Shor + 2 % ~ ) L, Short) Clearance W+lP+%P) Inch Inch Thd Inch Thd "

I

Inch 0.2711 0.2726 0.3945 0.4067 0.5343 0.5533 0.6609 0.6809 0.6809 0.6969 1.0570 1.1410

- 27 - 27 % - 18 % - 18
'116

'18

0.03704 0.03704 0.05556 0.05556

0.27349 0.36582 0.48086 0.61548

3.32 0.2241 3.36 0.2268 3.10 0.3462 3.32 0.3522 3.48 0.4623 3.75 0.4743 3.60 0.5958 3.83 0.6198 3.83 4.01 4.46 5.13 0.6365 0.6695 1.0125 1.0750

0.0926 0.0926 0.1389 0.1389

2.50 0.3167 2.50 0.3194 2.50 0.4851 2.50 0.4911 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.50
L

0.1011 0.1024 0.1740 0.1678 0.2137 0.2067 0.2828 0.2868 0.3035 0.3205 0.4555 0.4340

2.73 2.76 3.13 3.02 2.99 2.89 3.25 3.30 3.49 3.69 3.64 3.47

0.07143 0.76289 0.07143 0.97214 34 - 1 4 1 -11% 0.08696 1.21906 1% - 11% 0.08696 1.56256

% - 14

4.48 0.2486 4.75 0.2676 4.60 0.3150 4.83 0.3330 4.83 0.3330 5.01 0.3490 5.46 0.5570 6.13 0.6410 -

6.47 0.1786 6.64 0.1786 6.85 0.2174 7.13 0.2174 7.32 7.70 8.10 8.60 0.2174 0.2174 0.3125 0.3125

0.6409 0.6528 0.8132 0.8372 0.8539 0.8869 1.3250 1.3875

1% 2 2% 3
a b

- 11% -11% - 8 - 8

0.08696 0.08696 0.12500 0.12500

1.80152 2.27445 2.72734 3.34844

-

External thread tabulated full thread lengths include chamfers not exceeding one pitch (thread) length. .~ Internal thread tabulated full thread lengths do not include countersink beyond the intersection of the pitch line and the (gaging reference point).

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AMERICAN NATIONAL STANDARD INCH DRYSEAL PIPE THREADS

ANSI 81.20.3-1976

1.7.3 PTF-SAE SHORT, Internal Threads

ATMAX INT THD P D

E3

E O

(

(SEE TABLE 3)

SHORT )

El

Table 5 Basic Dimensions for PTFSAE Short, Internal Threads
Pitch (P) Inch - 27 - 27 h - 18 ' 318 - 18
'h6

Size

PD at End of I n t Thread Short)

(, E

Inch 0.27887 0.37129 0.48815 0.62354 0.77397 0.98441 1.23320 1.57795 1.81691 2.29084 2.75435 -x38069

T

Hand Engagement (L, Short) Inch 0.1600 0.1615 0.2278 0.2400 0.3200 0.3390 0.4000 0.4200 0.4200 0.4360 0.6820 0.7660 Thd 4.32 4.36 4.10 4.32 4.48 4.75 4.60 4.83 4.83 5.01 5.46 6.13 Inch 0.1230 0.1244 0.1722 0.1844 0.2486 0.2676 0.3130 0.3330 0.3330 0.3490 0.5570 0.6410 Thd 3.32 3.36 3.10 3.32 3.48 3.75 3.60 3.83 3.83 4.01 4.46 5.13

T

Length of Internal F l Thread ul (L, Short + L,)a Inch 0.2341 0.2356 0.3389 0.3511 0.4629 0.4819 0.5739 0.5939 0.5939 0.6099 0.9320 1.0160 Thd 6.32 6.36 6.10 6.32 6.48 6.75 6.60 6.83 6.83 7.01 7.46 8.13

Hole Depth For S A E Short Tap Inch 0.4564 0.4578 0.6722 0.6844 0.8915 0.9105 1.0956 1.1156 1.1156 1.1316 1.6820 1.7660

'18

0.03704 0.03704 0.05556 0.05556 0.07143 0.07143 0.08696 0.08696 0.08696 0.08696 0.12500 0.12500

% -14 % -14 1 -11% 1% - 11%

1% -11% 2 -il% 2% - 8 3 - 8

a Internal thread tabulated full thyead lengths do not include countersink beyond the intersection of the pitch line and the chamfer cone (gaging reference point).

9

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AMERICAN NATIONAL STANDARD INCH DRYSEAL PIPE THREADS

ANSI B1.20.3-1976

1.7.4 NPSF Threads.

Table 6 Dimensional Data for NPSF Threads
Size - 27 - 27
-

Pitch Diametera Mind
I

Minor Diameterb ThdMin 0.2482 0.3406 0.4422 0.5776

Desired Minimum FuUThread Lengthc Inch

Maxe 0.2803

%6
'18

0.2768 0.3692 0.6205 0.7700
1

0.31
0.3727 0.4904 0.31 0.47 0.4852 0.50 0.66 0.66 0.78 0.7767
I

?h
S / '

18
18 0.6257

8.44 8.44 8.44 9.00

0.7133

% - 14 % -14 1 - 11%

1.2284

I

0.9872 1.2365

0.9805
I

0.9238 1.1600

I

I

I

9.19 9.19 8.98

a The pitch diameter of the tapped hole as indicated by the taper plug gage is slightly larger than the values given due to the gage having to enter approximately '18 turn to engage f i s t full thread. b As the Dryseal AmericanStandardpipethread form is maintained, the majorandminordiameters of the internal thread vary with the pitch diameter. c Internal thread tabulated full thread lengths do not include countersink beyond the intersection of the pitch line and the chamfer cone (gaging reference point). d Minimum pitch diameter is the maximum pitch diameter reduced by 1%turns. e Maximum pitch diameter is the same as the E, fitch diameter at large end of internal thread (Table 3) minus (small) thread taper.

1.7.5 NPSlThreads

Table 7 Dimensional Data for NPSl Threads
Size 27 - 27 ?4 - 18 '/8 - 18
%6

Pitch Diametera Mind 0.2791 0.4886 0.6240 0.4938 0.6292

Minor Diameterb

Desired Minimum Full Thread LengthC Inch Thd. 8.44 8.44 8.44 9.00 0.31

Maxe

Min
0.2505 0.3429 0.4457 0.5811 0.7180 0.2826 0.3750

-

'/S

0.3715 -0.31 0.47 0.50 0.7745

% - 14 % -14 1 -11%

0.7812

0.9850

0.9917

9.19 0.66 9.19 0.66 0.9283 8.98 0.78 1.1655 '1.2420

1.2338

Footnotes a, b, c and d as shown under Tableapply also to Table 7. 6 e Maximum pitch diameter is the same as the E, pitch diameter at large end of internal thread (Table 3) plus (large) thread taper.

'/8

10

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APPENDIX A LETTER SYMBOLS AND FORMULAS

A.l

Symbols Designating Thread Elements

the Dimensions of Pipe

Basic pitch diameter of thread a t large end of NPTF internal thread.

Standardlettersymbols to designate the dimensions of pipe threads are given in Table A l . The application of pipe thread symbols illustrated in Figure is Al.
A.?
Formulas for Diameter and Length of Thread

El =Eo

+ (0.0625L1 Basic)

Basic pitch diameter of thread a t large end of PTFSAE Short internal thread. El Short = Eo Short i (0.0625L1 Short)

Basic lengthof NPTF external full and effective length thread. L2 = (0.80 + 6.8) P
Basic length of PTF-SAE Short external full and effective length thread. L2 Short = (0.80 + 5.8) p

Basic diameter and length of thread for different sizes given in Tables 3, 4,and 5, are based on the following formulas:
Basic pitch diameter of thread a t small end of NPTF ehernal thread.

Eo = D - (0.050

+1.1)~

Basic length of NPTF internal full and effective length thread = L i Basic + LB Basic length af PTF-SAE Short internal full and effective length thread L 1 Short + L3 = where D = outside diameter of pipe p = pitch of thread

Basic pitch diameter of thread a t smalr end of PTFSAE Short external thread. Eo Short = D - (0.05D+ 1.037)P

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APPENDIX A
Table AI
SYMBOLS

Pipe-thread Symbols (See Fig A l )

DIMENSIONS

D
d

t.

...........

........... ...........

Outside diameter of pipe. . . . . . . . Inside diameter of pipe. . . . . . . . . Wall thickness of pipe . . . . . . . . . Major diameter Pitch diameter. Minor diameter

D, E,.

.......... ..........
..........

K,
Lx.

.............I . . . . . . . . . . . . -< ............ * I

i
I

REMARKS

..........

v...........
p (beta).

.......

y (gamma)

......

A

...........
..........

M.
S

...........
..........

L,.

........... T (tau) . . . . . . . .
b
E

(epsilon)

J.

...... ...........
..........

L,.

........... q ........... W ...........
Q

Length of thread from plane of pipe end to plane containing basic diameter D,, E,, or K,. Length of vanish cone (washout) threads. H l apex angle of pitch cone of taper af thread. Angle of chamfer at end of pipemeasured from a plane normal to the axis. Handtight standoffof face of coupling from plane containingvanish point on pipe. Length from plane of handtight engagement to the face of coupling on internally threaded member. Distance of gaging step of plug gage from face of ring gage for handtight engagement. Standoff. Length from center line of coupling, face of flange, or bottom of internal thread chamber to face of fitting. Width of bearing face on coupling. Angle of chamfer at bottom of recess or counterbore measured from the axis. Half apex angleof vanish cone. Length from center line of coupling, face of flange, or bottom of internalthreadchambertoendof pipe wrenched engagement. (1) Length of straight full thread (see . Table 1). (2) Length from plane of handtight engagement to small end of full internal taper thread. Diameter of recess or counterbore in fitting. Depth of recess or counterbore in fitting. Outside diameter of coupling or hub of fitting.

Subscript x denotes plane containing the diameter. For axial positions of planes see below. Subscripts S, or n designating external and internal threads, respectively, may also be used if necessary. For axialposition of planecontaining basic diameter, see below.
DEFINITIONS OF PLANES DENOTED BY SUBSCRIPT x
c =O c=1

.........

.........

C

=2

:= 3

......... .........

:= 4
:= 5

.........

.........

Plane of pipeend. Plane of handtight engagement or plane at mouth of coupling (excluding recess, if present). On British pipe threads this is designated the “gaugeplane’’ and the plane is major diameter in this designated the “gauge diameter.” Plane at which vanish threads on pipe commence. Plane in couplingreached by endof pipe in wrenched condition. (L3 is measuredfromplane containing pipe end in position of handtight engagement.) Plane containing vanish point of thread on pipe. Plane at which major diameter cone of thread intersects outside diameter of pipe.

Note: Additional special subscripts are as follows: Plane x = 6 is the plane of the pipe end for railing joints. Plane x = 7 is the plane of the API gage point at a specified length from the plane vanish point. Plane x = 8 is the plane of the large end of of ‘he “L8 thread ring gage” for the National Gas Taper (compressed-gas cylinder valve inlet connection) thread. Plane x = 9 is the plane of the small end of the ‘‘L9 thread plug gage” for the National Gas Taper (compressed-gas cylinder

inlet) thread.

12

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ASME 8 1 - 2 0 - 3 7 6 W 2 5 7 5 5 1 2 0 0 3 3 8 9 6 b

CENTERLtNE OF CONNECTION, FACE OF FLANGE,OR BOTTOM OF THREAD CHAMBER

x = 3

PLANE OF THE END OFTHEPIPE AT WRENCH TIGHT ENGAGEMENT REFERENCE PLANE ZERO

X.0

FITTING (INTERNAL THREAD)

X ' i x.5 X=

PLANE OF HANDTIGHT ENGAGEMENT PLANE OFCOMPLETE THREAD LENGTH P L A N E OF EFFECTIVETHREAD LENGTH

2

X.4

PLANE OF VANISH POINT

PIPE ( E X T E R N A L T H R E A D )

FIG A I

APPLICATION OF PIPE THREAD SYMBOLS (See Table A i )

13

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ASME 8 3 . 2 0 . 3 b 7

m

2575532 033877 0

8

m

APPENDIX B SUGGESTED TAP DRILL SIZES FOR INTERNAL DRYSEALPIPE THREADS
The drill diameters given inTable B1 are fortaperTaper pipe threads of improved quality are oband straight internal pipe threadsand willusuallytainedwhen the holes are taper reamed after drilling permit the tapping of acceptable threads in freeand before tapping. Standardtaper pipe reamers are machining brass or steel provided the drill is correctly used and, as in drilling, the actual size of the hole desharpened. When hard metals or other similar materials pends upon the material and is best determined by are to be drilled andtapped,itmay benecessary t o trial. use a drill of slightly larger diameter whereas some soft materials may require a smaller size.
HAND
ENGAGEMENT

COL 3
DIA DIA

COL 2

Table BI Suggested Tap Drill Sizes For Internal Dryseal Pipe Threads

T
Probable

Taper Pipe thread

Minor

(Mean)

Diameter At Di L, + L 3 L, From From Large Large End End
2 3 0.2374 0.3298 0.4258 0.5604 0.6901 0.8993 1.1307 1.4742 1.7132 2.1861 2.6000 3.2211

T ance

I
Drill For Use With Reamer

Thread Straight Pipe

Drill For Use Without Reamer

I
d Suggested Drill Size
5
I

I
b

a 'heoreti x1 Drill Size
4

'Ileoretical Drill Size
1 6 1 I

d Suggested Drill Size
7

Minor Diameter

C

rheoretical Drill Size

Suggested Drill Size

10 0.2444 0.3362 0.4375 0.5727 0.7082 0.9178 1.1520

1. - 27 '1 5
27 % - 18 ' a18 l'/a
-

0.0038 0.0044 0.0047 0.0049

0.2443 0.3367 0.4362 0.5708 0.7034 0.9127 1.1470 1.4905 1.7295 2.2024 2.6234 3.2445

0.2405 0.3323 0.4315 0.5659
0.6983 0.9067 1.1390 1.4805 1.7175 2.1864 2.6054 3.2245

"C"
"Q"
7/16
G ,/'

(0.242) 0.2336 (0.332) 0.3254 0.4211 (0.438) (0.562) 0.5555 (0.703) 0.6850 (0.906) 0.8933 . 1.1227 (1.141) (1.484) 1.4642 (1.719) (2.188) (2.609) (3.234)

"A"
"164
'/I6

(0;234) (0.328) (0.422) (0.563) (0.688) (0.891) (1.125) (1.469)

"D"
"R"
7/16
31/64

(0.246) (0.3 39) (0.438) (0.578) (0.703) (0,922) (1.156)

W - 14 0.0051 % - 14 0.0060 1 - 11% 0.0080
1%
-

45/64

'y16

4764
"/64

"3 /z

57/64

18 1 '
1'732

1732

11% 0.0100

L3'/64

1% - 11% 0.0120 2 - 11% 0.0160 2% - 8 0.0180 3 0.0200 - 8

!yl6
!3'/64

1,764

1.7012 145/64 (1.703) 2.1701 211/64 (2.172) 2.5820 237/64 (2.578) 3.2011 3'3/64 (3.203)

a Column 4 values equal column 2 values minus column 1 values. b Column 6 values equal column 3 values minus column 1 values. c Column 1 O values equal coIumn 8 values minus column 1 values. d Some drill sizes listed may not be standard drills, and in somecases, standard metric drill sizes may be closer to the theoretical drill size.

14

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APPENDIX C SPECIAL SHORT, SPECIAL EXTRA SHORT, FINE, AND SPECIAL DIAMETER-PITCH COMBINATION DRYSEALPIPE THREADS

The SAE Dryseal pipe thread series are b-ased on thread length. Full thread Iengths and clearance for Dryseal Standard and SAE SHORT series are shown in Tables 3, 4, 5, 6, and 7 of the standard, and the differences between them are described in the text under the series headings. These full thread lengths and clearances should be used in design applications wherever possible. Design limitations, economy of material, permanent installation or other limiting conditions may not permit the use of either of the full thread lengths and shoulder lengths in the preceding tables for the above thread series. To meet these conditions two special thread series have been established as shown in Fig. C l and the deviations from standard practice are described below.
C.l Dryseal Special Short Taper Pipe Thread, PTFSPL SHORT

ternal thread length and taper cannot be used. Tolerance must be altered and co-ordinated as described in paragraph C.3. The designation of this series thread is as follows: ‘/B -27 PTF-SPL EXTRA SHORT

C 3 Limitations of Assembly . Standard combinations and applications of the various series Dryseal pipe threads are given in the preceding thread descriptions. However, where special combinations are used, additional considerations as outlined below must be observed. These should be designated withthe suffur “SPL” and gaging tolerance should be specified.
PTF SAE SHORT
” _

PTF SPL SHORT
EXTERNAL R F SpL EXTRA SHORT EXTERNAL

MAY * ASSEMBLE WITH

INTERNAL

NPSF INTERNAL PTF SPL SHORT
INTERNAL PTF SPL EXTRA SHORT INTERNAL

Threads of thisseries conform in all respects to the PTFSAE SHORT threads except that the full thread length has been further shortened by eliminating one thread at the large end of external threads or eliminating one thread at the small end of internal threads. Gaging is the same as for PTF-SAE SHORT except the L2 ring thread gage for external thread length and taper or the L3 plug thread gage for internal thread length and taper cannot be used. Tolerance must be altered and coordinated as described in paragraphC.3. The designation of this series thread is as follows:

PTF SPL SHORT
INTERNAL

PTF SPL EXTRA

EXTERNAL SHORT INTERNAL *Only when the external thread or the infernalthreador both are held closer than the standard tolerance, theexternal toward the minimum and the interna1 toward the maximumpitch diameter fo provide a minimum ofone turn hand engagement. At extreme tolerance limits the shortened full thread lengths reduce hand engagement and threads may not start to assemble. EXTERNAL MAY**

ASSEMBLE WITH

MAY *

PTF S A E SHORT

-27 PTF-SPL SHORT
C.2 Dryseal Special Extra Short Taper Pipe Thread, PTF-SPL EXTRA SHORT

PTF SPL SHORT

NFTF or NPSI
INTERNAL

PTF SPL EXTRA
SHORT EXTERNAL

ASSEMBLE
WITH MAY** ASSEMBLE ’WITH

PTF SPL SHORT
INTERNAL PTF SPL EXTRA SHORT INTERNAL

Threads of thisseries conform in all respects to the PTF-SAE SHORT threads except that the full thread length has been further shortened by eliminating two threads at the large end o f external threads or eliminating two threads at the small end of internal threads. Gaging is the same as for PTFSAE SHORT exceptthe L2 ring thread gage forexternalthread length and taper or the L3 plug thread gage for in-

NPTF EXTERNAL

**Only when the internal thread or the external threador both are held closer than the standard tolerance, the internal toward the minimum and the external toward the maximum pitch diameter to provide a minimum of two turns for wrench make-up and sealing. At extreme tolerance limits the shortened full thread lengths reduce wrench make-up and threads may not seal.

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ASME B 3 - 2 0 * 3 76

m

2 5 7 5 5 3 2 0033877

L

C.4 Dryseal Fine Taper Thread Series, F-PTF

The need for finer pitches for nominal pipe sizes has brought into use applications of 27 threads per inch to and "/8 pipe sizes. There may be other needs which require finer pitches for larger pipe sizes. It is recommended that the existing threads per inch be applied to next size larger pipe size fura fine thread series such asare shown in Table C l . This series applies to external and internal threads of full length and is suitable for applications where threads finer than NPTF are required.
C.5 Dryseal Special Diameter-Pitch Combination Series, SPL-PTF

Other applications of diameter-pitch combinations have also come into use where taper pipe threads are applied to nominal size thin wall tubing such as are shown in Table C2. This series applies to external and internal threads of fulllength and is applicable to thin wall nominal outside diameter tubing. The number of threads is uniform at 27 per inch.
C.6 Formulas for Diameter and Length of Thread

Basic pitch diameter at small end of external thread: Eo = D - (0.05D + 1 . 1 ) ~ Basic pitch diameter at large end of internal thread: El =Eo t 0.0625 L1 = D - 0.0625 P Basic pitch diameter at large end of external thread: E2 =Eo t 0.0625 L2 = D - 0.675 P Basic pitch diameter at small end of internal thread: ?I = E o - 0.0625 L 3 = D - (0.05 D t 1.2875) p Basic length of thread for hand engagement: L1 = (0.8 D + 3.8) P Basic length of full and effective thread: L2 = (0.8 D + 6.8) P Basic length of internal thread from end of hand engagement, E o , to small end of internal thread, : E3 L3 = 3p Tolerance shall be equal to plus or minus the taper of one thread on the diameter.

C.7 Designations

Basic diameter and length of thread for sizes of Dryseal Fine Taper Pipe Thread, F-PTF, and Dryseal Special Taper Pipe Thread, SPL-PTF, given in Tables C 1 and C2 are based on the following formulas: D = outside diameter of pipe or tubing p = pitch of thread Diametral taper = 0.0625 inch per inch of length

The designation for a fine thread series pipe thread should include letter F and omit letter N,for example: %-27 F-PTF. The designation fora special thread series pipe thread should include abbreviation SPL, for special and omit letter N. Also, the outside diameter of tubing should be given, for example: 34-27 SPL-PTF, OD 0.500.

16

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ASME

E2

!

Eo
*

E2
-

i DEEiG2ATED
THREAD,

DRYSEAL USA (AMERICAN) STANDARD EXTERNAL TAPER PIPE AS:

t

DRYSEAL SPECIAL SHORT EXTERNAL TAPER PIPE THREAD. DESIGNATED AS: PTF-SPL SHORT

j.
DRYSEAL USA (AMERICAN) STANDARD INTERNAL TAPER PIPE THREAD,DESIGNATEDAS: NPTF

W E THREAD

dI !
I
I

DRYSEAL SPECIAL SHORT INTERNAL TAPER PIPE THREAD, DESlGNATED AS: PTF-SPL SHORT

!

I

DRYSEAL SA SHORT EXTERNAL TAPER PIPE THREAD. DESIGNATED AS: . .‘ PTF-SAE SHORT

DRYSEALSPECIALU T R A SHORT EXTERNAL TAPER PIPE THREAD, DESIGNATED AS: PTF-SPL EXTRA SHORT

I

ONE THREAD

5
l

DRYSEALSAESHORT INTERNAL TAPER PIPE THREAD, DESIGNATED A : S PTF-SA SHORT

El

E
E
17

DRYSEAL SPECIAL EXTRA SHORT INTERNAL TAPER PIPE THREAD, DESIGNATED AS: PTF-SPL EXTRA SI-@T

FIG C l COMPARISON OF SPECIAL LENGTH DRYSEAL THREADS WITH STANDARD LENGTH DRYSEAL THREADS

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ASME 81.20-3 7b

25755320031701

b

L2+3bp SHOULDERLENGTH
AT M

, THD. P.D.

.

-

+ ONE TURN FULL THREAD
L2-"v

T

.

~

L

2

~

2

~ DIE

L

2

+

3

'

4

7

p

~

Table C l Basic Dimensions of Dryseal Fine Taper Pipe Thread, F-PTF
PD a t Small End of Ext Thread (E, 1 PD at Large End of Int Thread

Size

Pitch (P)

(E, 1
Inch

Inch
% -27 "/8 - 27 % -18 ?4 - 1 8
1 - 14 1% - 14 1% - 14 2 - 14

Inch
1.49826 1.63301 1.77655 1.98597 ..23173 ..57550 ..81464 !.28794

T

PD at Large End

PD a t Small

- " - Vanish Thds I - Length Hand of Full Engagement Threada,b (L,) Int (L, + L 3 ) & Ext (L,) Thd
7.23 7.34 7.47 7.64

of Ext
Thread (E, 1 Inch

End of Int Thread
(E3

Thread

for
Shoulder Clearance :v+l p + %pl
Draw

-

Inch
1.49132 L62607 L76613 L97555 .21834 .56211 .80125 !.27455

).O3704 1.03704 ).O5556 1.05556 1.07143 ).O7143 1.07143 ).O7143

L50807 b.64307 ).79205 ..o0210 .25342 .S9837 ..83839 !.31338

D.51501 D.65001 0.80249 1.01247 1.26679 1.61181 1.85176 2.32675

a External thread tabulated full thread lengths include chamfers not exceeding one pitch (thread) length. b Internal thread tabulated full thread lengths do not include countersink beyond the intersection of the pitch line and the chamfer cone (gaging reference point).

L
0.157 0.161 0.248 0.258 4.23 4.34 4.47 4.64 0.268 0.272 0.415 0.424 0.347 0.366 0.380 0.407 4.85 5.13 5.32 5.70 0.561 0.581 0.594 0.621

" L

Outsidc Dia of Fitting (D, 1

Pipe

@)

"

Inch Thd
3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 0.546 0.681 0.850 1.060 1.327 1.672 1.912 2.387 0.540 0.675 0.840 1.050 1.315 1.660 1.900

O. ,1111 ,1111 O. O. ,1667 O ,1667
,2143 O. O, ,2143 ,2143 O, O. .2143
L

-

7.85 8.13 8.32 8.70

18

"

7,

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ASNE BI-20.3 76

m

2595512 0011902 B

m

AT MAX INT THO P D

Table C2 Basic Dimensions of Dryseal Special Taper Pipe Thread, SPL-PTF (For Thin Wall Nominal Size O D Tubing)
PDat PDP DP D a t at at Small Large Large Small of End of End of End of Pitch End (P) Ext Int Ext Inf Thread Thread Thread Thread (E,) ~(E,) (E,) ( , E)
~ ~ ~

Tubing Dia ( W

~

Size

Hand Engagement

(L,l
Inch Thd
4.2 4.3

Length of Full Thread Int o., + Lalb 85 Ext (L2 )a Thd Inch Thd
0.2667 0.2704 0.2778 0.2815 7.2 7.37.5 7.6

Thread for Draw

Inch Inch Inch Inch
0.500 0.625 0.750 0.875 1.000

Inch

Inch

Inch
0.47500 0.60000 0.7250(1 0.85000 0.97500 0.45139 ~0.576í6 0.70093 0.82570 0.95046 0.1556 0.1593 :Os1630 OL2741 4.4 7.4 0.1667 0.1704

'

.

%-27 5/-27 3/4-27 ?/,-27 1-27

0.03704 0.45833 0.46806 0.03704 0.58310 0.59306 0.03704 0.70787 ~0.71806 0.03704 0.84306 0.83264 0.03704 0.45740 0.96805

4.5 4.6

0.1111 0.1111 0.1111 0.1111 0.111

~

3.0 3.0 3.0 3.0 3.0

a External thread tabulafed full thread lengths include chamfers exceeding one pitch (thread) length. not b Internal thread tabulafed full thread lengths do not include countersink beyond the intersection of the pitchline and thechamfer cone (gaging reference point). pipe. diamefer and thread designations. c This denotes nominal outside diameter of tubing and should not be confused with nominal
- . "

19

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ASME B1-20.3 7 b m 2575532 0031703 T M
..

AMERICAN NATIONAL STANDARDSFOR SCREW THREADS. THREADING TOOLS ANDFASTENERS
IS0 Metric Screw Threads (not n ANSI Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a B1 Report Unified Inch Screw Threads N and UNR Thread Form) .......................... ( U B1.l-1974 Gages and Gaging for UnifiedInch Screw Threads ............................... B1.2-1974 B1.5-1973 Acme Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nomenclature, Definitions and Letter Symbols Screw Threads . . . . . . . . . . . . . . B1.7-1965 (R1972) for . . . . . . . . . . . . . . . . . . . B1.8-1973 Stub Acme Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . Buttress Inch Screw Threads 7'/45" Form with 0.6 Pitch Basic Height of Thread Engagement . B1.9-1973 Unified Miniature Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.lO-1958 . B1.11-1958 (R1972) Microscope Objective Thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 5 Interference-Fit Thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.12-1972 American Gaging Practice for Metric Screw Threads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.16-1972 Hose Coupling Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B2.4-1966 (R1974) Taps-Cut and GroundThreads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B94.9-1971 Twist Drills . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B94.11-1967 (R1972) B18.1.1-1972 Small Solid Rivets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Large Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.2-1972 Square and Hex Bolts and Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.1-1972 Square and Hex Nuts ................................................. B18.2.2-1972 Socket Cap, Shoulder and Set Screws ...................................... B18.3-1969 Round Head Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5-1971 Wood Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.1-1972 Slotted Head Cap Screws. Squ?ie Head Set Screws. and Sl?ted Headless Set Screws . . . . . . B18.6.2-1972 Machine Screws and MachineScrew Nuts ................................... B18.6.3-1972 Slotted andRecessed Head TappingScrews ?nd Metallic Drive Screws . . . . . . . . . B18.6.4-1966 (R1975) . General Purpose Semi-Tubular Rivets, Full Tubular Rivets andRivet Caps . . . . . . . . . . . . . . B18.7-1972 B18.8.1-1972 Clevis Pins andcotter Pins . . . . . . . . . . . ;................................ Plow Bolts ................................ i . . . . . . . . . . . . . . . . . . B18.9-1958 (R1971) Track Bolts and Nuts ......................................... .-.B18.10-1963 (R1975) :................... B18.11-1961 (R1975) Miniature Screws ............................ Glossary of Terms for Mechanical Fasteners ........................... B18.12-1962 (R1975) Screw and Washer Assemblies-SEMS ............................... B18.13-1965 (R1975) B18.15-1969 Forged Eyebolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wing Nuts, ThumbScrews and Wingscrews ............................ BL8.17-1968 (1975) Lockwashers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21.1-1972 Plain Washers .............................................. B18.22.1-1965 (R1975) Beveled Washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.23.1-1967 (R1975)

.

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