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SAE WEB ADDRESS
SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001
STANDARD
Submitted for recognition as an American National Standard
J476a
REV.JUN61
Issued 1921-03Revised
1961-06
Superseding J476
DRYSEAL PIPE THREADS
Foreword—This Document has not changed other than to put it into the new SAE Technical Standards Board Format.
TABLE OF CONTENTS
2
22.2
3.T runcation—Dryseal American Standard External and Internal Pipe Threads ........................................23.23.2Thread 23.23.4Straight 3
4.Dryseal American Standard Pipe Thread (NPTF)....................................................................................4
5.Dryseal SAE Short External T aper Pipe Thread (PTF—SAE Short External).........................................5
6.Dryseal SAE Short Internal T aper Pipe Thread (PTF—SAE Short Internal)............................................6
7.Dryseal American Standard Fuel Internal Straight Pipe Thread (NPSF).................................................7
8.
Dryseal American Intermediate Internal Straight Pipe Thread (NPSI) (8)
Appendix A Supplementary
9Appendix B Chaser and T 13Appendix C Dryseal Pipe .17Appendix D Special and Fine Dryseal 41Appendix E Superseded Gage Dimensions and Gaging Practice for 1/8 and 1/4 Size Dryseal Pipe Threads (46)
1.Scope—The Dryseal American Standard Taper Pipe Thread, the Dryseal American Fuel Internal Straight Pipe
Thread and the Dryseal American Intermediate Internal Straight Pipe Thread covered by this standard conform with the American Standard ASA-B2.2. The Dryseal SAE-Short T aper Pipe Thread in this standard conforms with the Dryseal American Standard T aper Pipe Thread except for the length of thread, which is shortened for increased clearance and economy of material.
The significant feature of the Dryseal thread is controlled truncation at the crest and root to assure metal to metal contact coincident with or prior to flank contact. Contact at the crest and root prevents spiral leakage and insures pressure-tight joints without the use of a lubricant or sealer.
Lubricants, if not functionally objectionable, may be used to minimize the possibility of galling in assembly.
2.References
2.1Applicable Publications—The following publications form a part of the specification to the extent specified
herein. Unless otherwise indicated the latest revision of SAE publications shall apply.
2.1.1SAE P UBLICATIONS—Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
ASA B2.2—Dryseal Pipe Threads
SAE Standards Screw Threads
3.Truncation—Dryseal American Standard External And Internal Pipe Threads For Pressure-Tight Joints
Without Lubricant Or Sealer
邢台学院魏笑雨
3.1Thread Form—The angle between the flanks of the thread is 60 deg when measured on an axial plane and
the line bisecting this angle is perpendicular to the axis of both the taper and straight threads.
Diametral taper of tapered threads is 0.75 in. ± 0.06 in. per 12.00 in. of length.
Although the crests and roots of the Dryseal threads are theoretically flat, they may be rounded provided their contour is within the limits specified in T able 1.
3.2Thread Series Symbols—The identification symbols which have been adopted for designating the various火山灰反应 Dryseal Pipe Thread Series are as follows:
NPTF for Dryseal American Standard T aper Pipe Thread.
PTF—SAE for Dryseal SAE Short T aper Pipe Thread.
NPSF for Dryseal American Fuel Internal Straight Pipe Thread.
NPSI for Dryseal American Intermediate Internal Straight Pipe Thread.
Where: N stands for American Standard [formerly American (National) Standard].
P stands for Pipe
T stands for T aper
F stands for Fuel
S stands for Straight
I stands for Intermediate
3.3Thread Designation—Dryseal pipe threads are designated by specifying in sequence the nominal size,
number of threads per inch, form (Dryseal), and symbol of the thread series.
EXAMPLE—1/8—27 DRYSEAL NPTF
1/8—27 DRYSEAL PTF—SAE SHORT
1/8—27 DRYSEAL NPSF
1/8—27 DRYSEAL NPSI
3.4Straight Pipe Threads—An assembly with straight internal 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 paramount considerations. Dryseal threads are not used on assemblies in which both components have straight pipe threads.
FIGURE 1—
4.
Dryseal American Standard Taper Pipe Thread (NPTF)—
This series applies to both the external and internal threads of all full length and is suitable for pipe jo
ints in practically every type of service. These threads are generally conceded to be superior for strength and seal. Use of the tapered internal thread in hard or brittle materials having thin sections will minimize trouble from fracture. Dimensional data for (NPTF) threads is given in T able 2. See Appendix D for limitations of assembly of NPTF threads with other series Dryseal pipe threads.
FIGURE 2—
TABLE 1—LIMITS ON CREST AND ROOT TRUNCATION
Threads per
in.Depth of Sharp-V Thread, H
in.Truncation Min Formula Truncation Min in.Truncation Max Formula Truncation
Max in.Equalivalent Width of Flat (1)
Min Formula 1.The major diameter of plug gages and minor diameter of ring gages used for gaging dryseal threads shall be truncated an amount sufficient to produce a flat width as shown in Appendix C, Tables C1-1 to C12-1 inclusive.
Equivalent Width of Flat (1)Min in.Equivalent Width of Flat (1)Max Formula Equivalent Width of
Flat (1)Max in.27 Crest 0.03208
0.047p 0.00170.094p 0.00350.054p 0.00200.108p 0.0040 Root 0.094p
0.00350.140p 0.00520.108p 0.00400.162p 0.006018 Crest 0.04811
0.047p 0.00260.078p 0.00430.054p 0.00300.090p 0.0050 Root 0.078p
0.00430.109p 0.00610.090p 0.00500.126p 0.007014 Crest 0.06186
0.036p 0.00260.060p 0.00430.042p 0.00300.070p 0.0050 Root 0.060p
0.00430.085p 0.00610.070p 0.00500.098p 0.007011-1/2 Crest 0.07531
0.040p 0.00350.060p 0.00520.046p 0.00400.069p 0.0060 Root 0.060p
0.00520.090p 0.00780.069p 0.00600.103p 0.0090 8 Crest 0.10825
0.042p 0.00520.055p 0.00690.048p 0.00600.064p 0.0080(2)2.
There is reason to doubt the correctness of the 8 threads per in. flat widths on account of the volume of metal to be displaced.
Root 0.055p
0.0069
0.076p
0.0095
0.064p
0.0080
0.088p
0.0110
5.
Dryseal SAE Short External Taper Pipe Thread (PTF—SAE Short External) For Assembly With Dryseal
American Intermediate Internal Straight (Table 6) or Dryseal American Standard Taper (Table 2) Pipe Threads—External threads of this series conform in all respects with the NPTF threads except that the full thread length has been shortened by eliminating one thread from the small end. These threads are primarily intended for assembly with NPSI internal threads but may also be used with NPTF internal threads. They are not designed for and at extreme tolerance limits may not assemble with PTF—SAE Short or NPSF internal threads. Dimensional data for PTF—SAE Short External Threads is given in T able 3. See Appendix D for limitations of assembly of PTF—SAE Short external threads with other series Dryseal pipe threads.
FIGURE 3—
TABLE 2—BASIC DIMENSIONS OF DRYSEAL AMERICAN STANDARD TAPER PIPE THREAD (1)
公装设计1.See general specifications preceding tables. For gaging methods, gages, cut thread blanks, taps, drilled hole sizes, hole depths, and full thread lengths, see Appendixes A, B, and C.NPTF
Size 1Pitch,P in.2Pitch Diameter at End of External Thread, E 0
in.3Pitch Diameter at End of Internal Thread,E 1in.4Hand Engage-ment,L 1in.5Hand Engage-ment,L 1Thread 6Length of Full Thread,(2)L 2in.72.External thread tabulated full thread lengths include chamfers not exceeding one and one-half pitches (threads) length.
Length of Full
Thread (2), L 2
Thread
8Vanish Threads V Plus Full
Thread
Tolerance Plus
Shoulder
Clearance (V + 1p +
1/2 p) in.
9
Vanish Threads V Plus
Full Thread Tolerance Pluls Shoulder Clearance (V + 1p + 1/2 p) Thread 10Shoulder Length L 2 + (3p Approx)
in.11External Thread for Draw (L 2 - L 1)in.12External Thread for Draw (L 2 - L 1) Thread 13 Length of Internal Full Thread,(3) (L 1 + L 3)in.
143.Internal thread tabulated full thread lengths do not include countersink beyond the intersection of the pitch line and the chamfer cone
(gaging reference point).
Length of
Internal Full Thread (3)(L 1 + L 3) Thread
15OD of Fitting, D 2in. 16OD of Pipe,昆明pm2.5
D
1/16-270.037040.271180.281180.160 4.320.26117.050.1139 3.0750.37500.1011 2.730.27117.320.3150.3125 1/8 -270.037040.363510.373600.1615 4.360.26397.120.1112 3.0720.37500.1024 2.760.27267.360.4070.405 1/4 -180.055560.477390.491630.2278 4.100.40187.230.1607 2.8920.56250.1740 3.130.39457.100.5460.540 3/8 -18
0.05556
0.61201
0.62701
0.240
4.32
0.4078
7.34
0.1547
2.791
0.5625
0.1678
3.02
0.4067
7.32
0.681
0.675
1/2 -140.071430.758430.778430.320 4.480.53377.470.2163 3.0280.75000.2137 2.990.53437.480.8500.840 3/4 -140.071430.967680.988870.339 4.750.54577.640.2043 2.8600.75000.2067 2.890.55337.75 1.060 1.0501 -11-1/20.08696 1.21363 1.238630.400 4.6
00.68287.850.2547 2.9290.93750.2828 3.250.66097.60 1.327 1.3151-1/4 -11-1/2
0.08696
1.55713
1.58338
浙江同志网
0.420
4.83
0.7068
8.13
0.2620
3.013
0.9688
0.2868
3.30
0.6809
7.83
1.672
1.660
1-1/2 -11-1/20.08696 1.79609 1.822340.420 4.830.72358.320.2765 3.180 1.00000.3035 3.490.68097.83 1.912 1.900 -11-1/20.08696 2.26902 2.296270.436 5.010.75658.700.2747 3.159 1.03120.3205 3.690.69698.01 2.387 2.3752-1/2 -80.12500 2.71953 2.762160.682 5.46 1.13759.100.3781 3.025 1.51560.4555 3.64 1.05708.46 2.893 2.8753 -8
0.12500
3.34062最牛妈妈
3.38850
0.766
6.13
1.2000
9.60
0.3781
3.025
1.5781
0.4340
3.47
1.1410
9.13
3.518
3.500
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