General Purpose. PTC-B1.20.1 Datasheet

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PTC-B1.20.1 Datasheet
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Part PTC-B1.20.1
Description Pipe Threads / General Purpose
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ASME PTC-B1.20.1
ASME B1.20.1-2013
Pipe Threads, General Purpose (Inch)
1 INTRODUCTION
1.1 Scope
This Standard covers dimensions and gaging of pipe
threads of the following series:
NPT
NPSC
NPTR
NPSM
NPSL
1.2 Related Standard
Hose coupling joints are ordinarily made with straight
internal and external loose-fitting threads. There are sev-
eral standards of hose threads having various diameters
and pitches, one of which is based on the American
National Standard Pipe Thread. By the use of this thread
series, NPSH, it is possible to join small hose couplings
in sizes 12 to 4, inclusive, to ends of standard pipe having
American National Standard external pipe threads,
using a gasket to seal the joint. For dimensions, toler-
ances, and gaging, see ASME B1.20.7.
1.3 Thread Designations
1.3.1 The types of pipe threads included in this
Standard are designated by specifying in sequence the
nominal pipe size, number of threads per inch, and the
thread series symbol as follows:
18–27 NPT
18–27 NPSC
12–14 NPTR
18–27 NPSM
18–27 NPSL
Decimal equivalent notation may be substituted for
fractional pipe sizes. For example
0.125–27 NPT
For left-hand threads, add “LH” to the designation.
For example
18–27 NPT–LH
Designations without “LH” will signify right-hand
threads.
1.3.2 Each of these letters in the symbols has signif-
icance as follows:
N p National (American) Standard
P p Pipe
T p Taper
S p Straight
C p Coupling
R p Railing Fittings
M p Mechanical
L p Locknut
1.4 Sealing (NPT and NPSC Only)
1.4.1 Mating Threads. Mating threads should
always contact on the thread flanks. The design toler-
ances are such that mating crests and roots may clear,
contact, or interfere (see Fig. 1). This joint may not neces-
sarily seal, unless a sealant is used.
1.4.2 Sealant. Where pressure-tight, leak-free joints
are required, it is intended that threads conforming to
this Standard be made up wrench-tight with a sealant.
To prevent galling during installation, the sealant may
have lubricating properties.
1.4.3 Tightening Torque. Due to application-specific
variables such as materials, wall thickness, operating
pressures, etc., no guidance is given in this Standard
regarding joint-tightening torque. However, joints
should be tightened beyond the hand-tight engagement
position. Advancing the joint past hand-tight creates
interference between external and internal thread flanks,
produces a seal (with the use of a sealant), and helps
prevent loosening of the joint. Overtightening may be
detrimental to the sealing function of the joint.
1.4.4 Other Considerations. Out-of-roundness of
mating parts can negatively affect their ability to seal
when made up wrench tight. The product’s elasticity
and ductility will also affect sealing.
1.4.5 Pressure-Tight Threads Without Sealant. Pipe
threads designed for pressure-tight joints that may be
used without sealing compounds (Dryseal Threads) are
covered in ASME B1.20.3.
1.5 Appendices
Useful and supplementary information that is not a
part of this Standard is presented in a nonmandatory
appendix. Specifically, the nonmandatory appendices
cover the turns of engagement method of gaging, sug-
gested prethreading hole diameters, and an explanatory
gaging matrix.
1
Copyright c 2013 by the American Society of Mechanical Engineers.
No reproduction may be made of this material without written consent of ASME.



ASME PTC-B1.20.1
ASME B1.20.1-2013
Fig. 3 American National Standard Taper Pipe Thread Notation
L4
L2
L5
V
2P
Wrench make-up
L3 L1
E3 K0 E0
E1 E5 E2 d D
6
Copyright c 2013 by the American Society of Mechanical Engineers.
No reproduction may be made of this material without written consent of ASME.



ASME PTC-B1.20.1
Table 2 Basic Dimensions of American National Standard Taper Pipe Thread, NPT (Cont’d)
O.D.
Nominal of
Pipe Pipe, Threads/
Size D Inch, n
12 3
Pitch
of
Thread,
P
4
Pitch
Diameter
at
Beginning
of
External
Thread,
E0
5
Hand-tight
Engagement
Length,1
L1
in. Threads
Pitch
Diam-
eter,2
E1
67
8
Effective Thread,
External
Length,3
L2
in. Threads
Pitch
Diam-
eter,
E3
9 10 11
Length, L1
Plane to L2
Plane,
External
Thread,
L2 L1
in. Threads
12 13
Wrench Make-Up Length,
Internal Thread
Length,
L3
in. Threads
Pitch
Diam-
eter, E3
14 15
16
Vanish
Thread,
V
in. Threads
Nominal Complete
Overall External Threads5
Length,
External Length,
Thread,4 L5
Pitch
Diam-
eter,
L4 in.
E5
Height
of
Thread,
h
Change
in
Diameter
per
Turn
of
Thread,
0.0625/n
Basic
Minor6
Diameter
at
Small
End
of
Pipe,
Ko
17 18 19 20 21 22 23 24
116 0.3125 27 0.03703704 0.27118 0.1600 4.32 0.28118 0.2611 7.05 0.28750 0.1011 2.73 0.1111
18 0.4050 27 0.03703704 0.36351 0.1615 4.36 0.37360 0.2639 7.13 0.38000 0.1024 2.76 0.1111
14 0.5400 18 0.05555556 0.47739 0.2278 4.10 0.49163 0.4018 7.23 0.50250 0.1740 3.13 0.1667
38 0.6750 18 0.05555556 0.61201 0.2400 4.32 0.62701 0.4078 7.34 0.63750 0.1678 3.02 0.1667
12 0.8400 14 0.07142857 0.75843 0.3200 4.48 0.77843 0.5337 7.47 0.79178 0.2137 2.99 0.2143
34 1.0500 14 0.07142857 0.96768 0.3390 4.75 0.98887 0.5457 7.64 1.00178 0.2067 2.89 0.2143
1 1.3150 11.5 0.08695652 1.21363 0.4000 4.60 1.23863 0.6828 7.85 1.25631 0.2828 3.25 0.2609
114 1.6600 11.5 0.08695652 1.55713 0.4200 4.83 1.58338 0.7068 8.13 1.60131 0.2868 3.30 0.2609
112 1.9000 11.5 0.08695652 1.79609 0.4200 4.83 1.82234 0.7235 8.32 1.84131 0.3035 3.49 0.2609
2 2.3750 11.5 0.08695652 2.26902 0.4360 5.01 2.29627 0.7565 8.70 2.31630 0.3205 3.69 0.2609
212 2.8750 8 0.12500000 2.71953 0.6820 5.46 2.76216 1.1375 9.10 2.79063 0.4555 3.64 0.2500
3 3.5000 8 0.12500000 3.34063 0.7660 6.13 3.38850 1.2000 9.60 3.41563 0.4340 3.47 0.2500
312 4.0000 8 0.12500000 3.83750 0.8210 6.57 3.88881 1.2500 10.00 3.91563 0.4290 3.43 0.2500
4 4.5000 8 0.12500000 4.33438 0.8440 6.75 4.38713 1.3000 10.40 4.41563 0.4560 3.65 0.2500
5 5.5630 8 0.12500000 5.39073 0.9370 7.50 5.44929 1.4063 11.25 5.47863 0.4693 3.75 0.2500
3
3
3
3
3
3
3
3
3
3
2
2
2
2
2
0.26424 0.1285
0.35656 0.1285
0.46697 0.1928
0.60160 0.1928
0.74504 0.2479
3.47
3.47
3.47
3.47
3.47
0.3896 0.1870 0.28287
0.3924 0.1898 0.37537
0.5946 0.2907 0.49556
0.6006 0.2967 0.63056
0.7815 0.3909 0.78286
0.02963
0.02963
0.04444
0.04444
0.05714
0.00231
0.00231
0.00347
0.00347
0.00446
0.95429 0.2479
1.19733 0.3017
1.54083 0.3017
1.77978 0.3017
2.25272 0.3017
3.47
3.47
3.47
3.47
3.47
0.7935 0.4029 0.99286
0.9845 0.5089 1.24544
1.0085 0.5329 1.59044
1.0252 0.5496 1.83044
1.0582 0.5826 2.30543
0.05714
0.06957
0.06957
0.06957
0.06957
0.00446
0.00543
0.00543
0.00543
0.00543
2.70391 0.4338
3.32500 0.4338
3.82188 0.4338
4.31875 0.4338
5.37511 0.4338
3.47
3.47
3.47
3.47
3.47
1.5712 0.8875 2.77500
1.6337 0.9500 3.40000
1.6837 1.0000 3.90000
1.7337 1.0500 4.40000
1.8400 1.1563 5.46300
0.10000
0.10000
0.10000
0.10000
0.10000
0.00781
0.00781
0.00781
0.00781
0.00781
0.2415
0.3338
0.4329
0.5675
0.7014
0.9106
1.1441
1.4876
1.7266
2.1995
2.6195
3.2406
3.7374
4.2343
5.2907
6 6.6250 8 0.12500000 6.44609 0.9580 7.66 6.50597 1.5125 12.10 6.54063 0.5545 4.44 0.2500 2
6.43047 0.4338 3.47 1.9462 1.2625 6.52500 0.10000 0.00781 6.3460
8 8.6250 8 0.12500000 8.43359 1.0630 8.50 8.50003 1.7125 13.70 8.54063 0.6495 5.20 0.2500 2
8.41797 0.4338 3.47 2.1462 1.4625 8.52500 0.10000 0.00781 8.3335
10 10.7500 8 0.12500000 10.54531 1.2100 9.68 10.62094 1.9250 15.40 10.66563 0.7150 5.72 0.2500 2 10.52969 0.4338 3.47 2.3587 1.6750 10.6500 0.10000 0.00781 10.4453
12 12.7500 8 0.12500000 12.53281 1.3600 10.88 12.61781 2.1250 17.00 12.66563 0.7650 6.12 0.2500 2 12.51719 0.4338 3.47 2.5587 1.8750 12.6500 0.10000 0.00781 12.4328
14 14.0000 8 0.12500000 13.77500 1.5620 12.50 13.87263 2.2500 18.00 13.91563 0.6880 5.50 0.2500 2 13.75938 0.4338 3.47 2.6837 2.0000 13.9000 0.10000 0.00781 13.6749
16 16.0000 8 0.12500000 15.76250 1.8120 14.50 15.87575 2.4500 19.60 15.91563 0.6380 5.10 0.2500 2 15.74688 0.4338 3.47 2.8837 2.2000 15.9000 0.10000 0.00781 15.6624
18 18.0000 8 0.12500000 17.75000 2.0000 16.00 17.87500 2.6500 21.20 17.91563 0.6500 5.20 0.2500 2 17.73438 0.4338 3.47 3.0837 2.4000 17.9000 0.10000 0.00781 17.6499
20 20.0000 8 0.12500000 19.73750 2.1250 17.00 19.87031 2.8500 22.80 19.91563 0.7250 5.80 0.2500 2 19.72188 0.4338 3.47 3.2837 2.6000 19.9000 0.10000 0.00781 19.6374
24 24.0000 8 0.12500000 23.71250 2.3750 19.00 23.86094 3.2500 26.00 23.91563 0.8750 7.00 0.2500 2 23.69688 0.4338 3.47 3.6837 3.0000 23.9000 0.10000 0.00781 23.6124
GENERAL NOTE: The basic dimensions of the American National Standard Taper Pipe Thread are given in inches to four or five decimal places. While this implies a greater degree of
precision than is ordinarily attained, these dimensions are the basis of gage dimensions and are so expressed for the purpose of eliminating errors in computations.
NOTES:
(1) Also length of L1 ring gage and length from gaging notch to small end of L1 plug gage.
(2) Also pitch diameter at gaging notch of L1 plug gage (hand-tight plane).
(3) Also threaded length of L1 plug gage.
(4) Reference dimension.
(5) The length L5 from the end of the pipe determines the plane beyond which the thread form is incomplete at the crest. The next two threads are complete at the root. At this plane,
the cone formed by the crests of the thread intersects the cylinder forming the external surface of the pipe (L5 p L2 − 2P).
(6) Given as information for use in selecting tap drills (see Nonmandatory Appendix B).







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