Material Composition: Fittings from forged or cast pressure resistant carbon steel with a zinc-trivalent anti-corrosion coating
NPT and NPSM are pipe thread. NPSM is straight while NPT is tapered. Female National Pipe Straight Mechanical (NPSM) fittings
incorporate a 30° seat against the male creating a metal leak resistant connection
Dimensional Drawings:
|
ITEM #
|
FP-1
|
FP-2
|
Thread-1
|
Thread-2
|
A
|
|
2
|
1/8"
|
1/8-27
|
.41
|
.41
|
.37° |
|
4
|
1/4"
|
1/4-18
|
.54
|
.54
|
.49
|
|
6
|
3/8"
|
3/8-18
|
.68
|
.68
|
.62
|
|
8
|
1/2"
|
1/2-14
|
.84
|
.84
|
.76
|
|
12
|
3/4"
|
3/4-14
|
1.06
|
1.06
|
.98
|
|
16
|
1"
|
1-11.5
|
1.31
|
1.31
|
1.24
|
|
20
|
1 1/4"
|
1 1/4-11.5
|
1.66
|
1.66
|
1.58
|
|
24
|
1 1/2"
|
1 1/2-11.5
|
1.90
|
1.90
|
1.82
|
|
32
|
2"
|
2-11.5
|
2.38
|
2.38
|
2.29
|
American Dryseal Pipe Threads (NPTF and NPSM)
This commonly used connection incorporates two methods of sealing. The male NPTF (Dryseal) tapered thread will mate with the NPTF
tapered female which is usually a port and seal when the special threads are crushed together. Male PTF (Short Dryseal) are identical to male
NPTF threads except that the thread lengths have been shortened by one full thread from the small end of the taper. Additional sealing aids
such as pipe dope and Teflon tape are often used with these threads. If the male has a 30 degree seat it will mate with the 30 degree cone
seat in the NPSM straight thread swivel female usually found on adapters and is mechanically held together by the threads. NPTF and NPSM are not
interchangeable with the British pipe threads.
|
NPT PRESSURE RATINGS, ANSI/ASME B 31.3
|
|
SIZE
|
NPT
|
MALE
|
FEMALE
|
|
DESIGNATOR
|
SIZE
|
PSIG
|
BAR
|
PSIG
|
BAR
|
|
1
|
1/16
|
11000
|
757
|
6700
|
461
|
|
2
|
1/8
|
10000
|
689
|
6500
|
447
|
|
4
|
1/4
|
8000
|
551
|
6600
|
454
|
|
6
|
3/8
|
7800
|
537
|
5300
|
365
|
|
8
|
1/2
|
7700
|
530
|
4900
|
337
|
|
12
|
3/4
|
7300
|
502
|
4600
|
316
|
|
16
|
1
|
5300
|
365
|
4400
|
303
|
|
20
|
1 1/4
|
6000
|
413
|
5000
|
344
|
|
24
|
1 1/2
|
5000
|
344
|
4600
|
316
|
|
32
|
2
|
3900
|
268
|
3900
|
268
|
Competitor Cross Reference:
|
Aeroquip #
|
Parker #
|
|
2048-2-2S
|
2207-2-2-S
|
|
2048-2-4S
|
2207-4-2-S
|
|
2048-4-4S
|
2207-4-4-S
|
|
2048-6-4S
|
2207-4-6-S
|
|
2048-4-6S
|
2207-6-4-S
|
|
2048-6-6S
|
2207-6-6-S
|
|
2048-8-6S
|
2207-6-8-S
|
|
2048-4-8S
|
2207-8-4-S
|
|
2048-6-8S
|
2207-8-6-S
|
|
2048-12-8S
|
2207-8-12-S
|
|
2048-8-12S
|
2207-12-8-S
|
|
2048-12-12S
|
2207-12-12-S
|
|
2048-16-12S
|
2207-12-16-S
|
|
2048-12-16S
|
2207-16-12-S
|
|
2048-16-16S
|
2207-16-16-S
|
|
2048-16-20S
|
2207-20-16-S
|
|
2048-20-20S
|
2207-20-20-S
|
|
2048-24-24S
|
2207-24-24-S
|
|
2048-32-32S
|
2207-32-32-S
|
