pipe nipples

TYPES OF THREAD BEST FOR PIPE THREADING AND SCREW FITTINGS

There are 2 types of threads which are use for Pipe threading or in screw Pipe Fittings, Fasteners and hydraulic systems.

  1. NPT threads
  2. BSP threads.

NPT threads:

NPT thread is also known as National Pipe threads. It’s an American Pipe thread standard for the Pipe. Its s also known as MNPT, NPT, NPT, external thread for Male Pipe Fittings, external male threads and also FPT. NPT (F) is used for Female Internal thread. Usually top protect the thread from getting leak sealant is use but with PCFSCT threads you don’t even need to use the sealant, as it perfectly get connected with female fitting and there is no chance for Pipe to get the leak. It doesn’t depend on the die of the Pipe but the thread size. All the threads have the same pitch, angled as per 60 degrees, and shape is valleys and the flat peak.

 

Trade Size Threads per inch Pitch Major Diameter (O.D)
Inch mm Inch mm
1/8 27 0.03704 0.94082 0.405 10.29
1/4 18 0.05556 1.41122 0.540 13.72
3/8 18 0.05556 1.41122 0.675 17.15
1/2 14 0.07143 1.81432 0.840 21.34
3/4 14 0.07143 1.81432 1.050 26.67
1 11 ½ 0.08696 2.20878 1.315 33.40
1 ¼ 11 ½ 0.08696 2.20878 1.660 42.16
1 ½ 11 ½ 0.08696 2.20878 1.900 48.26
2 11 ½ 0.08696 2.20878 2.375 60.33
2 ½ 8 0.12500 3.17500 2.875 73.03
3 8 0.12500 3.17500 3.500 88.90
4 8 0.12500 3.17500 4.500 114.30

 

BSP threads

BSP threads are also known as British Standard Pipe Threads. BSP thread is commonly used in Australia and the countries which were affiliated with British in past. BSP thread is not base on the die of the pipe, but it is base on trade size. This can create some confusion sometimes.

Parallel BSP is known as BSPP and Tapered BSP is known is BSPT.

In BSP also all threads have the same pitch, 55-degree angle, its shape in round peaks and valley.

Trade Size Threads per inch Pitch Major Diameter Minor Diameter Gage Length
Inch mm Inch mm Inch Mm Inch mm
1/8 28 0.0357 0.907 0.3830 9.728 0.3372 8.565 0.1563 3.97
1/4 19 0.0526 1.337 0.5180 13.157 0.4506 11.445 0.2367 6.012
3/8 19 0.0526 1.337 0.6560 16.662 0.5886 14.95 0.25 6.35
1/2 14 0.0714 1.814 0.8250 20.955 0.7336 18.633 0.3214 8.164
3/4 14 0.0714 1.814 1.0410 26.441 0.9496 24.12 0.3750 9.525
1 11 0.0909 2.309 1.3090 33.249 1.1926 30.292 0.4091 10.391
1 ¼ 11 0.0909 2.309 1.65 41.91 1.5336 38.953 0.5 12.7
1 ½ 11 0.0909 2.309 1.8820 47.803 1.7656 44.846 0.5 12.7
2 11 0.0909 2.309 2.347 59.614 2.2306 56.657 0.6250 15.875
2 ½ 11 0.0909 2.309 2.96 75.184 2.8436 72.227 0.6875 17.463
3 11 0.0909 2.309 3.46 87.884 3.3436 84.927 0.8125 20.638
4 11 0.0909 2.309 4.45 113.03 4.3336 110.073

 

 

At PCFSCT we bring you latest updates , trends and information about plumbing. Keep visiting us to learn more.