How do you identify bsp and npt threads

How do you identify bsp and npt threads
Category: FACQ - Frequently Asked Coffee Questions
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Synopsis:

Hydraulic Plumbing systems use different ways of sealing depending on the geographical region, size of the pressure system and the environment. There are regional differences in sealing types as well as industry preferences. For example, most European Espresso Machines and Coffee Makers use BSPP adapters while most plumbing installations in North America use NPT fittings.

Use the charts below to measure and identify your fittings.

BSPT & BSPP
SIZE & PITCH
DASH
SIZE
BSPT MALE
THREAD OD
BSPP MALE
THREAD OD
BSPT FEMALE
THREAD ID
BSPP FEMALE
THREAD ID
inch – TPI   mm inch mm inch mm inch mm inch
1/8 – 28 -02 9,5 0.37 9,6 0.38 8,4 0.33 8,6 0.34
1/4 – 19 -04 12,8 0.50 13,0 0.51 11,2 0.44 11,9 0.47
3/8 – 19 -06 16,3 0.64 16,5 0.65 14,7 0.59 15,2 0.60
1/2 – 14 -08 20,4 0.80 20,8 0.82 18,3 0.72 19,1 0.75
5/8 – 14 -10 22,5 0.89 22,8 0.90 20,6 0.81 20,8 0.82
3/4 – 14 -12 25,9 1.02 26,3 1.04 23,9 0.94 24,6 0.97
1 – 11 -16 32,6 1.28 33,1 1.30 29,7 1.17 30,7 1.21

BSPT (British Standard Pipe Thread) is similar to NPT except there are important differences. The angle across the flanks of threads (if you sliced the fitting in half long-ways and measured the angle from root to crest to root) is 55 degrees instead of 60 degrees as it is for NPT.

British Standard Pipe Parallel thread
 
Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP; originally also known as British Standard Pipe Fitting thread/BSPF and British Standard Pipe Mechanical thread/BSPM), which have a constant diameter; denoted by the letter G.

 

NPT THREAD
SIZE & PITCH
DASH
SIZE
MALE THREAD
MINOR OD
FEMALE
THREAD ID
 inch – TPI   mm inch  mm inch
1/8 – 27 -02  9,9  0.39 8,4  0.33
 1/4 – 18 -04 13,2  0.52  11,2 0.44
3/8 – 18  -06  16,6  0.65 14,7 0.58
1/2 – 14 -08 20,6 0.81 17,8 0.70
3/4 – 14 -12 26,0 1.02 23,4 0.92
1 – 11.1/2 -16 32,5 1.28 29,5 1.16

NPT stands for National Pipe Tapered threads, also known as ANSI/ASME B1. 20.1 pipe threads. It is a U.S. standard for measuring tapered threads on threaded pipes and fittings. Threaded pipes can give an effective seal for pipes using hydraulic fluids.

Thread Dimension of Compression Fitting

Copyright - Source: https://www.ryco.com.au

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