BSP vs NPT
NPT vs BSP
The difference between NPT vs. BSP threads has more to do with where you live than their applications. Both NPT and BSP are pipe thread standards for screw threads used on pipes and pipe fittings to seal pipes.
NPT
Region: United States, Canada
NPT is the abbreviation for National Pipe Thread Tapered, which is the U.S. standard for tapered threads used to join pipes and fittings. They were established as a standard by the American National Standard Pipe Thread, commonly referred to as the national pipe thread standards. NPT is one of the U.S. national technical standards for both tapered and straight thread series that are used for various purposes such as rigidity and pressure-tight sealing.
In NPT, the peaks and valleys of the threads are flat, and the NPT angle of the thread is 60 degrees
|
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 |
0.54 |
13.72 |
|
3/8 |
18 |
0.05556 |
1.41122 |
0.675 |
17.15 |
|
1/2 |
14 |
0.07143 |
1.81432 |
0.84 |
21.34 |
|
3/4 |
14 |
0.07143 |
1.81432 |
1.05 |
26.67 |
|
1 |
11 ½ |
0.08696 |
2.20878 |
1.315 |
33.4 |
|
1 ¼ |
11 ½ |
0.08696 |
2.20878 |
1.66 |
42.16 |
|
1 ½ |
11 ½ |
0.08696 |
2.20878 |
1.9 |
48.26 |
|
2 |
11 ½ |
0.08696 |
2.20878 |
2.375 |
60.33 |
|
2 ½ |
8 |
0.125 |
3.175 |
2.875 |
73.03 |
|
3 |
8 |
0.125 |
3.175 |
3.5 |
88.9 |
|
4 |
8 |
0.125 |
3.175 |
4.5 |
114.3 |
BSP
Region: UK, Europe, Asia, Australia, New Zealand and South Africa (most countries worldwide)
BSP is the abbreviation for British Standard Pipe. The thread, as defined by the ISO 228 standard, uses Whitworth standard threads, and is among a number of technical standards for screw threads that has been adopted internationally for interconnecting and sealing pipes and fittings. It has been adopted as standard in plumbing and pipe fitting nearly worldwide.
In BSP, they are rounded, and the BSP angle is 55 degrees.
|
Trade Size |
Threads per inch |
Pitch |
Major Diameter |
Minor Diameter |
|||
|
|
|
Inch |
mm |
Inch |
mm |
Inch |
Mm |
|
1/8 |
28 |
0.0357 |
0.907 |
0.383 |
9.728 |
0.3372 |
8.565 |
|
1/4 |
19 |
0.0526 |
1.337 |
0.518 |
13.157 |
0.4506 |
11.445 |
|
3/8 |
19 |
0.0526 |
1.337 |
0.656 |
16.662 |
0.5886 |
14.95 |
|
1/2 |
14 |
0.0714 |
1.814 |
0.825 |
20.955 |
0.7336 |
18.633 |
|
3/4 |
14 |
0.0714 |
1.814 |
1.041 |
26.441 |
0.9496 |
24.12 |
|
1 |
11 |
0.0909 |
2.309 |
1.309 |
33.249 |
1.1926 |
30.292 |
|
1 ¼ |
11 |
0.0909 |
2.309 |
1.65 |
41.91 |
1.5336 |
38.953 |
|
1 ½ |
11 |
0.0909 |
2.309 |
1.882 |
47.803 |
1.7656 |
44.846 |
|
2 |
11 |
0.0909 |
2.309 |
2.347 |
59.614 |
2.2306 |
56.657 |
|
2 ½ |
11 |
0.0909 |
2.309 |
2.96 |
75.184 |
2.8436 |
72.227 |
|
3 |
11 |
0.0909 |
2.309 |
3.46 |
87.884 |
3.3436 |
84.927 |
|
4 |
11 |
0.0909 |
2.309 |
4.45 |
113.03 |
4.3336 |
110.073 |
BSP vs NPT
NPT threads are common in the United States and a few other countries, BSP threads (also know as the R subset according to ISO 7) are widely used in many other countries.
BSPT -British Standard Pipe Taper
BSPP -British Standard Pipe Parallel (G)
NPT -National Pipe Taper
NPS -National Pipe Straight
R - External taper (ISO7)
Rp - Internal Parallel (ISO7/1)
Rc - Internal Taper (ISO 7)
Rs - External Parallel
While the actual specified outside diameters of American National Pipe differ slightly from those of British Standard Pipe, either thread may reliably be cut onto a pipe of its respective trade size. BSPT equivalent is NPT and BSPP’s equivalent is NPS.
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