340
Appendix
Appendix
Installation & Maintenance
Assemblies
Equipment & Accessories
Fittings
Hoses
British Thread Types
Fitting Identification
Fitting Standards
Male
Female
BSPT (British Standard Pipe Tapered)
Identification
The British Standard Pipe Tapered is very similar to
the NPTF fitting. Male fitting has a tapered thread. BSP
threads are also known as Whitworth threads.
Seal
The BSPT male can be connected with a BSPT female or
BSPP female. In either case, the seal is made within the
threads through thread distortion. A thread sealant is
recommended.
Comments
The BSPT fitting, although similar to the NPTF fitting, is
not interchangeable. The thread pitch is different in most
cases and the thread angle is 55 degrees for the BSPT,
versus the 60 degrees found on NPTF threads.
Male
Female
BSPP (British Standard Pipe Parallel)
Identification
The British Standard Pipe Parallel would be similar to the
NPSM fitting. BSP threads are also known as Whitworth
threads.
Seal
The BSPP male will connect with the BSPP female or
female port. Both male and female have a straight thread
and 30-degree seat and chamfer. The seal takes place by
compression of the 30-degree seat on the chamfer. The
threads hold the connection mechanically.
Comments
The BSPP fitting, although similar to the NPSM fitting, is
not interchangeable. The thread pitch is different in most
cases and the thread angle is 55 degrees for the BSPP,
versus the 60 degrees found on NPSM threads.
Thread Identification Table
BSPT and BSPP
Dash Size
Nominal
Size
Thread
Size
Female
Thread ID
Male
Thread OD
in.
in.
in.
-2
1/8
1/8-28
11/32
3/8
-4
1/4
1/4-19
15/32
17/32
-6
3/8
3/8-19
19/32
21/32
-8
1/2
1/2-14
3/4
13/16
-10
5/8
5/8-14
13/16
29/32
-12
3/4
3/4-14
31/32
1
p
-16
1
1-11
1
s
1
u
-20
1
e
1
e
-11
1
x
1
z
-24
1
f
1
f
-11
1
1
1
d
-32
2
2-11
2
s
2
u
Female Port