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Standard of thread for Pneumatic valvesUpdate: 2014-01-14

 here is a link to the NPT, BSP, GHT specification tables as below.

Solenoid Valve Port Options
 
Pipe Thread Acronyms
NPT
American Standard Pipe Taper Thread (aka National Pipe Thread)
FPT
American Standard Female Pipe Taper Thread
NPSC
American Standard Straight Coupling Pipe Thread
BSP
British Standard Pipe (can mean either BSPP or BSPT)
BSPP
Brittish Standard Pipe Parallel
BSPT
Brittish Standard Pipe Tapered
GHT
Garden Hose Thread (US Standard)
G Thread
British Gas - Parallel (same as BSPP)
R Thread
British Tapered (same as BSPT)
 
 
NPT - National Pipe Thread (US Standard)
Nominal Pipe Size
(inches)
Threads per Inch
(TPI)
Outside Diameter (inches)
1/8"
27
0.405"
1/4"
18
0.540"
3/8"
18
0.675"
1/2"
14
0.840"
3/4"
14
1.050"
1"
11-1/2
1.315"
1-1/4"
11-1/2
1.660"
1-1/2"
11-1/2
1.900"
2"
11-1/2
2.375"
2-1/2"
8
2.875"
 
 
BSP - British Straight and Tapered
Nominal Pipe Size
(inches)
Threads per Inch
(TPI)
Outside Diameter (inches)
1/8"
28
0.402"
1/4"
19
0.531"
3/8"
19
0.677"
1/2"
14
0.839"
3/4"
14
1.059"
1"
11
1.327"
1-1/4"
11
1.669"
1-1/2"
11
1.902"
2"
11
2.374"
2-1/2"
11
2.996"
 
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