Thread size chart - British standard pipe thread
Note: All of our advertised thread sizes are in British standard pipe thread size unless mentioned otherwise.
These sizes are not compatible with NPT (National Pipe Thread - the US standard)
Advertised size - Inside diameter Outside Diameter (inches) Outside Diameter (mm)
1/8" ~ 3/8 " ~ 9.5 mm
1/4" ~ 1/2 " ~ 13 mm
3/8" ~ 5/8 " ~ 16.5 mm
1/2" ~ 7/8 " ~ 20.5 mm
3/4" ~ 1 " ~ 24 mm