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British Standard Brass Threads

British Brass Thread is an imperial unit based screw thread.

British Brass Thread is an imperial unit based screw thread that adopts the Whitworth thread form with pitch 26 TPI and a thread angle of 55 degrees for all diameters.

British Standard Brass Threads
SizeOutside Diameter
(inches)
Core Diameter
(inches)
DepthTPI
1/8" 0.125 0.0757 0.0246 26
1/4" 0.250 0.2007 0.0246 26
3/8" 0.375 0.3257 0.0246 26
1/2" 0.500 0.4507 0.0246 26
5/8" 0.625 0.5657 0.0246 26
3/4" 0.750 0.7007 0.0246 26
7/8" 0.875 0.8257 0.0246 26
1" 1.000 0.9507 0.0246 26
1-1/8" 1.125 1.0757 0.0246 26
1-1/4" 1.250 1.2007 0.0246 26
1-1/2" 1.500 1.4507 0.0246 26

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