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British Standard Brass

British Brass Thread is an imperial unit based screw thread

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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.

SizeOutside Diameter
Core Diameter
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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