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British Standard Brass Threads

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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.

British Standard Brass Threads
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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Related Topics


Thread data - metric, unified, ACME and others.

Related Documents

ANSI B1.20.1 - NPS - American National Standard Straight Pipe Threads

NPS pressure tight straight pipe threads with lubricant or sealer.

ANSI B1.20.1 - NPT - American National Standard Taper Pipe Threads

NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3.

ASTM B43 - Seamless Red Brass Pipes - Dimensions

Standard sizes specification for seamless red brass pipes.

British Standard Cycle Threads

British Standard Cycle is a British Imperial screw thread standard.

ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads

Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.

ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads

Pressure-tight joints made on the pipe threads.

Piping Thread Standards

Applied threaded standards used for piping connections.

Threads commonly used in Piping

Piping thread standards.

Whitworth Pipe Threads

BSPP (G) - British Standard Pipe Parallel and BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - G/R/Rp.

Withworth Threads - Taps and Drill Sizes

Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads.

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