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British Standard Cycle Thread

British Standard Cycle is a British Imperial screw thread standard.

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British Standard Cycle is a British Imperial screw thread standard made for bicycle and motorcycle applications.

Diameter (in)	TPI	Pitch (in) Load Calculator!	Outside Diameter (in) Load Calculator!	Core Diameter (in) Load Calculator!
1/4	26	0.0385	0.250	0.209
5/16	26	0.0385	0.3125	0.272
3/8	26	0.0385	0.3750	0.334
7/16	26	0.0385	0.4375	0.397
1/2	26	0.0385	0.5000	0.459
9/16	26	0.0385	0.5625	0.522
5/8	26	0.0385	0.6250	0.584
11/16	26	0.0385	0.6875	0.647
3/4	26	0.0385	0.7500	0.709
1	26	0.0385	1	0.959
1 3/8	24	0.0417	1.625	1.326

TPI = threads per inch
the thread angle is 60 degrees

The fine pitch allows high torque settings and is resistant to vibrations.

Note that the most commonly used bottom bracket thread today is 1 3/8" x 24 TPI.

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Related Topics

Threads - 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.
British Standard Brass Threads - British Brass Thread is an imperial unit based screw thread.
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 2901 - Metric Trapezoidal Screw Threads - Dimensions of ISO metric trapezoidal screw threads.
ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads - Pressure-tight joints made on the pipe threads.
Standards Applied for Piping Threads - 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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