British Standard Cycle Threads
British Standard Cycle is a British Imperial screw thread standard.
British Standard Cycle is a British Imperial screw thread standard made for bicycle and motorcycle applications.
Diameter (in) | TPI | Pitch (in) | Outside Diameter (in) | Core Diameter (in) |
---|---|---|---|---|
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.
Related Topics
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Threads
Thread data - metric, unified, ACME and others.
Related Documents
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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. -
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.