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.
Thread data - metric, unified, ACME and others.
NPS pressure tight straight pipe threads with lubricant or sealer.
NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3.
British Brass Thread is an imperial unit based screw thread.
Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.
Dimensions of ISO metric trapezoidal screw threads.
Pressure-tight joints made on the pipe threads.
Applied threaded standards used for piping connections.
Piping thread standards.
BSPP (G) - British Standard Pipe Parallel and BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - G/R/Rp.
Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads.
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