British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT)
British Standard Pipe - Wikipedia
British Standard Pipe Thread (BSPT)
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British Std Taper Pipe
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Math Tools - Pipe Diameters, Threads and Sizes
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Automation and Instrumentation: British Standard Pipe Tapered (BSPT)
British Thread Types
BSP Thread Size Information | BSPT | British Standard Pipe Thread | Stevenson Plumbing & Electrical Supplies