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G-Series pipe thread chart (British standard pipe parallel was BSPP & BSPF) and PF-Series pipe thread chart (Japanese pipe parallel).
In the modern standard metric version, it is simply a size number, where listed diameter size is the major outer diameter of the external thread. For a taper thread, it is the diameter at the "gauge length" (plus/minus one thread pitch) from the small end of the thread.
BSPP G 1/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. All the relevant data for this tread in one spot.
Thread size refers to the nominal bore of the pipe. Subtract approx. 1/4″ (6mm) from thread diameter measurement for nominal pipe size. Pitch is Threads Per Inch (TPI). “Gas”, “R” & “G” also refer to BSP. “Male Iron (Pipe)” may be BSP or NPT.
BRITISH STANDARD PIPE DIMENSIONS FOR UNIFIED THREAD SIZES. MALE TAPERED THREAD SIZE (inch) CORRESPONDING PIPE. MALE TAPERED THREAD SIZE (inch) DN (mm) ACTUAL OD (mm) WALL (mm) 1/16. 3.
The most common types of Whitworth thread are: BSPP (G) – British Standard Pipe Parallel. BSPT (R/Rp) – British Standard Tapered Pipe, for pipes and tapered thread. An appropriate sealing compound can be used in the thread to ensure a leakproof joint.
British Standard Pipe Parallel Thread, with sealant compound, (parallel, cylindrical), external = G. The flank angle is 55°. Advertising: Whitworth Pipe Thread DIN ISO 228, BSP, British Standard Pipe, English Thread, Pipe, Fitting.
