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BSPP G 1/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. All the relevant data for this tread in one spot.
G-Series pipe thread chart (British standard pipe parallel was BSPP & BSPF) and PF-Series pipe thread chart (Japanese pipe parallel).
Two types of threads are distinguished: Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP; originally also known as [1] British Standard Pipe Fitting thread / BSPF and British Standard Pipe Mechanical thread / BSPM), which have a constant diameter; denoted by the letter G.
Although, as indicated in the designation, all pressure connections have a thread with the nominal diameter G 1/4″, the types of sealing discern so greatly that in some cases a compatibility is not possible. Thus, G 1/4 per EN 837 is usually metallically sealed, even in front of the thread.
NOMINAL THREAD SIZE (inch) MAJOR DIAMETER (mm) MINOR DIAMETER (mm) TPI G 1/16 G 1/8 G 1/4 G 3/8 G 1/2 G 3/4 G 1 G 2 G 3 6.561 8.566 11.445 14.950 18.631 24.117 30.291 56.656 84.962 7.723 9.728 13.157 16.662 20.955 26.441 33.249 59.614 87.884 28 28 19 19 14 14 11 11 11 British Standard Pipe - BSPP & BSPT
4 kwi 2023 · Thread G: The G (Whitworth) thread, also called BSPP (British Standard Pipe Parallel) is a parallel thread used in Europe. It is used for pipe fittings and hydraulic fittings. The G thread is characterized by its right angle and size indicated in inches. Here is a correspondence table for G fittings, with male and female diameters in millimeters:
Parallel Pipe Thread (G) Profile. Thread form angle : 55°. P : Pitch. n : TPI. H : Height of fundamental triangle. h : Height of thread. r : Radius at the top and bottom of the thread. D : Major diameter of internal thread. D1 : Minor diameter of internal thread.
