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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).
BSPP G 1/4 : Brith Pipe (BSP) Thread Dimensions and Tolerances. All the relevant data for this tread in one spot.
Gauge Length: Because of the taper angle, the diameters (major, minor, and pitch) change as we move along the thread’s axis. The gauge length is an arbitrary distance from the thread’s end at which the measurements of diameters are made.
The BSPT thread chart calculator shows sizes, dimensions, tolerances and designation for jointing pipe threads for thread sizes from 1/16 to 6 according to ISO 7-1 standard. The thread form follows the British Standard Whitworth thread.
The most common G 1/4″ threads at WIKA are surely the G 1/4 in accordance with EN 837 or DIN 3852-E. But in addition there are many other pressure connections which are all specified as G 1/4″. For example G 1/4 Ermeto and G 1/4 DIN 3852-A, just to name two.
You must find the I.D. to determine the threads per inch count for BSPT fittings. Simply obtain a caliper reading from inside the bore of the fitting. You can cross-reference the bore size on the following chart with thread pitch and threads per inch to find your desired size and its related specs.
Whitworth Parallel Pipe Thread. DIN ISO 228 (DIN 259) BSPP (British Standard Pipe Parallel) British Standard Pipe Parallel Thread, with sealant compound, (parallel, cylindrical), external = G. The flank angle is 55°. Advertising: Nominal. Diameter.
