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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.
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 Jargon, calculations, and charts defining BSP threads differ greatly from standard metric and inch threads. This webpage will explain the difference between the various series, how each parameter is defined, and show how to find the correct basic dimensions and tolerances for each thread. Table of Contents.
British Standard Pipe BSP thread chart, BSP thread chart showing TPI and drill sizes.
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.
For accurate measurement of four-bolt flanges, use a caliper to measure the port hole diameter of the bolt, and note that number. Then, measure the distance from center to center of the bolt holes, and note the longest spacing.
