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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.
Diameter: The diameters are given in inch fractions. For example, 1/4″, 3/4″, 1 1/4″. Pitch: In BSP threads, the pitch is not included in the description. BSP Designation Examples. BSPT (Per ISO 7) – Tapered Pipe Thread. BSPT stands for British Standard Pipe Tapered.
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.
To get an accurate value, ensure that the thread pitch gauge is fitting well on the threads. Record the values and compare your measurements with the figures provided in this guide. Accurate measurement of four-bolt flanges. Begin by using a caliper to measure the port hole diameter the bolt.
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.
