British Thread Fittings — BSP, BSPP & BSPT Guide
How to identify British Standard Pipe (BSP) fittings: BSPP parallel threads and BSPT tapered threads, the 55° Whitworth thread form, G and R designations, and why BSP is not interchangeable with NPSM or NPT(F).
Other fitting tiles
British Standard Pipe (BSP) is one of the most common fitting styles used worldwide. BSP is used on some of the world's most recognized machinery such as Case IH, JCB, New Holland, and John Deere. British Standard Pipe threads are available in two versions, British Standard Parallel Threads (BSPP) and British Standard Pipe Taper (BSPT).
BSPP (British Standard Parallel)
BSPP is very similar in appearance to American National Pipe Straight Mechanical (NPSM) fitting but the two are NOT interchangeable. While both NPSM and BSPP seal on the cone seat of the male / tapered nose of the female, the threads are different in most sizes.
BSPT (British Standard Pipe Taper)
BSPT is also very similar in appearance to American National Pipe Taper (Fuel) (NPT(F)) adapters but just like the BSPP/NPSM fitting connection mentioned earlier, the BSPT/NPT(F) are NOT interchangeable due to subtle differences in size and thread form.
BSP is not interchangeable with NPSM or NPT(F)
BSPP looks like NPSM and BSPT looks like NPT(F), but neither pair is interchangeable. The differences in size and thread form are subtle enough to force-start a mismatched connection, then leak or strip. Always confirm the standard before mating.
JIS 30° Flare
Japanese Industrial Standard JIS 30° Flare uses the same thread size and form as the British Standard Pipe family of fittings. The JIS 30° Flare is very similar in appearance to the North American JIC 37° fitting (SAE J514) but is NOT interchangeable due to the difference in the sealing angle and the thread form and size. The JIS 30° fitting connection features a 30° chamfered seat angle on the leading end of the male fitting that fits snugly against the 30° angle machined into the bottom of the female fitting forming a metal-to-metal seal when tightened.
G and R thread designations
Reading G and R callouts
The thread sizes are often expressed as fractional dimensions preceeded by the letters "G" or "R", where "G" represents a parallel thread and "R" represents a tapered thread. Example: BSPT 5/8-14 can be designated by R 5/8 and BSP 1/16-28 can be designated by G 1/16.
Fitting Tiles
Our Fitting Tiles are a simple format for assisting customers in identifying fittings and adapters. The color guide is on the rear decal of the Easy Pack case. The design allows new customers and green employees to identify the adapter family quickly. In addition, a Q.R. code is available to read tutorials, watch thread videos and gain more knowledge.
