They have the same thread angle(V) of 55°.
Difference:
British standard pipe parallel
BSPP is denoted by the letter G(Gas. At first, this type of thread was mainly used on gas piping).
Sealing: It is sealed by ED.
Standard: The BSPP or G thread aligns with international standards such as ISO 228-1, DIN 259, and BS2779.
P means pitch.
British standard pipe taper( with a 1:16 taper)
BSPT is denoted by the letter R. The "R" is believed to come from the German word "Rohr," which means "pipe" in English.
Sealing: The sealing way is metal-to-metal contact with sealant to fill the gaps.
Standard: BSPT is covered by several standards, including:
ISO 7-1 (international standard)
BS EN 10226-1 (British/European standard)
PF and PT used in Japen and Kroen.
PF(Pipe Fastening) thread is specified by JIS B0202 in Japan and KS B 0221 in Kroen. The ISO standard is the ISO 228-1.
PF is also denoted by the letter G. PF is the name of BSPP in Japan. When the specifications are the same, the PF thread and G thread have the same size and can be interchanged.
PT(Pipe Taper with a 1:16 taper) thread is specified by JIS B0203 in Japan and KS B 0222 in Kroen. The ISO standard is the ISO 7-1.
PF is also denoted by the letter R and Rc. PT is the name of BSPT in Japan. When the specifications are the same, the PT thread and R thread have the same size and can be interchanged.
| NAME | BSPP | BSPT | PF | PT |
| THREAD ANGLE | 55° | 55° | 55° | 55° |
| TYPE | Parallel | tapered (1:16) | Thread | tapered (1:16) |
| PREFIX | G | R | G | R |
In addition to British pipe threads, there are also American pipe threads.
If you have any questions, please feel free to contact me(august@hydfitting.com)
