What is the BSPP thread
BSPP (British Standard Parallel Pipe) is most popular in the UK, Europe, Asia, Australia, New Zealand and South Africa. It is a parallel thread fitting that uses a bonded seal ring to do the sealing. This bonded ring seal is sandwiched in-between a shoulder on the male fitting and the face of the female fitting and is squeezed in place. BSPP pressure gauges have a longer male thread and use a copper crush washer that is squeezed in between the bottom of the male fitting and the bottom of the female BSPP hole forming a pressure tight seal. No thread sealant is needed to form a seal.
What is the BSPT thread
BSPT (British Standard Pipe Taper) is similar to NPT except there are important differences. The angle across the flanks of threads (if you sliced the fitting in half long-ways and measured the angle from root to crest to root) is 55 degrees instead of 60 degrees as it is for NPT. Another important difference is that for many BSPT pipe sizes the thread pitch is different than NPT. Thus an NPT male will sometimes fit into a BSPT fitting or vice versa but they will not seal. This is a popular fitting in China and Japan but is very rarely used in North America unless the equipment to which it is attached was imported. Thread sealant is needed to seal the male and female fitting together
BSPT thread also called R and PT thread.
R thread include Rc. Please see below R thread specifically as follows:
Rp – Inch sealed cylindrical internal thread
Rs – Inch sealed cylindrical external thread
Rc – Inch sealed taper thread
R1 – Imperial seal cone external thread, and Rp with the use of, that is Rp/R1 column/cone fit
R2 – Imperial seal cone external thread, and Rc with the use of, that is Rc/R2 cone / cone with
QC Hydraulic is supplying hydraulic fitting with BSPP and BSPT, if any demand or questions about BSP hydraulic fittings, please contact us.