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.

G (supposedly from German/English “Gas”) are the cylindrical pipe threads with 55°apex angle used on originally inch based pipes.

BSPP thread is often referred to as “G” threads, the two types of thread are the same parallel straight, the threads are measured in threads per inch. Therefore, BSPP is the same as G.

QC Hydraulics is producing and supplying many kinds of BSPP fittings in high quality stainless steel, all fittings meet the international standard. Please feel free to contact us if you are interested.

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