BSP Hydraulic Adapters have a 55 degree thread angle and are widely used in hydraulic applications. BSP standard pipe parallel threads are used for fittings where pressure-tight joints are not made on the thread, i.e., a peripheral seal used. Such as, O-ring seal, Bonded Seal, 60 cone seal.
British Fittings are manufactured using British threads such as British Standard Pipe Parallel (BSPP) and British Standard Pipe Tapered (BSPT).
BSP hydraulic fittings are mostly popular in Europe and Asia.