BRITISH STANDARD PIPE PARALLEL (BSPP) ALSO KNOWN AS WHITWORTH THREADS. THE BSPP FEMALE THREAD IS A PARALLEL THREAD WITH A 30° SEAT. THERE IS ALSO A TAPER THREAD, HOWEVER, IT IS NOT A POPULAR FITTING. THE BSPP THREAD IS SIMILAR TO THE NPSM FITTING, BUT NOT INTERCHANGEABLE. THE THREAD ANGLE IS 55° INSTEAD OF 60° FOUND ON THE NPSM FITTING.
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