BSPT Taper Pipe Taps
BSPT (British Standard Pipe Taper) 55 degree thread form taps produce an internal thread which joined with an external BSPT thread needs no sealant to produce a pressure tight joint
BSPT taps produce a thread with a 55 degree thread form. The true threadform is rounded equally at the crest and root by circular arcs, however the taps producing the internal thread are often truncated or modified. Provided the external thread is also modified the flanks of the thread mate to form the required seal.