BSPT

1/8"-28 BSPT x 1-5/16" HSS Round Die TA27108

HSS General purpose British standard taper pipe (BSTP) - 55° degree thread form This thread is tapered, with an "interference" fit, unlike BSP, it needs no seals or gaskets Used to create external pipe and conduit threads. Clarkson Osborn Catalog

1/8"-28 BSPT x 1" HSS Round Die TA27008

HSS General purpose British standard taper pipe (BSTP) - 55° degree thread form This thread is tapered, with an "interference" fit, unlike BSP, it needs no seals or gaskets Used to create external pipe and conduit threads. Clarkson Osborn Catalog