BSPF

1/8"-28 BSPF x 1-5/16" HSS Round Die TA28108

HSS General purpose British standard pipe (BSP) - 55° degree thread form This thread is not tapered (parallel) and needs a gasket or seal to be gas/liquid tight. Used to create external pipe and conduit threads. Clarkson Osborn Catalog

1/8"-28 BSPF x 1" HSS Round Die TA28008

HSS General purpose British standard pipe (BSP) - 55° degree thread form This thread is not tapered (parallel) and needs a gasket or seal to be gas/liquid tight. Used to create external pipe and conduit threads. Clarkson Osborn Catalog