STI thread gauges for G pipe thread (BSP)

G is the parallel British pipe thread. It does not seal in the thread itself but through a gasket on the seating face, which is why diameter and pitch stay the same over the whole length. STI gauges check the oversized thread that later receives a thread insert. It is a series of its own, because the receiving thread is larger than the working thread that follows.

VÖLKEL offers 8 versions, from G 1/8 x 28 to G 1" x 11.