Pipe Thread Ring Gauge： Pipe threads are divided into parallel thread gauges and taper thread gauges. The pipe taper thread ring gauges are cut at the reference path position and screwed into the stop position to determine whether the size meets the standard. For different specification types, there are some differences in appearance and measurement methods of taper pipe thread ring gauges. For example, the specification of PT has sliced with 1 step, and the NPT has sliced with 3 steps (MIN. BASIC.MAX).
