PG

Important note about PG Screw Ring Thread Gauges

The standard: DIN 40431 P1 STEEL CONDUIT THREAD; THREAD GUAGES, "GO" AND "NOT GO" THREAD RING GUAGES specifies the requirements for the thread ring gages. A unique aspect of the Pg Steel Conduit Thread Ring Gage is that the NOGO ring is a plain cylindrical gage. This actually works because as the thread is machined the crest of the thread form comes to a point. As the thread size is changed the position of the point changes and thus can be measured. The GO ring works in the normal manner by checking the maximum material condition.