UN Ring Gages
Thread gages inspect the pitch diameter and the functional thread for both internal and external threaded products. The thread gages listed are made to Class X tolerances per ANSI B1.2 (Unified inch screw threads). All thread gages are supplied with a Certificate of Accuracy. Thread ring gages are stocked in 2A & 3A (inch) Classes of fit. All thread gages are marked with nominal size, threads per inch (inch), class of fit, and pitch diameters.