Thread Check, Inc. offers a complete line of AGD ‐ American Gage Design, adjustable metric thread ring gages and truncated set plugs. Thread ring gages and set plugs are manufactured per ANSI/ASME B1.16M. Thread ring gages and set plugs are manufactured to an X tolerance in a 6g class of fit. Thread set plugs are made to a class X tolerance on pitch diameter and class W tolerance on lead and angle. Metric thread ring gages and set plugs are available in coarse, fine, and special pitch sizes. Set plug gages are used to calibrate adjustable style thread ring gages. AGD adjustable style thread ring gages can only be calibrated by means of a setplug. Thread Check manufactures many types of special gages including pre‐plates, multiple starts, special leads, acme threads, buttress threads, square threads, extra length thread gages, and custom gages to print. All thread ring gages and set plugs are traceable to N.I.S.T.