Thread Check, Inc. offers a complete line of AGD ‐ American Gage Design, unified adjustable thread ring gages. Thread ring gages and set plugs are manufactured per ANSI/ASME B1.2. Thread ring gages are manufactured to an X tolerance in 1A, 2A and 3A Go members and 2A and 3A No go members. Unified Series thread ring gages are available in UNC, UNF, UNEF, and specials. AGD adjustable style thread ring gages can only be calibrated by means of a set plug. 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 are traceable to N.I.S.T.