MIL-STD-116B, MILITARY STANDARD: GAGES, RING, THREAD, GO (CLASS X) AND RELATED THREAD SETTING PLUG GAGES, GO & NOT GO PLAIN PLUG MINOR DIAMETER ACCEPTANCE CHECK GAGES FOR UNIFIED & AMERICAN NATIONAL STANDARD EXTERNAL THREADS (15 MAR 1963) [NO S/S DOCUMENT]., This standard covers pertinent design data and Mil-Std Part Numbers for American Gage Design Standard, go, right-hand thread ring gages for the inspection of the maximum limits of Unified Standard classes 1A, 2A, 3A and American National Standard classes 1, 2, 3 external threads.