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MIL-STD-117B, MILITARY STANDARD: GAGE, RING, THREAD, LO (NOT GO) 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, LO (not go), right-hand thread ring gages for the inspection of the minimum limits of Unified Standard classes 1A, 2A, 3A and American National Standard classes 1, 2, 3 external threads.