GGG-G-15C, FEDERAL SPECIFICATION: GAGE BLOCKS AND ACCESSORIES (20 MAR 1975)

GGG-G-15C, FEDERAL SPECIFICATION: GAGE BLOCKS AND ACCESSORIES (20 MAR 1975)., This specification covers precision gage blocks up to and including 20 inches (500 mm) in length, and accessories, in either the inch or the metric system for use by laboratories, inspection ships, or as work gages for high accuracy machining operations.