DIN 7178-1 Supplement 1 System of cone tolerances and cone fits for conical workpieces of cones from C = 1 : 3 to 1 : 500 and lenghts from 6 to 630 mm; methods for testing of internal and external cones

standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/1973