DIN 2250-1
DIN 2250-1 Geometrical product specifications (GPS) - GO ring gauges and setting ring gauges - Part 1: From 1 mm up to 315 mm nominal diameter
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2008