DIN 2246-2
DIN 2246-2 Geometrical product specifications (GPS) - "GO" plug gauges - Part 2: For holes over 120 mm up to 200 mm nominal diameter
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2008