DIN 2248-3
DIN 2248-3 Geometrical product specifications (GPS) - "GO" gauging members - Part 3: 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