DIN 2248-2
DIN 2248-2 Geometrical product specifications (GPS) - "GO" gauging members - Part 2: For holes over 40 mm up to 120 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