DIN 28138-2
DIN 28138-2 Rotating mechanical seals for agitator shafts - Part 2: Steel, glass-lined - Operating data, assembly dimensions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2006
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2006