For nominal diameters DN 120, 150, 175, 300 and 350 mm, the hole diameter and number of holes have been adapted to the next higher standard diameter (120=125, 150=160, 175=180, 300=315, 350=355 mm)
For nominal diameters 80, 100, 140, 160, 200, 224, 250, 400, 450, 500, 560, 630, 710 and 800 the pitch circle diameter, the hole diameter and the number of holes conform to DIN 24154-2
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