Bl This standard establishes the dimensions of the spindle noses with centering cone and flange. B-2 This standard distinguishes two types of spindle noses, with fastening holes in the flange (type A), and with fastening holes in the flange and in the hub (type B).
IRAM 5166-1961 history
1961IRAM 5166-1961 Shaft head with central shaft and flange