This standard describes the determination proces for the necessary size, d, for a 60° centre hole manufactured in accordance with ISO 6411, and of type A and B for machining parts with maximum weight up to 28.000 kg. For centre holes of type R it is recommended to select a value of the size, d, which at least is one step higher than the d-value determined according to this standard.
DS 2389:1994 history
1994DS 2389:1994 Centre holes 60 ° - Determination of dimensions
1993DS 2389:1993 Centre holes 60 degree. Determination of dimensions