Provides dimensions, designations, and some general manufacturing requirements for three types of centre drill: Type A, for centre holes without protected chamfer; Type B, for centre holes with protected chamfer; and Type R, for centre holes with radius form. It is in exact technical agreement with BS 328: Part 2, as well as ISO 866, 2540 and 2541, but has additional tolerances.

DR 75034

AS B45.2-1960

ISO 2540:1973 - Equivalent

ISO 2541:1972 - Equivalent

ISO 866:1975 - Equivalent

BS 328-2:1972 - Equivalent