AS 1913-1976
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.
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