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This document specifies dimensions for countersinks with a tip angle of 90° made of high-speed steel. The dimensions of shapes A and B are mainly used for deburring, and those of shapes C and D for countersinking. This document has been prepared by Working Committee NA 121-01-03 AA "Senker, Aufbohrer und Reibahlen aus Schnellarbeitsstahl und Schneiden aus Hartmetall" ("Countersinks, core drills and reamers of high-speed steel and hard metal tips") at DIN Standards Committee Tools and Clamping Devices (FWS).
This document replaces DIN 335:2007-12 .