shell-end counterbore / solid / thread / HSS-E
Spiral fluted counterbore with fixed pilot.
DIN 1866A / ISO 4205.
For through hole quality fine (ISO values) to DIN 69.
For counterboring screw heads to ISO 2009, 2010, 7046, 7047 (DIN 965, 964, 965, 966).
33 m/min cutting speed (vc) in aluminium cast alloys < 10% Si up to 600 N/mm2, short chipping aluminium, low alloy copper up to 400 N/mm2.
28 m/min cutting speed (vc) in general structural steels up to 500 N/mm2.
27 m/min cutting speed (vc) in unalloyed quenched and tempered steels up to 750 N/mm2, unalloyed case-hardening steels up to 750 N/mm2, nitriding steels up to 750 N/mm2.
Applicable with emulsion with at least 4 % grease content (for tapping at least 8 %).
Size 4.6 × 2.4 - not defined in DIN.