INTERCHANGEABLES COUNTERBORES TYPE 0N

COUNTERBORES WITH 4 FLUTES in HSS HRC 63 from Ø 7 to Ø 24.

Counterbores with 4 flutes type N group 0 in HSS hardness 63 HRC, from Ø 7 to Ø 24. Helix angle 40°. You can fit them in all the Polledri holders of the same group. These counterbores are manufactured to solve all the problems of cylindrical head screw counterboring and spot-facing. With rotatory pilots or drills you can execute simultaneous operations. We advise them for materials with short and normal chip.