Tag Archives: 4 FLUTES

Counterbores with 4 flutes type N-N/T group 0-1-2 in HSS hardness 63 HRC, from Ø 7 to Ø 85. 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 […]