Tag Archives: COUNTERBORES

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 […]

Counterbores with 2 flutes type W group 0-1-2 in HSS hardness 63-HRC from Ø 7 to Ø 40, Helix angle 25°. You can fit them in all the Polledri holders of the same group. With rotatory pilots or drills you can execute simultaneous operations. We advise them for materials with long and normal chip.

Counterbores with 3 flutes type H-H/T group 0-1-2 in hard metal quality ISO K 30 from Ø 10 to Ø 85. Helix angle 5°. You can fit them in all the Polledri holders of the same group. These counterbores are manufactured to solve all the problems of counterboring head screw and spot facing on cast […]

Counterbores with 2 flutes type HI-HI/T group 0-1-2 in hardness and tempered steel with hardness 42 ÷ 45 HRC, from Ø 18 to Ø 60. Helix angle 7°. You can fit them in all the Polledri holders of the same group. With fixed or rotating pilots, or drills you can execute simultaneous operations. We advise […]