COUNTERBORES WITH 4 FLUTES in HSS HRC 63 from Ø 7 to Ø 24.
You can fit them in all the Polledri mandrels 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.
COUNTERBORES WITH 4 FLUTES TYPE 0N
- In HSS 63 HRC
- GROUP 0
- Helix angle: 40°
- RANGE: From Ø 7 to Ø 24
- CODE: 10.09
- EX. Ø 7: 10.09.070