Cap Screw Counterbore
Mod 301- HSS 3 Flute Solid Pilot Straight & Taper Shank Counterbores
Straight Shank
For Socket Head Cap Screws
Tool Material: HSS M2
Provides good wear resistance in mild steels and nonferrous materials such as plastics, aluminum, copper, brass and bronze
| Module # | Screw | Cutter | Pilot | Shank |
| Size | Dia. (In.) | Dia. (In.) | Dia. (In.) | |
| 301 | # 6 | .242 | .150 | 7/32 |
| 301 | # 8 | 19/64 | 11/64 | 1/4 |
| 301 | #10 | 21/64 | 13/64 | 5/16 |
| 301 | 1/4 | 13/32 | 9/32 | 3/8 |
| 301 | 5/16 | 1/2 | 11/32 | 7/16 |
| 301 | 3/8 | 19/32 | 13/32 | 1/2 |
| 301 | 7/16 | 11/16 | 15/32 | 1/2 |
| 301 | 1/2 | 25/32 | 17/32 | 3/4 |
| 301 | 5/8 | 31/32 | 21/32 | 3/4 |
| 301 | 3/4 | 1-3/16 | 13/16 | 1 |
| 301 | 1 | 1-9/16 | 1-1/16 | 1 |