When metal parts are machined on centres as in turning or cylindrical grinding, it is always necessary to drill and countersink the centre holes to serve as seats or bearings in the machine centres
Combined Drill/Countersinks
Drillco 35E002A Drillco Combined Centre Drill & Countersink, #2, 5/16″ Small Diameter, 3/16″ Large Diameter, High Speed Steel-(Each)
$21.79
| Weight | 0.032 lbs |
|---|---|
| Dimensions | 0.31666 × 0.04166 × 0.04166 in |
| Material | High Speed Steel |
| Number Size | #2 |
| Small Diameter | 5/16" |
| Decimal Size | 0.3125" |
| Large Diameter | 3/16" |
| Countersink Angle | 60? |
| Overall Length | 4" |
| Finish | Bright |
| Type | Plain |