Description
- Combined drill and countersink
- Sizes 1, 2, 3 & 4
- High speed steel
- 60° included angle
- Right hand cutting direction
This set includes four different sizes of combined drills and countersinks, commonly called center drills. They are used to produce a center hole on a workpiece for turning between centers.
Center drills are also used to start drilled holes. Because they are very stiff they don’t have a tendency to wander.
The set is high speed steel and includes sizes 1, 2, 3, and 4. These are 60 degree center drills with a right hand cutting direction. Each center drill is made of ground high speed steel for good wear resistance with a hardness rating of Rc 58 – 60.
These are the sizes that are most used by bench top machinists.
| Industry Standard | #1 through #4 |
| Included Angle | 60° |
| Overall Length | 1 1/4″ through 2 1/8″ |
| Body Diameter | 1/8″ through 5/16″ |
| Drill Diameter | 3/64″ through 1/8″ |
| Hardness | Rc 58 – 60 |
| Cutting Direction | Right hand |
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