Center drills also known as combined drill design with helical flutes to give long tool life and high quality to the center holes where accurate centering is essential. Type” A” center drill have an included angel of 60 degree.
Dimensions in mm
(They can also be manufactured as per US and EU standard sizes and specifications)
| Pilot Dia MM | Body Dia Inch | Overall Length Max | Min | Pilot Length Max | Min |
|---|---|---|---|---|---|
| 1.0 | 3.15 | 33.5 | 29.5 | 1.9 | 1.3 |
| 1.25 | 3.15 | 33.5 | 29.5 | 2.2 | 1.6 |
| 1.6 | 4.0 | 37.5 | 33.5 | 2.8 | 2.0 |
| 2.0 | 5.0 | 42.0 | 38.0 | 3.3 | 2.5 |
| 2.5 | 6.3 | 47 | 43 | 4.1 | 3.1 |
| 3.15 | 8.0 | 52 | 48 | 4.9 | 3.9 |
| 4.0 | 10.0 | 59 | 53 | 6.2 | 5.0 |
| 5.0 | 12.5 | 66 | 60 | 7.5 | 6.3 |
| 6.3 | 16.0 | 74 | 68 | 9.2 | 8.0 |
| 8.0 | 20.0 | 83 | 77 | 11.5 | 10.1 |
| 10.0 | 25.0 | 103 | 97 | 14.2 | 12.8 |
| Pilot Dia MM | Body Dia Inch | Overall Length Max | Min | Pilot Length Max | Min |
|---|---|---|---|---|---|
| 2.0 | 8.0 | 52 | 48 | 3.3 | 2.5 |
| 2.5 | 10.0 | 59 | 52 | 4.1 | 3.1 |
| 3.15 | 11.2 | 63 | 57 | 4.9 | 3.9 |
| 4.0 | 14.0 | 70 | 64 | 6.2 | 5.0 |
| 5.0 | 18.0 | 78 | 72 | 7.5 | 6.3 |
| 6.3 | 20.0 | 83 | 77 | 9.2 | 8.0 |
| 8.0 | 25.0 | 103 | 97 | 11.5 | 10.1 |