Standard Dimensions (DIN 333, Form A)
Standard center drills are readily available in the following sizes:
| Model (Size) | Pilot Diameter (d1) | Shank Diameter (D) | Standard Overall Length (L) |
|---|---|---|---|
| A1 | 1.0 mm | 3.15 mm | 31.5 mm |
| A2 | 2.0 mm | 5.0 mm | 40.0 mm |
| A3 | 3.15 mm | 8.0 mm | 50.0 mm |
| A4 | 4.0 mm | 10.0 mm | 56.0 mm |
| A5 | 5.0 mm | 12.5 mm | 63.0 mm |
Extra-Length Dimensions
"Extra-length" center drills (also known as "long series") have significantly longer overall lengths to help you reach deep or recessed areas for center drilling.
| Model (Size) | Pilot Diameter (d1) | Shank Diameter (D) | Extra-Length Overall (L) Examples |
|---|---|---|---|
| A4 | 4.0 mm | 10.0 mm | 100 mm, 120 mm, 150 mm, 200 mm |
| A5 | 5.0 mm | 12.5 mm | 120 mm, 150 mm, 200 mm |
Non-returnable
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