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Drilling Tools
Centre Drill
GARANT Long Centre Drill (HSS-E, Type A)
Precision Ground and Relief-Ground 60° Centre Drilling Tools
Overview & Application
The GARANT Long Centre Drill (Type A) is expertly ground from solid stock and relief-ground to ensure high accuracy and long tool life. Constructed from HSS-E (Cobalt-alloyed High-Speed Steel), these tools are ideal for creating precise 60° center holes, essential for accurate turning and cylindrical grinding operations.
Technical Highlights
- • Geometry: 2-flute design with a 60° countersink angle.
- Tolerance: k12 nominal diameter accuracy.
- • Shank: Parallel shank (h7 tolerance) for stable mounting.
- • Material: Uncoated HSS-E.
Specification Matrix
| Article | Nominal Ø | Workpiece Ø | Shank Ø |
|---|---|---|---|
| 111290 2 | 2 mm | 15–20 mm | 6 mm |
| 111290 3 | 3 mm | 20–40 mm | 8 mm |
Operational Guidance
These tools feature a uniform 80 mm overall length. When working in steel (< 900 N/mm²), apply feed rates of 0.02 mm/rev (for 2 mm Ø) or 0.03 mm/rev (for 3 mm Ø) to maintain accuracy.
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