Typically made of high-speed steel (HSS) or carbide, it features a short guiding drill tip (with a 60℃ or 90℃ included angle) followed by a larger-diameter cylindrical centring section.
High-Precision Guidance: Its unique shape ensures the creation of precisely positioned, concentric pilot holes.
Drill Bit Guidance: Effectively guides subsequent drill bits or lathe tailstock centres, preventing deflection or slippage and enhancing subsequent machining accuracy.
Efficient One-Step Operation: Completes centre hole drilling in a single step, eliminating the need for multi-stage processing.
| MK10 | I | d | t | r | d1 | ||||
| 60202 | △ | 6.2 | 6.35 | 2.38 | 0.2 | 2.8 | 0.01~0.12 | 0.05~3.00 | |
| 60204 | △ | 6.0 | 6.35 | 2.38 | 0.4 | 2.8 | 0.02~0.15 | 0.10-3.00 | |
| 60208 | △ | 5.6 | 6.35 | 2.38 | 0.8 | 2.8 | 0.02~0.20 | 0.10~4.00 | |
| 09T302 | △ | 9.4 | 9.525 | 3.97 | 0.2 | 4.4 | 0.02-0.20 | 0.05~3.00 | |
| 09T304 | △ | 9.2 | 9.525 | 3.97 | 0.4 | 4.4 | 0.02~0.30 | 0.10~5.00 | |
| 09T308 | △ | 8.8 | 9.525 | 3.97 | 0.8 | 4.4 | 0.03~0.50 | 0.10~5.00 | |
| 120402 | △ | 12.6 | 12.7 | 4.76 | 0.2 | 5.5 | 0.02~0.30 | 0.05~4.00 | |
| 120404 | △ | 12.4 | 12.7 | 4.76 | 0.4 | 5.5 | 0.03~0.50 | 0.10~5.00 | |
| 120408 | △ | 12.0 | 12.7 | 4.76 | 0.8 | 5.5 | 0.04~0.80 | 0.10~5.50 | |
Significantly improves positioning accuracy and efficiency in subsequent drilling or turning operations, reduces drill bit wear and breakage risks, and is an indispensable tool for ensuring precision machining (e.g., for shaft-type components).
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