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| Common Drill Bits Specifications (mm) | Φ96/Φ98 | Φ120 | φ133 | Φ153 | |
|---|---|---|---|---|---|
| Drill Bits Parameters | Number of blades | 3（4） | 4（5） | 4（5） | 5（6） |
| Main cutter size (mm) | 13.44 | 13.44/15.88 | 13.44/15.88 | 15.88 | |
| Number of main cutters | 10~14 | 14~18 | 16~20 | 17~20 | |
| Gauge cutter | hard alloy or composite sheet | hard alloy or composite sheet | hard alloy or composite sheet | hard alloy or composite sheet | |
| Number of water holes | 3（4） | 4（5） | 4（5） | 5（6） | |
| Drilling Regime Parameters | Recommended drill pressure (KN) | 20-40 | 30-60 | 40-70 | 50-80 |
| Recommended speed (RPM) | 150~300 | 120~260 | 120~260 | 100~200 | |
| Recommended speed (RPM) | 150～300 | 200～360 | 200～360 | 250～480 | |