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| Common Drill Bits Specifications (mm) | φ98-153 | φ120-165 | φ165-230 | φ203-245 | φ245-275(315) | |
|---|---|---|---|---|---|---|
| Drill Bits Parameters | Number of blades | 4 | 4 | 5(6) | 6 | 6(8) |
| Main cutter size (mm) | 13.44(15.88) | 15.88 | 15.88 | 15.88 | 15.88 | |
| Number of main cutters | 12 | 14 | 16~21 | 24 | 24~32 | |
| Gauge cutter | 13*05PDC | 13*05PDC | 13*05PDC | 13*05PDC | 13*05PDC | |
| Number of water holes | 4 | 4 | 5(6) | 6 | 6(8) | |
| Drilling Regime Parameters | Recommended drill pressure (KN) | 30-50 | 30-60 | 40-80 | 50-90 | 60-100 |
| Recommended speed (RPM) | 150 ~200 | 150 ~200 | 120~～180 | 100~160 | 100~160 | |
| Recommended displacement (L/min) | 150～260 | 150～260 | 180～300 | 200～350 | 200～400 | |