Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
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QL80-222mm Button Bit DTH Bit For QL80 Hammer With Alloy Steel For Water Well Drilling
Shanks: QL80
| Matched hammer diameter(inch) | Bit diameter | Air Holes | Gauge | Front | Weight/KG | Bit shank | |
| mm | inch | (Qty.×Dia.) | (Qty.×Dia.) | ||||
| 8” | 203 | 8 | 3 | 9*18 | 6*18+4*16 | 46 | DHD380/SD8/QL80 /Mission80 |
| 216 | 8 1/2 | 3 | 10*18 | 6*18+7*16 | 50 | ||
| 254 | 10 | 3 | 10*18 | 6*18+9*16 | 60 | ||
| 305 | 12 | 3 | 12*18 | 12*18+12*16 | 82 | ||
Bit Face Shape Selection:
1. Flat Face
This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates an resistance to steel wash.
2. Convex Face
For high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash, and may reduce theload and wear on the gauge buttons, but poor hole deviation control.
3. Concave Face
The all-around application bit face specifically for medium hard and homogeneous rock formations.
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