Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
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MISSION80-254mm rock drill bits widely used in blasting hole and water well drilling.
| Matched hammer Dia. | Bit diameter | No.× Button Dia.(mm) | Air holes |
Weight (kg) |
Shank | ||
| mm | inch | Gauge | Front | ||||
| 8” | 203 | 8 | 9*18 | 6*18+4*16 | 3 | 46 |
DHD380/SD8 /QL80/MISSION80 |
| 216 | 8 1/2 | 10*18 | 6*18+7*16 | 3 | 50 | ||
| 254 | 10 | 10*18 | 6*18+9*16 | 3 | 60 | ||
| 305 | 12 | 12*18 | 12*18+12+16 | 3 | 82 | ||
Bit Face Shape Selection:
1. Drop Center Bit
For high penetration rates in soft to medium hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control.
2. Concave Face
The all-around application bit face specifically for medium hard and homogeneous rock formations. Good hole deviation control and good flushing capacity.
3. 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.
4. Flat Face Bit
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.
Carbide Button Shape Selection:
1. Semi-Ballistic Buttons
2. Ballistic Button
3. Spherical Button
4. Two-step Button
Steel:
First class special alloy steel with high strength, heat resistance and wearable
Carbide:
The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.
Quality Warranty:
Our company response for any quality problem caused by material or machining defect.