Changsha Sollroc Engineering Equipments Co., Ltd
FOCUS IN MANUFACTURING OF HIGH QUALITY DTH AND RC DRILLING TOOLS.
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12" Numa Down The Hole Numa120 DTH Button Drill Bits For Rock Drilling
Product specifications: Numa120 dth bits
| For 12" hammer DTH bits shank | Bit Dia. | No Air Holes. | Gauge Buttons | Front Buttons | Weight (Kg) | Part No. | |
| mm | inch | ||||||
| DHD1120 | 305 | 12" | 4 | 12×φ18 | 36×φ16 | 152.0 | DHD1120-305 |
| 311 | 12 1/4" | 4 | 12×φ18 | 36×φ16 | 157.0 | DHD1120-311 | |
| 330 | 13" | 4 | 16×φ18 | 42×φ16 | 165.0 | DHD1120-330 | |
| 356 | 14" | 4 | 16×φ19 | 48×φ16 | 178.0 | DHD1120-356 | |
| 381 | 15" | 4 | 16×φ19 | 48×φ18 | 198.0 | DHD1120-381 | |
| SD12 | 305 | 12" | 4 | 12×φ18 | 36×φ16 | 156.0 | SD12-305 |
| 311 | 12 1/4" | 4 | 12×φ18 | 36×φ16 | 168.0 | SD12-311 | |
| 330 | 13" | 4 | 16×φ18 | 42×φ16 | 180.0 | SD12-330 | |
| 356 | 14" | 4 | 16×φ19 | 48×φ16 | 191.0 | SD12-356 | |
| 381 | 15" | 4 | 16×φ19 | 48×φ18 | 200.0 | SD12-381 | |
| NUMA120 | 305 | 12" | 4 | 12×φ18 | 36×φ16 | 152.0 | NUMA120-305 |
| 311 | 12 1/4" | 4 | 12×φ18 | 36×φ16 | 158.0 | NUMA120-311 | |
| 330 | 13" | 4 | 16×φ18 | 42×φ16 | 165.0 | NUMA120-330 | |
| 356 | 14" | 4 | 16×φ19 | 48×φ16 | 178.0 | NUMA120-356 | |
| 381 | 15" | 4 | 16×φ19 | 48×φ18 | 195.0 | NUMA120-381 | |
| NUMA125 | 305 | 12" | 4 | 12×φ18 | 36×φ16 | 170.0 | NUMA125-305 |
| 311 | 12 1/4" | 4 | 12×φ18 | 36×φ16 | 173.0 | NUMA125-311 | |
| 330 | 13" | 4 | 16×φ18 | 42×φ16 | 182.0 | NUMA125-330 | |
| 356 | 14" | 4 | 16×φ19 | 48×φ16 | 191.0 | NUMA125-356 | |
| 381 | 15" | 4 | 16×φ19 | 48×φ18 | 200.0 | NUMA125-381 | |
Product photos
it 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-round application bit face specifically for medium hard and homogenerous 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 the load and wear on the gauge buttons, but poor hole deviation control.
4. Double Gauge Face
This kind of face shape is suitable for fast penetration rates in medium to hard rock formations. Designed for high air pressures and good resistance to steel wash step gauge bit.
5. 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. Domed/Round Button
2. Parabolic/Semi-Ballistic Buttons
3. Ballistic Button
4. Sharp Button
5. Flat Button
| Shank style | Diameter in mm | Flushing holes No. | Gauge buttons | Face buttons | Approx.weight |
NUMA120 | 305 | 4 | 12*18mm | 36*16mm | 152.0kg |
| 311 | 4 | 12*18mm | 36*16mm | 158.0kg | |
| 330 | 4 | 16*18mm | 42*16mm | 165.0kg | |
| 356 | 4 | 16*19mm | 48*16mm | 178.0kg | |
| 381 | 4 | 16*19mm | 48*18mm | 195.0kg |
We are a leading manufacturer of rock drilling tools, like DTH hammers and bits, DTH drill pipes, RC hammers and bits, tophammer button bits, coupling, cross bits, drill rods located in Changsha, Hunan, China.
We have rich experience in this field of DTH hammers and bits for 20 years.
Owing to high quality, professional serivce and competitive price, we have gotten good reputation from our customers from all over the world, such as France, Spain, Italy, South Africa, Iran, Malaysia, Australia ad etc.