Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
To survive with high quality,to develop with non-stop innovation,to repute with thoughtful service,to brand with great sincerity
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SD12 305mm, 311mm, 330mm, 356mm, 381mm DTH Drill Bits
About Changsha Tianhe Drilling---
Manufacturer---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.
Experience--in this field of DTH hammers and bits for 20 years.
Export countries---our customers from all over the world, such as France, Spain, Italy, South Africa, Iran, Malaysia, Australia ad etc.
1. SD12 Bit specification
| Drill Bit | Bit Dia.(mm) | NO.Air | Gauge | Front | Weight(Kg) | Part No. |
| Holes | Buttons | Buttons | ||||
| SD12 | 305 | 4 | 12*Φ18 | 36*Φ16 | 156 | SD12-305 |
| 311 | 4 | 12*Φ18 | 36*Φ16 | 168 | SD12-311 | |
| 330 | 4 | 16*Φ18 | 42*Φ16 | 180 | SD12-330 | |
| 356 | 4 | 16*Φ19 | 48*Φ16 | 191 | SD12-356 | |
| 381 | 4 | 16*Φ19 | 48*Φ18 | 200 | SD12-381 |
2. Bit Face Shape Selection:
1) Drop Center Bit
----For high penetration rates in soft to medium hard and fissured rock formations.
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.
3. Carbide Button Shape Selection:
1. Semi-Ballistic Buttons
2. Ballistic Button
3. Spherical Button
4. Two-step Button
4. Photos:
