Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
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11 7/8" Shank DTH bit SD12 , DHD112 , NUMA120 , NUMA125 For Water Well and Foundation Drilling
| 1.General Introduction |
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
| Raw Material |
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.
NUMA120-302MM.305MM,311MM,330MM,381MM,430MM with carbides 19mm,20mm,22mm
Can be drilled well in water well drilling,Foundation drilling,piling work etc.
| Specification |
1.Steel Carbide
2.12 years experience
3.Can match to the original bit shank
4.Atlas quality
Photds
