Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
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TK18 TH18 SD18 Numa180-495mm 525mm 580mm 660mm 680mm DTH Drill Button Bits For DTH Drill rig use
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. TK28 DTH Bit specification
| Bit Shank | Bit Dia.(mm) | NO.Air | Gauge | Front | Weight(Kg) | Part No. |
| Holes | Buttons | Buttons | ||||
| TH28 | 800 | 6 | 54*Φ20 | 66*Φ20+90*Φ18 | 1363 | TH28-800 |
| 900 | 6 | 60*Φ20 | 66*Φ20+105*Φ18 | 1536 | TH28-900 | |
| 1000 | 6 | 68*Φ20 | 74*Φ20+123*Φ18 | 1804 | TH28-1000 | |
| 1100 | 6 | 76*Φ22 | 84*Φ20+140*Φ18 | 2117 | TH28-1100 | |
| 1200 | 6 | 86*Φ22 | 96*Φ20+159*Φ18 | 2300 | TH28-1200 |
2. DTh Bit Shank can be available:
1), Dia. 64mm-70mm shank Bulroc BR1
2), Dia. 70mm-95mm shank Halco MACH20, Bulroc BR2
3), Dia. 90mm-102mm shank COP32, COP34, Halco MACH303, M30, DHD3.5, Bulroc BR3
4), Dia. 105mm-152mm shank COP44, DHD340, Halco MACH44, SD4, M40, QL40, Bulroc BR4
5), Dia. 135mm-165mm shank COP54, DHD350R, COP54, Halco MACH50, SD5, M50, QL50, Bulroc BR5
6), Dia. 152mm-254mm shank COP64, DHD360, SD6, M60, QL60, Bulroc BR6
7), Dia. 203mm-330mm shank COP84, DHD380, SD8, QL80
8), Dia. 254mm-380mm shank SD10, Numa100
9), Dia. 305mm-508mm shank DHD1120, SD12, N120, N125
10), Dia. 500mm-700mm shank SD18 TH18 NUMA180
11) Dia. 600mm-800mm shank TH24 NUMA240
12) Dia. 800mm-1000mm shank TH28
3. 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.
4. Carbide Button Shape Selection:
1. Semi-Ballistic Buttons
2. Ballistic Button
3. Spherical Button
4. Two-step Button
5. Photos:
