Large diameter DTH , designed by Tianhe Dril for over a decade, boasts stable performance and a longservice life. lt excels in challenging terrains like karst caves, gravel layers, block stones, and slightly wea-thered bedrock, extensively used in pile foundations, water well driling and other projects.
| Hammer mode | Dth bit shank | Foot valve | Thread connection | Hammer OD(mm) | Rec. hole size(mm) | Length without bit(mm) | Piston (kg) | Hammer weight(kg) | Working pressure(bar) |
|---|---|---|---|---|---|---|---|---|---|
| 12" Hammer | |||||||||
| TK12H | DHD112 | Yes | API 6 5/8" REG | 275 | 305-380 | 1698.5 | 116.5 | 551 | 16-35 |
| TSK12H | DHD112 | No | API 6 5/8" REG | 275 | 305-380 | 1818 | 121.5 | 560 | 16-35 |
| TK12S | SD12 | Yes | API 6 5/8" REG | 275 | 305-380 | 1678.5 | 121.5 | 548 | 16-35 |
| TSK12S | SD12 | No | API 6 5/8" REG | 275 | 305-380 | 1743.5 | 121.5 | 545 | 16-35 |
| TK12N | NUMA120 | Yes | API 6 5/8" REG | 275 | 305-380 | 2015 | 120.5 | 578 | 16-35 |
| TK12HN | NUMA125 | Yes | API 6 5/8" REG | 275 | 305-380 | 1699 | 116.5 | 550 | 16-35 |
| TK12L | QL120 | Yes | API 6 5/8" REG | 275 | 305-380 | 1699 | 116.5 | 550 | 16-35 |
| 14" Hammer | |||||||||
| TK14 | TK14 | Yes | API 7 5/8" REG | 335 | 400-500 | 1954 | 198 | 894 | 16-35 |
| 18" Hammer | |||||||||
| TK18 | NUMA180 | Yes | API 7 5/8" or API 8 5/8" | 406 | 500-650 | 2162 | 329 | 1464 | 16-35 |
| 24" Hammer | |||||||||
| TK24 | TK24 | Yes | API 8 5/8" REG | 540 | 650-800 | 2270 | 680 | 2890 | 16-35 |
| 28" Hammer | |||||||||
| TK28 | TK28 | Yes | Hexagonal | 650 | 800-1150 | 2618 | 790 | 4582 | 16-35 |
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