Application of DTH (Down the Hole) Hammers:
A DTH hammer drives its piston right at the bit, down inside the hole, instead of transmitting impact energy down a long drill string from surface — keeping the blow full-strength no matter how deep the hole gets. The range covers everything from small water-well and blast holes up to ultra-large-diameter foundation work.
Features of DTH Hammers
– Full size range from 3″ to 40″.
– Bit shank compatibility across Global, Sandvik, and Numa standards (DHD, SD, N series).
– Connection types from API 3⅛″ up to hex joint on the largest sizes.
– Recommended hole diameters engineered per hammer size for optimal penetration.
Specification of DTH Hammers (selected sizes)
| Hammer Size | Hole Dia. Range | Hammer Dia. (mm) | Weight, Less Bit (kg) | Connection |
| 3″ | 82–102mm | 76 | 28 | API 3⅛″ |
| 5″ | 130–146mm | 116 | 62 | API 3½″ |
| 8″ | 190–253mm | 180 | 200 | API 4½″ |
| 12″ | 300–445mm | 275 | 650 | API 6⅝″ |
| 18″ | 460–650mm | 410 | 1,560 | API 8⅝″ |
| 24″ | 610–850mm | 520 | 2,450 | API 8⅝″ |
| 32″ | 760–1170mm | 700 | 4,610 | Hex Joint |
| 40″ | 960–1520mm | 900 | 6,950 | Hex Joint |
Note: Full spec sheet covers all 17 sizes from 3″ to 40″ — confirm target hole diameter and bit shank standard before ordering.