DR-DHD340 DTH Hammer
DHD340 shank · API 2 3/8 REG · 108–130 mm holes
The DR-DHD340 DTH hammer uses a DHD340 bit shank and an API 2 3/8 REG pin connection. Its 99 mm body is specified for 108–130 mm holes and an 8–30 bar working-pressure range.
Technical specifications
| Parameter | Specification |
|---|---|
| Model | DR-DHD340 |
| Bit shank | DHD340 |
| Top sub thread | API 2 3/8 REG pin |
| Length without bit | 881 mm |
| Outside diameter | 99 mm |
| Net weight | 38 kg |
| Recommended hole size | 108–130 mm |
| Working pressure | 8–30 bar |
| Impact frequency at 18 bar | 31 Hz |
| Air consumption at 10 bar | 5 m³/min |
| Air consumption at 18 bar | 10.2 m³/min |
| Air consumption at 24 bar | 15 m³/min |
DHD340 numbered component view
The numbered view identifies all 13 hammer components, including the top sub, piston, internal cylinder, outer tube, sealing rings and drive sub.
The DR-DHD340 DTH hammer delivers compressed-air percussion through a DHD340-shank drill bit. Its body has a 99 mm outside diameter, an 881 mm length without the bit and a net weight of 38 kg.
DR-DHD340 DTH hammer connections
The API 2 3/8 REG pin top sub connects the hammer to the drill string. The drive end accepts a DHD340-shank bit for recommended hole sizes of 108–130 mm. The upper thread and lower bit shank are separate interfaces. Browse our drilling tools and accessories.
Compressed-air operation
The working-pressure range is 8–30 bar, with an impact frequency of 31 Hz at 18 bar. Air consumption is 5 m³/min at 10 bar, 10.2 m³/min at 18 bar and 15 m³/min at 24 bar. Explore our air compressors and the technical explanation of down-the-hole drilling and compressed-air percussion.
Numbered components
| No. | Component |
|---|---|
| 1 | Top sub |
| 2 | O-ring |
| 3 | Check-valve dart |
| 4 | Spring |
| 5 | Steel washer |
| 6 | Rigid valve |
| 7 | O-ring |
| 8 | Internal cylinder |
| 9 | Piston |
| 10 | Outer tube |
| 11 | Bit-retainer ring |
| 12 | O-ring |
| 13 | Drive sub |