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SD8 DTH Hammer
SD series · hole range Φ195-254 mm
Product description
The SD series covers 4–12 inch with strong versatility and interchangeable parts — the most widely used range for water wells, geothermal and exploration; one rig covers several hole sizes by changing hammers.
A DTH hammer is a piston-type air tool: compressed air enters through the top sub, opens the check valve and is routed by the valve seat to drive the piston back and forth in the inner cylinder; the piston strikes the bit shank and the energy breaks the rock. Exhaust leaves through ports in the piston case, and flushing air carries cuttings out of the hole. The drive chuck transmits rotation, while the stop ring and guided sleeve keep the piston stroke and alignment.
Selection guide: OD Φ180 mm, matching hole Φ195-254 mm, thread API4 1/2″REG, matched with SD8 bit; working pressure 1.5–3.3 MPa, air consumption 26 / 34 m³/min. Use the upper pressure limit in hard rock; reduce pressure where water inflow is heavy to avoid re-grinding cuttings.
Suitable for water wells, bench blasting, quarries, geothermal drilling and foundation anchoring in medium-hard to hard rock. Bits, subs and packaging can be customized to drawing or sample; standard models are in stock and bulk lead times are confirmed on order.
Technical parameters
Whole-unit parameters | air consumption at 1.0 / 1.5 MPa
| Model | SD8 |
| Type | — |
| Outer Ø | Φ180 mm |
| Hole Range | Φ195-254 mm |
| Length (less bit) | 1463 mm |
| Weight | 194 kg |
| Thread | API4 1/2″REG |
| Bit shank | SD8 |
| Air pressure | 1.5–3.3 MPa |
| Air consumption (1.0 / 1.5 MPa) | 26 / 34 m³/min |
