Home / Products / DTH Tools / NUMA125 DTH Hammer
NUMA125 DTH Hammer
NUMA series · with foot valve · hole range Φ330-400 mm
Structure · Parts list
Numbers match the sectional view above | 21 parts in total
| No. | Part | Weight | Part No. |
|---|---|---|---|
| 01 | Top Sub | 163.5kg | 01-NUMA125A-01 |
| 02 | Washer | 1.5kg | 01-NUMA125A-02 |
| 03 | O Ring | 0.03kg | 01-NUMA125A-03 |
| 04 | Check Valve | 1.5kg | 01-NUMA125A-04 |
| 05 | Spring | 0.2kg | 01-NUMA125A-05 |
| 06 | Adjuster Shim | 0.7kg | 01-NUMA125A-06 |
| 07 | Rubber Buffer | 0.3kg | 01-NUMA125A-07 |
| 08 | Rubber Buffer | 0.3kg | 01-NUMA125A-08 |
| 09 | Valve Seat | 11.8kg | 01-NUMA125A-09 |
| 10 | Rigid Valve | 27.4kg | 01-NUMA125A-10 |
| 11 | O Ring | 0.03kg | 01-NUMA125A-11 |
| 12 | O Ring | 0.03kg | 01-NUMA125A-12 |
| 13 | Piston | 137.7kg | 01-NUMA125A-13 |
| 14 | Outer Cylinder | 247.5kg | 01-NUMA125A-14 |
| 15 | Guided Sleeve | 29.7kg | 01-NUMA125A-15 |
| 16 | Check Ring | 0.2kg | 01-NUMA125A-16 |
| 17 | Stop Ring | 7kg | 01-NUMA125A-17 |
| 18 | O Ring | 0.3kg | 01-NUMA125A-18 |
| 19 | Washer | 1.5kg | 01-NUMA125A-19 |
| 20 | Drive Chuck | 67.2kg | 01-NUMA125A-20 |
| 21 | Drill Bit | — | 01-NUMA125A-21 |
Product description
The NUMA series is built for large-diameter heavy-duty work: reinforced piston and cylinder with high-flow air paths, for deep holes, hard rock and large diameters; efficiency gains are clear above 3.0 MPa.
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 Φ305 mm, hole range Φ330-400 mm, thread API6 5/8″REG, matched with NUMA125 bits; recommended working pressure 1.5–3.3 MPa, air consumption 46 / 58 m³/min. Use the upper pressure in hard rock and reduce it in wet formations to avoid regrinding 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 | NUMA125 |
| Type | with foot valve |
| Outer Ø | Φ305 mm |
| Hole Range | Φ330-400 mm |
| Length (less bit) | 1785 mm |
| Weight | 698 kg |
| Thread | API6 5/8″REG |
| Bit shank | NUMA125 |
| Air pressure | 1.5–3.3 MPa |
| Air consumption (1.0 / 1.5 MPa) | 46 / 58 m³/min |
