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Mission50 DTH Hammer
Mission series · hole range Φ136-155 mm
Structure · Parts list
Numbers match the sectional view above | 13 parts in total
| No. | Part | Weight | Part No. |
|---|---|---|---|
| 01 | Top Sub | 13.7kg | 01-Mis50-01 |
| 02 | O Ring | 0.02kg | 01--Mis50-02 |
| 03 | Check Valve | 0.7kg | 01--Mis50-03 |
| 04 | Spring | 0.1kg | 01--Mis50-04 |
| 05 | Valve Seat | 2kg | 01--Mis50-05 |
| 06 | Inner Cylinder | 2.8kg | 01--Mis50-06 |
| 07 | Piston | 15kg | 01--Mis50-07 |
| 08 | Outer Cylinder | 24kg | 01--Mis50-08 |
| 09 | Guided Sleeve | 2.6kg | 01--Mis50-09 |
| 10 | Stop Ring | 0.7kg | 01--Mis50-10 |
| 11 | O Ring | 0.01kg | 01--Mis50-11 |
| 12 | Drive Chuck | 7.1kg | 01--Mis50-12 |
| 13 | Drill Bit | — | 01--Mis50-13 |
Product description
The Mission series is compact with fewer parts and stable impact energy, suited to shallow-to-medium water wells, foundation anchoring and small mining operations, with low maintenance and spares cost.
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 Φ126 mm, matching hole Φ136-155 mm, thread API2 3/8″REG, matched with Mission50 bit; working pressure 1.0–2.5 MPa, air consumption 7 / 13 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 | Mission50 |
| Type | — |
| Outer Ø | Φ126 mm |
| Hole Range | Φ136-155 mm |
| Length (less bit) | 1122 mm |
| Weight | 70.5 kg |
| Thread | API2 3/8″REG |
| Bit shank | Mission50 |
| Air pressure | 1.0–2.5 MPa |
| Air consumption (1.0 / 1.5 MPa) | 7 / 13 m³/min |
