QL40 DTH Mining Drill Bit Hammer 4 Inch 99mm with 10-25 Bar Working Pressure for Blasting Operations
- Bit Diameter: 4 inch (99mm outer diameter)
- Working Pressure: 10-25 bar (1.2-2.0 MPa)
- Weight: 40.7 kg
- Recommended Hole Range: 115-130mm
- Connection Thread: API 2 3/8 REG
- Matched Hammer: QL40 Shank
KINGDRILLING DTH hammers are engineered for high-performance rock drilling applications. Available in sizes from 2" to 33" with compatible drill bits from 2" to 48", these hammers feature multiple face designs and various tungsten carbide button styles to optimize performance across diverse drilling conditions and rock formations.
| Model | OD (mm) | Hole Range (mm) | Length (mm) | Connection Thread | Working Pressure (MPa) | Air Consumption | Weight (Kg) |
|---|---|---|---|---|---|---|---|
| MH40Q | 99 | 110-135 | 1070 | API2-3/8"REG | 1.2-2.0 | 1.0MPa-5m³/min 1.8MPa-9m³/min 2.4MPa-14m³/min |
40 |
| MH50Q | 125 | 135-155 | 1090 | API2-3/8"REG/API2-7/8"IF/API3-1/2"REG | 1.3-2.3 | 1.0MPa-7m³/min 1.8MPa-14m³/min 2.4MPa-19m³/min |
67 |
| MH60Q | 146 | 155-203 | 1183 | API3-1/2"REG | 1.5-2.5 | 1.0MPa-9m³/min 1.8MPa-18m³/min 2.4MPa-26m³/min |
92 |
| MH80Q | 180 | 195-254 | 1330 | API4-1/2"REG | 1.5-3.0 | 1.0MPa-12m³/min 1.8MPa-22m³/min 2.4MPa-28m³/min |
171 |
Specify: Shank Type + Top Sub Thread + (With/Without Valve, if this parameter is optional)
Top hammer drills are primarily used in mining, construction and quarrying of rock material. Top hammer drilling, combined with the "drill and blast" method, makes the whole excavation process extremely efficient.
In top hammer drilling, the activity is concentrated at the top of the drill string, above the hole, as a hammer transmits cyclical shock waves to the drill bit by applying a percussive force on the drill rods or tubes (With DTH drills, the hammer is placed down-the-hole at the bit).
A down-the-hole drill, usually called DTH by most professionals, is basically a jackhammer screwed on the bottom of a drill string. The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or drilling mud).
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