ND65A DTH Hammer Technical Data
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Length (Less bit)
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Weight (Less bit)
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External diameter
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Bit Shank
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Hole Range
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Connection Thread
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1238mm
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98.00kg
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Φ142mm
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Cop64 DHD360
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Φ155-Φ203
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API3 1/2”Reg
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Working Pressure
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Impact rate at 1.7Mpa
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Recommended rotation speed
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Air consumption
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1.0Mpa
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1.8Mpa
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2.4Mpa
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1.0-2.5Mpa
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25HZ
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20-30r/min
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9m³/min
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18m³/min
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26m³/min
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Item Description
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Weight (kg)
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Part Number
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1. Top Sub
2. “O” Ring of Top Sub
3. Check Valve
4. Spring
5. Air Distributor
6. Internal Cylinder
7. Piston
8. External Cylinder
9. Guided Sleeve
10. “o” Ring of Stop Ring
11. Stop Ring
12. Drive Chuck
13. Drill Bit
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20.00
0.02
0.70
0.10
3.50
4.20
23.00
31.50
6.50
0.01
0.60
6.00
26.00
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ND65A01
ND65A02
ND65A03
ND65A04
ND65A05
ND65A06
ND65A07
ND65A08
ND65A09
ND65A10
ND65A11
ND65A12
ND65A13
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It has the following advantages:
1. Out of the trouble of foot valve fracture and expansion and contraction.
2. Lower energy consumption and higher impact frequency. The drilling speed is 15%-30% higher than the one with foot valve.
3. Simple structure, reliable parts, long life, easy and cheap maintenance.
4. Lower air and oil consumption. The oil consumption is about 10% lower than the one with foot valve.