ND75A 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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1258mm
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120.00kg
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Φ165mm
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Cop64 DHD360
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Φ175-Φ216
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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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23HZ
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20-30r/min
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11m³/min
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20m³/min
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28m³/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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23.00
0.015
0.70
0.10
4.50
6.50
28.00
40.00
7.50
0.01
0.80
8.00
28.50
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ND75A01
ND75A02
ND75A03
ND75A04
ND75A05
ND75A06
ND75A07
ND75A08
ND75A09
ND75A10
ND75A11
ND75A12
ND75A13
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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.