ND85A 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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1359mm
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175.00kg
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Φ180mm
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Cop84 DHD380
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Φ195-Φ254
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API4 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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22HZ
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15-25r/min
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12m³/min
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22m³/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. Breakout Ring
4. Check Valve
5. Spring
6. Air Distributor
7. Internal Cylinder
8. Piston
9. External Cylinder
10. Guided Sleeve
11. “o” Ring of Stop Ring
12. Stop Ring
13. Breakout Ring
14. Drive Chuck
15. Drill Bit
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34.00
0.015
0.30
1.20
0.10
6.00
6.50
42.50
60.00
5.30
0.01
1.20
0.30
17.50
40.00
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ND85A01
ND85A02
ND85A03
ND85A04
ND85A05
ND85A06
ND85A07
ND85A08
ND85A09
ND85A10
ND85A11
ND85A12
ND85A13
ND85A14
ND85A15
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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.