NN120A 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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1880mm
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475.00kg
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Φ275mm
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NUMA120
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Φ305-Φ445
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API6 5/8”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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20HZ
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15-25r/min
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28m³/min
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50m³/min
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71m³/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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70.00
0.04
0.80
2.00
0.10
16.00
25.00
113.00
170.00
25.00
0.01
4.50
0.80
48.00
164.00
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NN120A01
NN120A02
NN120A03
NN120A04
NN120A05
NN120A06
NN120A07
NN120A08
NN120A09
NN120A10
NN120A11
NN120A12
NN120A13
NN120A14
NN120A15
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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.