ND1120A 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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474.00kg
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Φ275mm
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DHD1120
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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
173.00
24.00
0.01
4.00
0.80
46.00
140.00
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ND1120A01
ND1120A02
ND1120A03
ND1120A04
ND1120A05
ND1120A06
ND1120A07
ND1120A08
ND1120A09
ND1120A10
ND1120A11
ND1120A12
ND1120A13
ND1120A14
ND1120A15
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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.