NN125A 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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470.00kg
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Φ275mm
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NUMA125
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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
23.00
0.01
4.00
0.80
45.00
175.00
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NN125A01
NN125A02
NN125A03
NN125A04
NN125A05
NN125A06
NN125A07
NN125A08
NN125A09
NN125A10
NN125A11
NN125A12
NN125A13
NN125A14
NN125A15
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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.