NM5A 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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1110mm
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68.50kg
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Φ125mm
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HM5
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Φ135-Φ155
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API2 3/8”Reg 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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28HZ
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20-35r/min
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7m³/min
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14m³/min
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19m³/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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13.70
0.015
0.70
0.10
2.00
2.80
15.00
24.00
2.60
0.01
0.70
6.50
13.50
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NM5A01
NM5A02
NM5A03
NM5A04
NM5A05
NM5A06
NM5A07
NM5A08
NM5A09
NM5A10
NM5A11
NM5A12
NM5A13
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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.