ND275A 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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2626mm
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650.00kg
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Φ275mm
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Numa125
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Φ305-Φ445
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API 65/8”Reg API 75/8”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. Retainer
16. Drill Bit
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230.00
0.04
1.00
2.00
0.50
16.00
25.00
113.00
170.00
23.00
0.03
4.00
1.00
34.00
30.00
185.00
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ND275A01
ND275A02
ND275A03
ND275A04
ND275A05
ND275A06
ND275A07
ND275A08
ND275A09
ND275A10
ND275A11
ND275A12
ND275A13
ND275A14
ND275A15
ND275A16
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Based on the characteristics of the wells, oil, gas and construction drilling, our company self-designed, developed and manufactured this kind of high air pressure DTH hammer.
It has the following characteristics:
1. Using the latest rock drilling theory, optimizing the inside structure and the size of the air distribution, to make the DTH Hammer obtain the optimal energy transfer and make it achieve faster drilling speed and lower air consumption.
2. For such projects as the drill bit break, retrieving very difficult, we specially designed a safe and reliable anti-shedding device for the bit.
3. The check valve can be replaced to the one with bigger ail controlling hole to provide more efficient cuttings discharge.
4. The top sub and the drive chuck have special thread, which can achieve an easier disassemble.