NBR2A 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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880mm
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14.50kg
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Φ62mm
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BR2
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Φ70-Φ90
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RD50 Box
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Working Pressure
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Impact rate at 1.4Mpa
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Recommended rotation speed
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Air consumption
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0.7Mpa
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1.0Mpa
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1.4Mpa
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0.7-1.75Mpa
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25HZ
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25-40r/min
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2.5m³/min
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4m³/min
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5m³/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. Check Valve
3. Spring
4. Air Distributor
5. Internal Cylinder
6. Piston
7. External Cylinder
8. Guided Sleeve
9. “o” Ring of Stop Ring
10. Stop Ring
11. Drive Chuck
12. Drill Bit
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2.60
0.10
0.05
0.60
0.80
3.80
4.50
0.60
0.005
0.10
1.20
2.50
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NBR201
NBR202
NBR203
NBR204
NBR205
NBR206
NBR207
NBR208
NBR209
NBR210
NBR211
NBR212
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The Characteristics Of Middle-Low Air Pressure DTH Hammers
NBR1A, NBR2A and NBR3A series DTH Hammers are designed to operate efficiently at low air pressures and medium air pressures, using BR series bits.
The main features are as follows:
1. The operating air pressures are between 0.7Mpa and 1.75Mpa.
2. Valveless hammers.
3. Simple structure, easy to assemble and to disassemble, long life.
4. Higher impact frequency and faster drilling speed.
5. Lower air consumption and lower oil consumption. A hole can be drilled on the check valve to provide more efficient cuttings discharge.
6. Especially suitable for quarrying.
Explanation of Middle-Low Air Pressure DTH Hammer code
For example: NBR2A
N-New Diamond
BR2-BR2 Bit Shank
A- The structure of the hammer is similar to other valveless hammers without foot valve manufactured by our company.