Middle-Low Hammer

Product Name: NBR Middle-Low Air Pressure DTH Hammers
Product model: NBR1A, NBR2A, NBR3A

Details Of Middle-Low Hammer

The NBR1A, NBR2A and NBR3A downhole impactors are medium to low pressure impactors that can be matched to BR series drills.

 Features Of Middle-Low Hammer:

1. Adapt to the working wind pressure of 0.7-1.75Mpa.
2. valveless hammer.
3. Simple structure, easy disassembly and long life.
4. High impact power and fast drilling speed
5. Low air consumption and low energy consumption. When it is necessary to increase the slag discharge, the hole can be drilled in the check valve.


Specification Of NBR Series DTH Hammer
Item Description Weight(kg)
1、Top Sub 1.7 2.6 5.2
2、“O” Type Ring 0.1 0.1 0.1
3、Chenck Valve 0.1 0.1 0.1
4、Spring 0.05 0.05 0.2
5、Air Distributor 0.8 0.6 0.8
6、Internal Cylinder 0.8 0.8 1.3
7、Piston 1.2 3.8 5.5
8、External Cylinder 4 4.5 9.5
9、Guided Sleeve 0.15 0.6 1
10、“O” Ring Of Stop Ring 0.005 0.005 0.05
11、Stop Ring 0.1 0.1 0.15
12、Drive Chuck 0.8 1.2 2
13、Drill Bit 1.7 2.5 4
Technical Data
Length(Without Bit) NBR1A NBR2A NBR3A
760mm 880mm 889mm
Weight(Without Bit) 10.00kg 14.50kg 26.00kg
External Diameter Ø54mm Ø62mm Ø82mm
Bit Shank BR1 BR2 BR2
Hole Range Ø64-Ø76mm Ø70-Ø90mm Ø90-Ø110mm
Connection Thread Br40,BOX Rd50,BOX API2 3”/8REG
Working Pressure 1.0-1.5Mpa 1.0-1.5Mpa 1.0-1.5Mpa
Impact Rate at 14 Bar 27HZ 25HZ 25HZ
Recommended Rotation Speed 25-40r/min 25-40r/min 25-40r/min
Air Consumption 0.7Mpa:1.5m³/min 0.7Mpa:2.5m³/min 0.7Mpa:4.0m³/min
1.0Mpa:2.5m³/min 1.0Mpa:4.0m³/min 1.0Mpa:6.0m³/min
1.4Mpa:3.0m³/min 1.4Mpa:5.0m³/min 1.4Mpa:8.0m³/min



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