Shenyang ABT Drilling Equipment Co., Ltd.
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N Series High Air Pressure DTH Hammers  Without Foot Valve

N Series High Air Pressure DTH Hammers Without Foot Valve

ABT produces the highest quality and efficient DTH hammer and drill bits for the mining, construction and water well industries. Drilling and blasting engineers and well contractors rely on ABT equipment because each of our product uses superior materials and advanced processes.
  • Product Description
  • Specification
    The high-pressure submerged hole impactor without nylon tube is a valveless high-pressure impactor designed by our company. It is one of the most advanced impactors in the world, and the pressure is 12-30 bar. Its main features are as follows:
1.Out of the trouble of foot valve fracture 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 span, easy and cheap maintenance.
4. The components are few, the structure is simple, and all the parts are hardened. Therefore, the working life is long, the failure is few, and the maintenance is convenient.
5, the joint box card brazing sleeve is threaded and connected with the outer cylinder, easy to disassemble.

According to the different bits of the drill, it is divided into the following series:

N Series High Air Pressure DTH Hammers  Without Foot Valve
Item Description Weight(kg)
N100A N120A N125A
1、Top Sub 59 70 70
2、“O” Ring Of Top Sub 0.03 0.04 0.04
3、Breakout Ring 0.5 0.8 0.8
4、Chenck Valve 1.4 2 2
5、Spring 0.3 0.1 0.1
6、Air Distributor 10.5 16 16
7、Internal Cylinder 12.5 25 25
8、Piston 77 113 113
9、External Cylinder 110 170 170
10、Guided Sleeve 4.5 25 23
11、“O” Ring Of Stop Ring 0.02 0.01 0.01
12、Stop Ring 1.9 4.5 4
13、Breakout Ring 0.5 0.8 0.8
14、Drive Chuck 25.5 48 45
15、Drill Bit 106 164 175
Technical Data
Length(Without Bit) N100A N120A N125A
1545mm 1880mm 1880mm
Weight(Without Bit) 305.00kg 475.00kg 470.00kg
External Diameter Ø226mm Ø275mm Ø275mm
Bit Shank NUMA100 NUMA120 NUMA125
Hole Range Ø254-Ø311mm Ø305-Ø445mm Ø305-Ø445mm
Connection Thread API4 1/2REG API5 1/2REG API5 1/2REG
API5 1”/2REG API6 5”/8REG API6 5”/8REG
Working Pressure 2.0-3.5Mpa 2.0-3.5Mpa 2.0-3.5Mpa
Impact Rate at 17 Bar 20HZ 20HZ 20HZ
Recommended Rotation Speed 15-25r/min 15-25r/min 15-25r/min
Air Consumption 1.0Mpa:22.0m³/min 1.0Mpa:28.0m³/min 1.0Mpa:28.0m³/min
1.8Mpa:40.0m³/min 1.8Mpa:50.0m³/min 1.8Mpa:50.0m³/min
2.4Mpa:65.0m³/min 2.4Mpa:71.0m³/min 2.4Mpa:71.0m³/min
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Tel:+86-13889196063
Add:No. 95-2, blacksmith Road, Hunnan District, Shenyang, Liaoning