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

NM 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

Main Features of NM Series High Air Pressure DTH Hammers Without Foot Valve

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.

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:

Specification of NM Series High Air Pressure DTH Hammers Without Foot Valve

NM Series High Air Pressure DTH Hammers Without Foot Valve
Item Description Weight(kg)
1、Top Sub 6.5 13.7 20 34
2、“O” Ring Of Top Sub 0.1 0.015 0.015 0.015
3、Breakout Ring - - - 0.3
4、Chenck Valve 0.35 0.7 0.7 1.2
5、Spring 0.05 0.1 0.1 0.1
6、Air Distributor 1.5 2 3.5 6
7、Internal Cylinder 2.1 2.8 4.2 6.5
8、Piston 8.5 15 23 42.5
9、External Cylinder 14.8 24 26 61
10、Guided Sleeve 1.8 2.6 4.8 5.3
11、“O” Ring Of Stop Ring 0.005 0.01 0.01 0.01
12、Stop Ring 0.3 0.7 0.8 1.5
13、Breakout Ring - - - 0.3
14、Drive Chuck 3.8 6.5 4.2 17.3
15、Drill Bit 6.6 13.5 23 31
Technical Data
Length(Without Bit) NM4A NM5A NM6A NM8A
1005mm 1110mm 1161mm 1338mm
Weight(Without Bit) 40.00kg 68.50kg 90.00kg 176.00kg
External Diameter Ø99mm Ø126mm Ø142mm Ø144mm Ø180/Ø185mm
Ø146mm Ø148mm
Bit Shank NM4 NM5 NM6 NM8
Hole Range Ø110-Ø135mm Ø155-Ø190mm Ø155-Ø203mm Ø195-Ø254mm
Connection Thread API2 3”/8REG API2 3”/8REG API3 1”/2REG API4 1”/2REG
API3 1”/2REG API2 7”/8REG
API2 7”/8REG 2 7”/8 IF
Working Pressure 1.2-2.0Mpa 1.3-2.3Mpa 1.5-2.5Mpa 1.5-3.0Mpa
Impact Rate at 17 Bar 30HZ 28HZ 25HZ 22HZ
Recommended Rotation Speed 25-40r/min 20-35r/min 20-30r/min 15-25r/min
Air Consumption 1.0Mpa:5.0m³/min 1.0Mpa:7.0m³/min 1.0Mpa:9.0m³/min 1.0Mpa:12.0m³/min
1.8Mpa:9.0m³/min 1.8Mpa:14.0m³/min 1.8Mpa:18.0m³/min 1.8Mpa:22.0m³/min
2.4Mpa:14.0m³/min 2.4Mpa:19.0m³/min 2.4Mpa:26.0m³/min 2.4Mpa:28.0m³/min
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Add:No. 95-2, blacksmith Road, Hunnan District, Shenyang, Liaoning