Hjg Hn 120A DTH Hammer (NUMA120)

• Customization: Available
• Customized: Customized
• Standard: JIS, AISI, API
• Model NO.: NUMA 120
• Length: Jobber-length
• Type: Core Drill Bit
• Material: High Carbon Steel
• Usage: Wood Drilling, Well Drilling, Metal Drilling, Masonry Drilling
• Mining Object: Mining
• Trademark: HJG
• Origin: China
• HS Code: 84123100

Product Description

It is a kind of high air pressure DTH Hammer without footvalve, our newest design. It is also one of the most advanced DTH Hammers in the world.

It has the following advantages:
1. Out of the trouble of foot valve fracture and 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, easy and cheap maintenance.
4. Lower air and oil consumption. The oil consumption is about 10% lower than the one with foot valve.

Length(exclude bit)	Weight(exclude bit)	External Diameter	Bit Shank	Hole Range	Connection Thread
1880 mm	475.00 kg	Φ275 mm	NUMA120	Φ305mm _ Φ445mm	API 6 5/8'' Reg
Working Pressure	Impact rate at 0.5 MPa	Recommended Rotary Speed		Air Consumption
				1.0 MPa	1.8 MPa	2.4 MPa
1.0 - 2.5 MPa	20 Hz	15-25 rpm		28 m³/min	50 m³/min	71 m³/min