Hjg HD475A DTH Hammer (HD475)

• Customization: Available
• Customized: Customized
• Standard: JIS, AISI, API
• Model NO.: HD475
• Length: Stub-length
• Type: Gun Drill Bit
• Material: Tungsten Carbide
• Usage: Wood Drilling, Well Drilling, Metal Drilling, Masonry Drilling
• Mining Object: Mining
• Trademark: HJG
• Origin: China
• HS Code: 84123100

Product Description

Based on the characteristics of the wells, oil, gas and construction drilling, our company self-designed, developed and manufactured this kind of high air pressure DTH hammer.

It has the following characteristics:
1. Using the latest rock drilling theory, optimizing the inside structure and the size of the air distribution, to make the DTH Hammer obtain the optimal energy transfer and make it achieve faster drilling speed and lower air consumption.
2. For such projects as the drill bit break, retrieving very difficult, we specially designed a safe and reliable anti-shedding device for the bit.
3. The check valve can be replaced to the one with bigger ail controlling hole to provide more efficient cuttings discharge.
4. The top sub and the drive chuck have special thread, which can achieve an easier disassemble.

Length(exclude bit)	Weight(exclude bit)	External Diameter	Bit Shank	Hole Range	Connection Thread
4080 mm	2775.00 kg	Φ475 mm	HD475	Φ508mm _ Φ760mm	API 8 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		56 m³/min	75 m³/min	85 m³/min