Gold Member Since 2013
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Changsha Heijingang Industrial Co., Ltd.

Dth Hammer, Rock Drilling, Down The Hole Hammer manufacturer / supplier in China, offering Hjg HD225A DTH Hammer (NUMA100), Hjg Wells Geothermal Drilling Rig, Hjg Reverse Circulation Drill Bit and so on.

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Hjg HD225A DTH Hammer (NUMA100)

FOB Price: Get Latest Price
Min. Order: 1 Piece
Port: Shanghai, China
Payment Terms: L/C, T/T

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Basic Info
  • Model NO.: NUMA100
  • Certification: BIN, JIS
  • Type: Core Drill Bit
  • Usage: Wood Drilling, Well Drilling, Metal Drilling
  • Trademark: HJG
  • HS Code: 84123100
  • Customized: Customized
  • Length: Jobber-length
  • Material: Tungsten Carbide
  • Mining Object: Mining
  • Origin: China
Product Description
Hjg HD225A DTH Hammer (NUMA100)

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 DiameterBit ShankHole RangeConnection Thread
1745 mm315.00 kg Φ225 mm  NUMA100Φ254mm _ Φ311mmAPI 4 1/2'' Reg
API 6 5/8'' Reg
Working PressureImpact rate at 0.5 MPaRecommended Rotary SpeedAir Consumption
1.0 MPa1.8 MPa2.4 MPa
1.0 - 2.5 MPa20 Hz15-25 rpm22 m³/min 40 m³/min65 m³/min
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Mr. Larry Wu
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