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SP681 (ND65A)

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SP681 (ND65A)
DTH Hammer

This Series high air pressure DTH hammer work without foot-valve is designed and developed by our own, which is the one of the most leading DTH hammer in the world.
  • Avoid the problem happens on foot valve, fracture, expansion and contraction.
  • Lower air comsumption and higher impact frequency. 15-30% higher drilling efficiency than the bit with foot valve.
  • Simpler structure and less spare parts, makes easier and cheaper maintenance.
  • Heat-hardended spare parts, makes longer serving life and less problem.
  • Thread connection for top sub and drive chuck, make easier disassembly.
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SP681 (ND65A) Structure

Ref.PartsWeightPart NoRef.PartsWeightPart No.
01Top Sub21.5 Kg01-5P681-0109Piston Case36.5 kg01-5P681-09
02“0”Ring0.01 Kg01-SP681-0210Guided Sleeve6.3 kg01-SP681-10
03Disc Spring0.34 Kg01-SP681-0311Check Ring0.02 kg01-SP681-11
04Check Valve0.56 Kg01-SP681-0412Retainer Ring1kg01-SP681-12
05Spring0.05 Kg01-SP681-0513“O”Ring0.01 Kg01-5P681-13
06Valye Seat4.3 Kg01-SP681-0614Drive Chuck8.2 kg01-SP681-14
07Inner Cylinder4.2 Kg01-SP681-0715Drill Bit 01-SP681-15
08Piston23 Kg01-SP681-08    

Technical Parameter

Length(Less bit)WeightOuter DiameterConnection ThreadBit ShankHole Range
1210mm106Kgφ148mmAPI3 1/2″REGND65Aφ158-φ203mm
Work PressureRecommended Rotation SpeedAir Consumption
1.8Mpa2.4Mpa
1.2-2.5 Mpa30-60 r/min16m³/min23m³/min
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info@rockdrillmaster.com
sales@rockdrillmaster.com

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Mobile : +86 188 2419 8826

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Pingjiang Industrial Park, Yueyang,
Hunan Province, China