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A better design that combines efficiency, reliability and serviceability.

  • Excellent power-to-weight ratio
  • Unique gas-charged piston maximizes hammer efficiency
  • Simple, two-moving-parts design for reliability
  • Separate ports for the NPK AutoLube system and an air line for underwater use
  • Bottom tie rod nuts for easier serviceability (GH Models)
  • Quick-change tool system with single round retainer pin
  • Variety of tool configurations available
  • Replaceable cylinder sleeves for easy, economical rebuild
  • Tool bushings engineered for quick, easy replacement

Vibration control that increases operator comfort to increase efficiency. Standard on all medium and large NPK hammers, our shock-absorbing mounting bracket uses special heavy-duty rubber mounts to absorb shock, recoil, and impulse vibration. Their unique one-piece design eliminates the need for mechanical springs and overly heavy mounting brackets. The net result is that you minimize machine wear and improve operator comfort for greater reliability and productivity.

Simplified lubrication for greater reliability. A grease port is provided for automatic and / or manual greasing of the demolition tool. This prevents damage or premature wear caused by a lack of grease.

Full serviceability of the industry's easiest, lowest cost, body-rebuild system. Hammers aren't meant to have an easy life. They occasionally need to be rebuilt. When the hammer body is involved, NPK's replaceable sleeve design can reduce your costs by a factor of five to ten.


Model Year
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Carrier Weight: 11 - 15.5 US tons
Operating Weight
2,150 lbs. (980 kg)
Tool Diameter
4.2 in. (106 mm)
Tool Length
20 in. (500 mm)


500 - 800 bpm


Hydraulic Flow
Oil Flow: 24 - 40 gpm (90 - 150 lpm)
Operating Pressure
2,400 psi (165 bar)


Energy per Strike
2,000 ft. lbs.

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*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.