Working Weight

6,135 lbs

2,785 kg

Recommended Carrier Weight

28 - 43 US tons

25.4 - 39 metric tons

The GH12 hydraulic hammer is compatible with excavators in the 28-43 ton range.  Visit the Attachment Wizard to see which hydraulic breakers are compatible with your carrier!




Visit and subscribe to NPK's YouTube channel for hydraulic hammer operation and service videos and videos of hydraulic breakers in action!  

Visit NPK's photo website for searchable hydraulic hammer photo galleries!

Visit the Hydraulic Hammer Publications page for sales brochures, operators manuals, and service bulletins.  If you require a service manual or would like a hard copy of any other manual, please contact the Sales Department at 440-232-7900 or email to


Visita y suscríbete al canal de YouTube de NPK para videos de instrucciones de servicio para martillos hidráulicos.

NPK offers a wide variety of accessories for hydraulic hammers:

  • Tools
  • Autolube Systems
  • Dust Suppression Kits
  • Grease
  • Quick Disconnects
  • Underwater Kits


For more about all types of hammer accessories, visit the Hammer Accessories Page.

Visit the Hammer Accessory Publications page for related 
sales brochures, operators manuals and sales bulletins.


Find a Dealer

Impact Energy Class 5,500 ft lbs
Impact Frequency 380 - 480 bpm
Oil Flow 45 - 58 gpm 170 - 220 lpm
Operating Pressure 2,650 psi 183 bar
Tool Diameter 5.7 in 146 mm
Tool Working Length 25.6 in 650 mm