The main application of the FRICTION BOLT 240 kN –  expandable friction bolt is temporary rock reinforcement in Mining and Tunneling. Bonding forces between the friction bolt and the rock mass are caused by form closure and friction transfer between the borehole wall and the rock bolt which is expanded by hydraulic pressure.

  • The FRICTION BOLT  is an expandable rock bolt with excellent elongation properties designed to accommodate ground movement.
  • The FRICTION BOLT is a folded steel tube with a welded ferrule on each end.
  • The FRICTION BOLT lt is safe and easy to install.
  • The FRICTION BOLT  is inserted into the drilled hole and inflated using high pressure water.
  • The FRICTION BOLT is inflated to the exact shape of the drilled hole and can tolerate a large variation in hole diameter.
  • Characteristic Value / Type 240 kN

  • External diameter original tube [mm]  54
  • Elongation A5min. 10 %
  • Wall thickness [mm] 2
  • Optimum borehole diameter [mm]  45 – 51
  • Inflation pressure [bar]  300
  • Plate 180x180x8 mm domed type
  • High-Pressure Pump ( pneumatic or electric )