Product info

Robit® Overburden Eccentric System

  • Designed to offer maximum reliability in overburden drilling conditions
  • Enables driving the casing in all downward vertical directions/formations
  • Helps avoid collapsing holes and lost equipment
  • A two-piece bit, consisting of a concentric pilot bit and a swing-out eccentric reamer
  • Enlarges the hole’s diameter driving the casing down into the hole
  • Reamer can be retractred by applying reverse rotation
  • Full system can be pulled out and used again
  • Ideal for water well and geothermal drilling, micropiling, as well as dam and port projects
Casing OD (mm)139,7
Casing OD (in.)5 ½
Casing Max Wall (mm)5,6
Casing Max Wall (in.)0.220
Casing ID (mm)128,5
Casing ID (in.)5.059
Pilot bit (mm)125,5
Pilot bit (in.)4.941
Reamed diam. (mm)153,0
Reamed diam. (in.)6.023
Drill pipes (mm)76 / 89
Drill pipes (in.)3 / 3½