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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
Hammer4"
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Casing ODCasing ODCasing Max WallCasing Max WallCasing IDCasing IDPilot bitPilot bitReamed diam.Reamed diam.Drill pipesDrill pipesHammer
Order codemmin.mmin.mmin.mmin.mmin.mmin.
DTH-REC 114.3-5114,34 ½6,00.236102,34.02799,53.917125,04.9217633"
DTH-REC 168.3-6168,36 ⅝5,60.220157,16.185154,06.063185,07.283893½5"
DTH-REC 193.7-6193,77 ⅝5,00.196183,77.232179,07.047212,08.3461144½6"
DTH-REC 219.1-6.3219,18 ⅝6,30.248206,58.129203,07.992238,09.3701144½6"
DTH-REC 273-6.3273,010 ¾6,30.248260,410.251255,010.039307,012.086139 / 1685½ / 6½8"
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