Product info

Prime system for down the hole hammer

Robit® Prime ring bit product family makes it possible to pile both welded and threaded casing tubes using the same ring bit. Pile walls can also be made using the XL2 ring bit. With the Drill Through (DT) model, drilling can be continued with just the pilot.

• Suitable for different wall thicknesses, easy to align and weld
• Available with Flow Control rinsing
• With the Drill Through pilot bit, rock sockets can be drilled in a single work phase

Casing OD (mm)219,1
Casing OD (in.)8 ⅝
Casing Max Wall (mm)12,7
Casing Max Wall (in.)0.500
Ring bit ID (mm)172
Ring bit ID (in.)6.772
Ring bit OD (mm)241
Ring bit OD (in.)9.488
Pilot bit OD (mm)188
Pilot bit OD (in.)7.402

Compatible products

DTH Prime DT 219,1/12,7
Ring, Down the Hole Hammer, Drill Through