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)273
Casing OD (in.)10¾
Casing Max Wall (mm)12,7
Casing Max Wall (in.)0.500
Ring bit ID (mm)222
Ring bit ID (in.)8.740
Ring bit OD (mm)304
Ring bit OD (in.)11.969
Pilot bit OD (mm)245
Pilot bit OD (in.)9.646

Compatible products

DTH Prime 273/12,7
Ring, Down the Hole Hammer