For small diameter holes micro piling application, the rock drill bucket is always 400mm, 500mm, 600mm, 700mm, 800mm.
120mm is the cone diameter of 7 7/8" tri-cone bit.
Features of C120 series micro piling roller cone bits
| 1 | Journal sealed bearing with TCI protection on heel of cones. |
| 2 | Cone 1/2/3 speed up rock breaking rate. |
| 3 | Shirttail hard enhanced by Tungsten Carbide. |
| 4 | C120-637 adopts 12mm conical-ball TCI. |
| 5 | C120 series suits for smaller core barrel , penetration rate is much higher. |