The main feature of the Self-Drilling Anchor (SDA) system is the application of a single-use drill bit in combination with the rock bolt being used as a drill steel. Thus, the rock bolt is connected to the hydraulic rock drill by an adapter device and installed in the way a conventional borehole is drilled. SDA program consists of the following:
Hollow bars, with a continuous outside thread
Single-use drill bits, which are available either hardened or with carbide inserts
Steel couplings, with a continuous inside thread
Steel nuts Steel face plates etc
