The self-drilling bolt is a hollow grouted bolt that integrates drilling, grouting, and anchoring functions. It consists of a hollow bolt body, nut, washer, coupler, centering device and drill bit, which is suitable for fractured or difficult-to-drill surrounding rock.

Self-drilling bolts can be used for slope support, foundation pit support, pile foundation support, tunnel pipe roof support, system support, as well as foundation support for transmission towers or wind towers, and the restoration of old buildings.

The hot-dip galvanized self-drilling bolts produced by our company have an average zinc coating thickness of over 80μm, suitable for various acidic and alkaline corrosive environments, as well as the stratum and groundwater contain sulfides and chlorides or seawater erosion. The service life exceeds 50 years.