A rock anchor consists of a tendon and an anchorage. The tendon can consist of one or more solid steel bars, a single hollow bar, or a bundle of several high tensile steel strands. The tendon always features a bond length, and often features a free stressing length, over which a debonding mechanism or process ensures that the tendon is free to elongate without obstruction during tensioning. Drilling, grouting and tension testing are the three principal components of any rock anchor construction project. In the case of post-tensioned rock anchors, every installation is at least proof-tested by applying tension equal to 133% of the rock anchor's design loading.

Sinorock is dedicated to being the most reliable self drilling bolt supplier of the best quality products. We strive to exceed our customers' requirements and expectations in every possible way. 

Because of the excellent thickness seamless steel tube, the convenient and rapid thread forming process on surface and the perfect fittings, self drilling bolt can make the unify of drilling grouting and anchoring come true.