Self-drilling Anchor Bolt

Self drilling anchor bolt system performs drilling, grouting & anchoring in one step. Easy to process and no risks of drill hole collapse. Suitable for unstable conditions.

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Product Overview

Product Category

Self-drilling anchor bolts are available in two series: R thread and T thread. The R series includes models such as R25, R28, R32, R38, R51, while the T series includes T30, T40, T52, T64, T73, T76, T103, T111, T130 and T150 models. Customers can choose different product types and models according to different engineering needs.

Composition of self-drilling anchor bolt

Self-drilling anchor bolt consists of six major accessories, a hollow anchor bar, a drill bit, a coupler, a plate, a nut, and a centralizer.

Hollow anchor bar

It combines an anchor rod with a drill pipe and has the dual function of drilling and grouting. The hollow anchor bar is made of seamless steel pipe of high tensile alloy steel, and the tensile strength and yield strength can meet various complex geological conditions according to the design requirements. Additionally, it features continuous R thread and T thread along its body for easy cutting and connection during construction.

Drill bit

The drill bit is made of wear-resistant metal, and has flush hole. The selection of the appropriate model according to the rock and soil conditions. Commonly used drill bits include hardened cross-cut drill bits, tungsten carbide cross-cut drill bits, clay bits, hardened button drill bits, and tungsten carbide button drill bits.



The coupler is a rod extension part, and it is of equal strength to the hollow anchor bar. Two rods can be connected seamlessly by the coupler, and there will be no grout leakage when grouting.



The plate is installed at the tail of the anchor bar, between the nut and the rock formation. There are two shapes: domed and flat plates. Domed plates are generally used in soil nail applications, while flat plates are used in micropile applications.



The nut is a device that has internal threads, which transmit the anchoring force of the hollow anchor bar to the plate and lock it in place. One end of the nut has a rounded surface. When there is a slight angle between the plate and the rod, it can fit with the plate to ensure proper force transmission. If the angle is large, you can choose a domed nut or add a domed washer. Cooperating with the hollow anchor bar, they provide equal strength and the effect of preventing rock mass deformation.



The centralizer is a component used to realize the centering of the hollow anchor bar in the hole, which is installed on the hollow anchor bar in front of the coupler and realize the thickness of the grouting layer not less than 20mm outside the hollow anchor bar, thus ensuring the uniform thickness of the slurry around the rod during the construction of the self-drilling anchor bolt. The anchoring effect is further enhanced.

Product Parameters

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