Hex19 / Hex22 / Hex25 * 108mm / 159mm shank Integral Chisel Bit Drill Rods for Mining and Tunneling

Integral Head Chisel Bit Drill Steel Rods — also known as integral drill rods — are indispensable rock drilling tools in modern mining, tunneling projects, and infrastructure construction. Unlike traditional modular drilling assemblies, these tools integrate the drill rod and the bit into a single unit ; thanks to their exceptional energy transmission efficiency and durability, they hold a prominent position in the field of hard rock drilling.

Core Design and Process Features

Integral Forging : Crafted from high-quality alloy steel (such as 40SiMoCrNiMo or 55SiMnMo) through a single, integral forging process. This design completely eliminates the potential for energy loss or fracture at threaded connections, thereby ensuring highly efficient energy transmission.

Carbide Insert : The drill bit section typically features high-performance tungsten carbide inserts, configured in a "chisel-type" design. This cutting head boasts exceptional hardness and wear resistance, enabling it to effortlessly cut through rock formations.

Precision Heat Treatment : Through precise quenching and tempering processes, the rod body is endowed with superior fatigue resistance, effectively preventing deformation or brittle fracture under high-frequency impact loads.

Technical Specifications

Shank Size : Common sizes include Hex 19mm, Hex 22mm, and Hex 25mm ; lengths typically measure 82.5 mm, 108 mm, or 159 mm.

Head Diameter : Typically ranges from 23 mm to 45 mm, suitable for drilling small-diameter blast holes.

Effective Length : Covers an extremely wide range, from 400 mm to 9600 mm.

Applications

These drill rods are primarily designed for use with air-leg or handheld rock drills.

Their typical application scenarios include : 

Mining and Quarrying : Drilling blast holes in granite and marble mines, as well as for rock splitting operations.

Tunneling and Water Diversion Projects : Conducting excavation drilling and rock bolting in confined spaces.

Transportation and Municipal Construction : Performing rock-breaking operations for road cutting, foundation drilling, and municipal pipeline excavation.

Performance Advantages

High Efficiency : Energy loss is minimized, resulting in drilling speeds that are faster than those of traditional threaded tools.

Cost-Effectiveness : Frequent bit replacement is eliminated, thereby reducing the cost per borehole.

Reliability : The simple structure minimizes downtime caused by stuck bits resulting from bit detachment or thread damage.