Tapered Drill Rod

Tapered Drill Rod is a type of drill rod widely used in rock drilling, mining, tunnel construction, mountain crushing and other fields. It is often used in conjunction with pneumatic drills, handheld rock drills, small hydraulic drills, etc. It occupies an important position in small and medium-sized drilling projects due to its simple structure, convenient connection and low cost.

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Tapered Drill Rod refers to a drill rod with one or both ends processed into a tapered structure. The drill bit is usually firmly connected to the drill rod through a taper (such as 7 degrees, 11 degrees, 12 degrees). This connection method does not require threads, but instead taps the drill bit to wedge into the tapered end to achieve a firm connection.

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Drill rod body

Material: generally high-quality alloy steel (such as 55SiMnMo, 40Cr), with high strength and wear resistance after heat treatment.

Diameter: Common specifications are 22mm (H22) and 25mm (H25).

Tapered end

The front end is processed into a cone to match the rock drill bit.

Common tapers: 7°, 11°, 12°

Tail end

Usually hexagonal or round, used to insert the rock drill chuck (Shank Adapter) to achieve power transmission.

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Easy connection
No need for threads or special joints, high efficiency in replacing drill bits on site.

Strong anti-seismic performance
Tapered connection is more suitable for bearing impact force and torque, especially for pneumatic rock drilling.

Low cost of use
Low manufacturing and maintenance costs, suitable for small mines or dispersed working surfaces.

Strong adaptability
Can be used interchangeably with drill bits of different lengths and types to meet different rock working conditions.

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Mining (especially small metal and non-metal mines)

Tunneling

Road slope reinforcement

Building demolition

Stone mining (such as granite, limestone)

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Check the wear of the tapered part regularly
Excessive wear will lead to unstable connection and affect the working efficiency.

 

After the drill bit and the drill rod are tightly matched, they should be properly tapped to fix
Ensure a firm connection to avoid falling off during operation.

 

Use a special drill puller or drill puller caliper
When replacing the drill bit, use the correct tool to prevent damage to the tapered end.

 

Avoid twisting or strong impact on the middle section of the drill rod
Otherwise, it is easy to cause bending or breaking, affecting accuracy and life.

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