Coupling Sleeve and Drill Bit Adapter

A coupling sleeve is used to connect the drill rod and drill rod, and drill rod and shank adapter, and has a sleeve with internal thread, which is an indispensable supporting part in rock drilling supporting drilling tools.

• Applications: open pit mining, underground mining, roadway excavation, anchoring engineering, blast furnace taphole, tunnel engineering, hydropower engineering, quarrying, and other construction projects.
• Function: The coupling sleeve adopts a special structural design to reduce the energy loss during the drilling process, thus ensuring maximum impact energy at the drill bit position.

During the drilling process, the coupling sleeve is located at the joint of the supporting drilling tool and is subject to the corrosion effects of stresses such as axial tension and compression, bending and twisting, and contact friction. Therefore, it is essential to reasonably select the steel for the coupling sleeve and optimize its geometric structure and manufacturing process.  

According to the structure, it includes a full bridge coupling sleeve and a reducing coupling sleeve.

Full bridge coupling sleeve: it is used for open-air construction, easy to dismantle, stable connection, and little risk of stuck.

Reducing coupling sleeve: Different thread at the ends to connect matchable products under specific conditions.

Coupling sleeve type:

• full bridge coupling sleeve
• reducing coupling sleeve

Thread size:

• R32
• R38
• T38
• T45
• T51

The solution to the coupling sleeve end is chipped, cracked, or flared caused by the drill rod not being firmly seated into the coupling sleeve from the mismatch of threads:

It is important to standardize on a single source supplier for components to ensure proper thread tolerance. Don’t mix to match.