A coupling sleeve is a sleeve-shaped component utilized in the field of mechanical engineering; in 2013, it was officially recognized and included as a standardized term within the discipline of mechanical engineering. This component features an internal thread structure and is primarily employed to connect a shank adapter to a drill rod, or one drill rod to another, thereby serving as a critical connecting assembly.
The structural characteristics and functional attributes of the coupling sleeve are explicitly defined in the first edition of *Mechanical Engineering Terminology: Volume 5*.
As a specialized technical term for tool connection components, its definition was formally promulgated and implemented in 2013, following a rigorous review by the National Committee for Terms in Sciences and Technologies.