The main components of a sleeve coupling include an outer sleeve (or hollow tube), a shaft, a key (or a rigid connector such as a taper pin).

A sleeve coupling is a type of coupling that utilizes a common sleeve and rigid connectors such as keys, splines, or taper pins to connect two shafts. The outer sleeve (or hollow tube) is the main body of the coupling, used to connect two shafts and transmit torque. The shaft is the object connected by a coupling, fixed to the outer sleeve through rigid connectors such as keys or taper pins. These rigid connectors ensure a secure connection between the shaft and the outer sleeve, thereby achieving torque transmission.

In addition, although there may be slight differences in the description of specific components of the sleeve coupling from different sources, it is widely recognized that the outer sleeve, shaft, and rigid coupling are its core components.