The bellows coupling is a thin-walled tube (bellows) with a corrugated shape that is directly welded or bonded to the two halves of the coupling to transmit motion. This type of coupling has a simple structure, small external dimensions, easy processing and installation, and high transmission accuracy. It is mainly used in low-power precision machinery and control mechanisms that require compact structure and high transmission accuracy.

The bellows coupling consists of two hubs and a thin-walled metal tube, which are connected together by welding or bonding. Although many other materials are available, stainless steel and nickel are still commonly used metal tube materials. The nickel tube is completed by electrodeposition method. This method first involves machining a solid core rod into a corrugated shape, electroplating nickel onto the core rod, and then chemically dissolving the core rod to obtain a nickel corrugated tube.