Wave springs are normally chosen when the assembly cannot spare the installed height of a conventional round-wire compression spring. Typical examples include bearing preload in compact gearboxes, clutch packs, valve modules, and small electromechanical units where every millimeter of axial space affects the housing design.
The advantage is not simply a smaller spring. A wave spring can deliver useful preload with lower installed height, which helps keep shaft position, reduce noise, or maintain contact load without making the stack taller. That is particularly valuable when the preload must be present all the time but the mechanism does not need long travel.
The engineering risk is tolerance sensitivity. Wave springs react strongly to groove depth, bearing seat flatness, washer stack-up, and contact friction. If the surrounding parts are not controlled, the delivered preload can drift far more than the nominal spring drawing suggests.
Before adopting a wave spring, the review should confirm installed height, target preload range, maximum working deflection, friction condition, and the stiffness of the surrounding components. If those inputs are known, wave springs can simplify very compact packages. If they are not, the design may look elegant on paper but become unstable in production.