Strut

[2] Part of the functionality of the clavicle is to serve as a strut between the scapula and sternum, resisting forces that would otherwise bring the upper limb close to the thorax.

Frequently struts are found in roof framing from either a tie beam or a king post to a principal rafter.

Struts provide outwards-facing support in their lengthwise direction, which can be used to keep two other components separate, performing the opposite function of a tie.

Bracing struts and wires of many kinds were extensively used in early aircraft to stiffen and strengthen, and sometimes even to form, the main functional airframe.

Lift struts came into increasing use during the changeover period and remain in use on smaller aircraft today where ultimate performance is not an issue.

Struts have also been widely used for purely structural reasons to attach engines, landing gear and other loads.

MacPherson struts are often purchased by the automakers in sets of four completed sub-assemblies: These can be mounted on the car bodies as part of the manufacturers' own assembly operations.

For such struts, the bearing is the wear item, as it is subject to constant impact of vibration and its condition reflects both wheel alignment and steering response.

The MacPherson strut system does not require an upper control arm, bushings, or a pivot shaft like previous models.

To check if a set of struts is failing; simply walk to each side of the wheel and begin to bounce the car up and down.