In automotive suspension, a control arm, also known as an A-arm, is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel.

The inboard (chassis) end of a control arm is attached by a single pivot, usually a rubber bushing. It can thus control the position of the outboard end in only a single degree of freedom, maintaining the radial distance from the inboard mount. Although not deliberately free to move.

A link stabilizer, otherwise known as a sway bar, anti-roll bar or even stabilizer link, connects the vehicles left and right wheels through short links, reducing body roll whilst cornering, and absorbing shocks from potholes and uneven road surfaces. Fitting a strong, durable part is therefore a must. With an enlarged ball bin made from surface-hardened steel, a top-grade rubber boot and a high-performance grease, link stabilizers deliver a safe and comfortable ride, time and time again.

A bushing or rubber bushing is a type of vibration isolator. It provides an interface between two parts, damping the energy transmitted through the bushing. A common application is in vehicle suspension systems, where a bushing made of rubber (or, more often, synthetic rubber or polyurethane) separates the faces of two metal objects while allowing a certain amount of movement. A rubber bushing may also be described as a flexible mounting or antivibration mounting.

In an automobile, ball joints are spherical bearings that connect the control arms to the steering knuckles, and are used on virtually every automobile made. They bionically resemble the ball-and-socket joints found in most tetrapod animals.

A ball joint consists of a bearing stud and socket enclosed in a casing; all these parts are made of steel. The bearing stud is tapered and threaded, and fits into a tapered hole in the steering knuckle. A protective encasing prevents dirt from getting into the joint assembly.