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Spring Hanger

The vehicle-frame bracket for the eye at the front of the rear leaf spring.

Spring Leaf

A long, flat section of spring steel making up all or part of a leaf spring.

Spring Leaf Insert

Small, replaceable composition pads placed between the spring leaves near the ends to aid in slippage between the leaves while they are flexing.

Spring Load

A measure, in pounds or kilograms, of how much weight a spring can support, generally at the installed height.

Spring Oscillation

Continued compression and rebound motion of a spring, after the wheel has encountered a bump or hole on the road surface, which diminishes gradually, depending on the condition of the shock.

Spring Pin

A small piece of metal rolled in a pin-like manner that is used to dowel small parts that may occasionally have to be disassembled and reassembled.

Spring Rate

The relationship of spring deflection to lead applied, such as the amount of weight, in pounds per inch or newtons per millimeter, required to deflect the rear spring.

Spring Retainer

The element which locates and provides reaction for the spring in a one-way roller clutch.

Spring Sag

The loss of spring load due to overloading and/or metal fatigue.

Spring Seat

The recess in a chassis where a coil spring is mounted.

Spring Shackle

A small, swing-arm attachment at the rear of the leaf spring to allow the spring to flex.

Spring Torque Windup

A term used for a Hotchkiss drive.

Spring Walk

The tendency of a valve spring to bounce around in its seat at high-engine speed.

Spring Windup

The slight S-shape assumed by the leaf spring during extreme acceleration and braking that may be controlled by traction bars on high-performance vehicles.

Springy Thingy

A dragster that has a light, flexible structure to allow for maximum weight transfer.

Sprint Car

A single-seat, front-engine car designed for short oval tracks.

Sprint Race

A short race of a few laps on an oval track.

Sprocket

A sheet-like disk with teeth around its outer perimeter that mesh with a belt or chain.

Sprocket Pitch

The dimension between the centers where the rollers would be bedded against the bottoms of adjacent tooth spaces.

Sprocket-pitch Diameter

The pitch diameter of a sprocket used in a synchronous belt drive that coincides with the belt pitch line and is always greater than the sprocket outside diameter.