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Halfshaft

A rotating shaft, normally one of two, that transmits power from the differential to a driven wheel.

Halide

Any compound of halogen with another element such as refrigerant.

Halide Leak Detector

A device consisting of a tank of acetylene gas, a stove, a chimney, and a search hose used to detect CFC refrigerant leaks by visual means.

Hall Effect

The development of a voltage across a semiconductor carrying a current when the semiconductor is in a magnetic field that is at right angles to the current flow.

Hall- Effect Sensor

A type of electromagnetic sensor used in electronic ignition systems and other sensing circuits. Named for Edwin H. Hall, who discovered the Hall effect.

Hall-effect Switch

A device that produces a voltage pulse dependent on the presence of a magnetic field. Hall-effect voltage varies as magnetic reactance varies around a current-carrying semiconductor.

Halogen

Refers to any of five chemical elements-astatine (At), bromine (Br), chlorine (Cl), fluorine (F), and iodine (I)- that may be found in some refrigerants.

Halogen Lamp

A high-output, white-light lamp used as a headlight. Also known as halogen light.

Halogen Leak Detector

An electronic device used to detect leaks in a refrigerant system.

Halogen Light

A high-output, white-light lamp used as a headlight. Also known as halogen lamp.

Halogens

Refers to any of five nonmetallic and electronegative chemical elements.

Hammer Forming

To form or shape metal by hitting it with a hammer over, on, or into a base form.

Hand Shield

A hand-held protective device that has a filter plate and is used in arc welding, arc cutting, and thermal spraying for shielding the eyes, face and neck.

Hand Tight

To assemble plain or threaded parts as much as can be done by hand, without the aid of a wrench or tool.

Hand Tools Institute (HTI)

A trade association that represents automotive hand-tool and tool-box manufacturers.

Hand Valve

A valve mounted on the steering column or dash, used by the driver to apply trailer brakes independently of the tractor brakes.

Handicap

A system that allows two cars from different classes in a drag race to compete with each other.

Handler

1. A driver who is able to get the most out of his or her car. 2. A car that the driver can get the most out of.

Handling

A vehicle's ability to turn and to keep traveling in the intended direction over rough roads. Improving a vehicle's handling means it can now take corners at a higher speed, for example. Products that improve handling include wheel and tire packages, springs, shocks and anti-sway bars. See also ride quality.

Hands-free Cell-phone Accessories

Accessories that allow a driver to speak on a cellular phone without holding the phone. This may include a headset or a speaker for the phone, which often is part of a mounting/charging device that plugs into a cigarette lighter or other 12-volt outlet.