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Hang A Left

To make a left turn.

Hang A Right

To make a right turn.

Hang It Out

To deliberately throw the rear end into a slide during a turn.

Hang On Unit

An under-dash, aftermarket air conditioner. May also refer to other under-dash devices, such as a CB radio.

Hangover

Undesired speaker-cone oscillation caused by a transient signal.

HAP

Hazardous Air Pollutant.

Hard Chrome

A heavy-chrome plating applied to metal to increase its durability and resistance to wear.

Hard Copy

A printed copy of machine output in readable form, such as reports, listings, or graphic images.

Hard Edge

A sharp corner where two surfaces meet.

Hard Face

The application of a hard material, such as chrome, to a surface to increase its durability and wear resistance.

Hard Parts

The internal engine parts required to rebuild an engine.

Hard Pedal

1. A loss in braking efficiency so that an excessive amount of pressure is needed to actuate brakes. 2. A condition whereby the load literally overrides the brakes.

Hard Solder

Any solder requiring more than 1000 degrees F (538 degrees C) to melt.

Hard Spots

Areas in the friction surface of a brake drum or rotor that have become harder than the surrounding metal.

Hard Throttle

A term used when the accelerator is pressed to the floor.

Hard Tonneau Cover

A tonneau cover that is rigid. Most hard tonneau covers are made of fiberglass, and they typically come painted with automotive basecoat/clearcoat paint to match a truck. However, there also are hard tonneau covers made from diamond plate aluminum, steel, plastic and Masonite. Some designs don’t interfere with tailgate access, while others can be locked over the tailgate to secure possessions in the bed. Most hard tonneaus feature a hinged mounting system that allows the cover to be lifted from the rear. However, there are other designs, including covers with a hinge in the center that open from either side, butterfly-style, and covers that can be opened in various sections. To make opening and closing the cover easier, most tonneau covers feature gas struts.

Hardener

A chemical component of an epoxy resin that starts a catalytic reaction and causes the mixture to harden.

Hardness Test

The technique used to determine the hardness of a material.

Hardtop

A two- or four-door hardtop convertible body type with front and rear seats, generally characterized by the lack of door or "B" pillars.

Hardtop

A term used with vintage vehicles (and some newer models) to describe a 2- or 4-door car that does not have a pillar, or post, between the driver's (or passenger's) side window and the quarter window. The same vehicle with a pillar would be called a sedan. The term hardtop also is used to describe a vehicle with a fixed roof, as opposed to a convertible.