DICTIONARY OF AUTOMOTIVE TERMS - "Ha"


H:
  1. A letter rating for tires to indicate that they are theoretically rated for speeds up to 210 kph (130 mph), as in P185HR13. The next higher rating is V and the one lower rating is T.
  2. Système International (SI) symbol for henry
Habits:
See:
driving habits
Hacksaw:

Hacksaw Handsaw for cutting metal, with a narrow blade attached to a frame

HAI:
Acronym for heated air inlet system
Hair:
See:
helmet hair
Hairline crack:
A tiny stress crack which forms due to strains in the material or extreme temperature differences; as opposed to crazing, a single crack of this type will often occur alone
Hair pin:

Hair Pin A roadway with several sharp turns usually on an hill.

Hair pin cotter:

Hair Pin Cotter A securing device shaped somewhat like a "U" in which the legs have a series of waves or bends. Insert one leg into the hole of a rod so that the "bent" leg will encircle the rod.
Also See:
hitch pin clip where one leg is straight

Hairpin valve spring:
A valve spring formed from a wire or metal strip bent to form two levers emanating from a half-loop or coil; used on some classic cars and motorcycles
Half:
See:
crankcase half
Half link:

half link Every chain has rollers which are connected by side plates or keepers. When counting the number of links in a length of chain, it is easiest to count the number of side plates on one side of the chain and multiplying the number by two. When a chain needs to be an odd number, a half link is included. The term "half link" is a misnomer. It should be called a single link. The side plate on a half link is not flat but has a step down shape. For this reason, it is called an "offset link."

Half moon key:
See:
half-moon key.
Half-moon key:

woodruff key A driving key serving the same purpose as the regular key but it is shaped somewhat like a half circle. Also called a "woodruff key."

Half-moon slip joint pliers:
A multiple-slip joint pliers with groove joint
Half-round body file:
A body file with domed file surface for working reverse-crowned panels
Half-round file:
A special file that's flat on one side and convex on the other
Half shaft:
A rotating shaft that transmits power from the final drive unit to one side of the drive wheels, but usually refers to the two shafts that connect the road wheels to the final drive with independent rear suspension or front-wheel drive as opposed to the axle shafts of a live rear axle. Also called an axleshaft
Half step gearing:
See:
half-step gearing.
Half-step gearing:
A gearing system of a bicycle in which a shift between chainrings in a double chainring set is equivalent to half a gear step on the freewheel.
Halftrack:

Halftrack Vehicle with caterpillar tracks over the rear wheels to provide motive power but steered by normal front wheels

Half wave rectifier:
See:
rectifier.
Half-wave rectifier:
See:
rectifier.
Halide refrigerants:
Family of refrigerants containing halogen chemicals.
Halide torch:
Type of torch used to safely detect halogen refrigerant leaks in system.
Hall effect:
In electrical conductors where electric current flows perpendicular to a magnetic field, a so-called Hall voltage is produced perpendicular to the direction of current flow and to the magnetic field
Hall-effect ignition system:
Transistorized ignition with Hall generator
Hall-effect sensor:
A hall generator
Hall-effect switch:
A hall vane switch
Hall element:
A pulse generator that makes use of the Hall effect and consists of a rotor with vanes, a conductive element with a permanent magnet and the Hall IC. Also called "Hall generator." When the air gap is unobstructed, a Hall voltage is generated; when a vane stands in the air gap, the magnetic flux cannot reach the Hall IC. Hall generators used as ignition pulse generators have as many vanes and Hall windows as the engine has cylinders, dwell being determined by the width of the vanes. Hall generators used in electronic-map ignition systems to provide the engine starting signal have only one Hall window
Hall generator:
A pulse generator that makes use of the Hall effect and consists of a rotor with vanes, a conductive element with a permanent magnet and the Hall IC. Also called "Hall element."
Also See:
transistorized ignition with Hall generator
Hall IC:
A solid state device with the actual Hall generator and integrated circuits for voltage amplification and potential reversal, producing the pulses for the control unit
Hall module:
A Hall IC
Hall sensor:
A hall generator.
Also See:
transistorized coil ignition with Hall sensor
Hall vane switch:
A "switch" that makes use of the Hall effect. When the air gap is free, a magnetic field acts on the Hall IC and the Hall voltage reaches its maximum (high). When a rotor vane obstructs the air gap, shielding the Hall IC from the magnetic flux, the Hall voltage reaches its minimum (low). The signal produced is a square wave
Hall voltage:
See:
hall effect
Halogen:
One of the chemical elements fluorine, chlorine, bromine, iodine, or astatine.
Also See:
quartz halogen bulb
Halogen bulb:
A bulb containing a trace of a halogen, such as iodine. A halogen bulb gives off a brighter light.
Also See:
quartz halogen bulb
Halogen headlamps:
Tungsten-halogen bulb used in sealed beam unit or as separate bulb in composite headlamp
Halogen headlight:
High intensity reflector with inner halogen bulb, precision lens, and 3-prong attachment. Don't touch the glass of a halogen bulb with your fingers. The oil left on the glass will cause the glass to break or reduce the life of the bulb. If the glass is accidentally touched, it may be cleaned with methylated spirits or rubbing alcohol on a soft cloth
Halogens:
Substance containing fluorine, chlorine, bromine, and iodine.
Hamlin switch:
A suspended-mass-type sensor used in new air bag systems; avoids the ecological problems associated with the earlier mercury-type switches
Hammer:
  1. To hit with a hammer.
  2. To ride hard and fast.
  3. Someone who rides hard and fast.
  4. Trucker slang for the accelerator pedal as in "When we get past this parking lot we can really hit the hammer."
  5. A hand tool with a head (usually metal) and a handle. It is used to force one item against or through another. Several types of hammers are available
    Also See:
    air hammer
    ball peen hammer
    ballpein hammer
    ball pien hammer
    blacksmith hammer
    body hammer
    brass hammer
    bricklayer hammer
    bumping hammer
    caulking hammer
    chipping hammer
    claw hammer
    club hammer
    copper-faced hammer
    deadblow hammer
    demolition hammer
    drilling hammer
    drywall hammer
    fender bumping hammer
    finish hammer
    framing hammer
    grooving hammer
    machinists' hammer
    nail hammer
    nylon hammer
    panel hammer
    peen hammer
    pein hammer
    pick and finishing hammer
    pick hammer
    planishing hammer
    prospector's pick
    ripping hammer
    riveting hammer
    rotary hammer
    rubber mallet
    shingler's hammer
    shingler's hammer
    shrinking hammer
    sledge hammer
    slide hammer
    soft face hammer
    tack hammer
    tile setter hammer
    tinner's hammer
    tinner's hammer
    two-way hammer
    welding hammer
    wide-nose peen hammer
    wing bumping hammer
    wood mallet.
Hammer down:
Trucker slang for driving fast as in "We got a southbound smokey with the hammer down."
Hammer drill:
Electric hand drill that hammers as well as rotates
Hammerform:
A shaped wooden block used in panel beating, on which a desired form is produced by hammering
Hammer welding:
Metalworking technique that includes gas welding, preferably without the use of filler rod, followed by hammer and dolly work on the welded joint to smooth out any remaining imperfections
Hamper:
See:
height hamper pitch control
Hamper pitch:
See:
height hamper pitch control
Hamper pitch control:
See:
height hamper pitch control
Hand:
See:
left hand gear lever
left hand monkey wrench
left hand thread
right hand thread
right hand turn signal
third hand
Handbook:
A manual which gives instructions or information.
Also See:
owner's handbook
owner's manual
Handbrake:
A brake operated by a hand lever. It may also refer to the parking brake.
Handbrake turn:
180° turn achieved by applying the handbrake (acting on the rear wheels) hard when the vehicle is starting to turn
Handbrake warning light:
A light on the instrument panel that illuminates when the handbrake is applied; on most new cars it has been superseded by a multifunction brake warning light
Hand controls:
An auxiliary set of components to allow disabled people to operate a vehicle.
Handcrafted:
Something that is built by hand rather than in an assembly line (i.e., mass produced).
Hand crank:
Before Cadillac invented and first produced electric starters, engines were started by means of a handle which was inserted into the front of the engine and rotated manually. After 1930 it became obsolete.
Hand cycle:

Hand Cycle A human powered cycle that is propelled by rotating the crank with your hands rather than your feet. Usually there is one wheel up front and two (often smaller) in the back. It is designed for people who are unable to use their legs.

Hand drill:

Hand drill A power-driven device for boring holes or (with the correct attachment) removing or securing screws and bolts

Handed:
Something that is made for a specific side of a unit. For example, left hand arm rests are not interchangeable with right hand arm rests.
Also See:
left handed monkey wrench
Handed monkey:
See:
left handed monkey wrench
Handed monkey wrench:
See:
left handed monkey wrench
Hand file:
A flat file for shaping metal, with a rectangular cross section, constant blade width and one smooth edge
Hand gear:
See:
left hand gear lever
Hand gear lever:
See:
left hand gear lever
Hand lapped valves:
A process of grinding valves by hand so that there is a perfect match between the valve and its seat.
Handle:
  1. The reaction of a vehicle under a particular circumstance, especially regarding cornering, roadholding, and maneuvring.
  2. To deal with or to cope with (e.g., "the tires can handle 50 psi" means the tires can withstand pressure up to 50 psi).
  3. A CB user's code name.

Also See:
boot handle
door handle
drive handle
file handle
flexible drive handle
grab handle
offset handle
pull-out door handle
ratchet handle
spinner handle
starting handle
trunk handle
Handlebar:
A steering device found on bicycles and motorcycles. Grips, brake levers, and shifters, etc. are attached to the handlebar.
Handlebar bag:

Handlebar Bag A container, usually leather and nylon, which mounts on the front of a bicycle's handlebars.

Handlebar riser:
A bracket which lifts the base of the handlebar up higher.
Handling:
The relative ability of a vehicle to negotiate curves and respond to road conditions. It is a factor of the weight of the vehicle, the suspension, tires, air flow, etc.
Also See:
neutral handling
performance handling system
Handling system:
See:
performance handling system
Hand monkey:
See:
left hand monkey wrench
Hand monkey wrench:
See:
left hand monkey wrench
Hands:
See:
glad hands
Hands-free:
A car cell phone that allows the driver to dial and talk on the phone without handling the phone.
Handshaker:
A colloquial term for a passenger car with a manual transmission
Hand shield:
An eye and face protector held in the hand. It enables a person to look directly at the electric arc through a special lens without being harmed.
Hand thread:
See:
left hand thread
right hand thread
Hand turn:
See:
right hand turn signal
Hand turn signal:
See:
right hand turn signal
Hanger:
  1. A flexible ring or strap to hold a pipe, e.g., an exhaust pipe.
  2. A mounting bracket, e.g., a spring hanger for a leaf spring.
  3. A component of sighting point gauges, used to install the gauge at the vehicle chassis.
  4. Device attached to walls or other structure for support of pipe lines.

Also See:
dropout hanger
Hangover:
A modification of custom cars with separate chassis, e.g., pick-ups, which raises the floorpan and lowers the body, to give the impression that the body has been pulled down over the chassis right down to street level
Hard aground:
A ship which has gone aground and is not able to move under her own power.
Hard anodic coating:
Hard, wear-resistant, oxide layer produced in an anodic oxidation process
Hard anodizing:
A special type of anodizing adapted to the production of thick, hard, abrasion-resistant films
Hardboard:
A board-like building material made of compressed wood chip fibres and sawdust
Hard chromium plating:
An electrolytic deposition of a hard, wear-resistant, chromium layer
Hard code:
A type of trouble code that causes the ECU to disengage the ABS and not re-engage it until the problem is repaired
Hard-dry:
The condition of paint when it is hard enough to polish
Harden:
  1. The action of turning from a liquid to a solid.
  2. To set or to cure.
  3. The action of making the surface a metal tougher.
    Also See:
    case harden.
Hardened:
See:
case-hardened
chrome-hardened
Hardened pushrods:
Specially treated pushrods designed for use with pushrod-guided rocker arms
Hardener:
Chemical added to plastic filler to induce hardening as used in auto body repair.
Hardening:
The process of paint, epoxy, or glue becoming hard. The drying or hardening of paint film goes through several stages. The first stage is called "dust-free"; at this stage, the paint has hardened sufficiently to prevent dust from becoming embedded in the paint film. The second stage is called "touch-dry"; at this point, the paint film can actually be touched with light finger pressure. The third and final stage is referred to as "hard-dry"; at this point, the paint film is hard enough to polish.
Also See:
age-hardening
Hardness:
The toughness of the surface of a metal.
Also See:
abrasion hardness
brinell hardness
indentation hardness
rockwell hardness
shore hardness
Hard pedal:
A loss in braking efficiency so that an excessive amount of pressure is need to actuate brakes
Hard rubber:
See:
ebonite
Hard-sided caravan:
A British term for a trailer with foldable, hard wall panels
Hard-sided trailer:
A trailer with foldable, hard wall panels
Hard solder:
Uniting two pieces of metal with a material having a melting point higher than "soft" solder: e.g., silver soldering
Hard spots:
Shiny bluish/brown glazed areas on a brake drum or disc friction surface, caused by extreme heat. Excessive heat has changed their molecular structure. Hard spots can usually be removed by resurfacing
Hard stop:
Hard braking, but not necessarily with locked wheels
Hardtail:
A term for a bike (motorcycle or bicycle) which has no rear suspension
Hardtop:

Hardtop A two-door or four-door vehicle without a center door post, i.e., no B-post. It gives the impression of uninterrupted glass along the side of the car. The term is derived from "hardtop convertible." Other generic names have included sports coupe, hardtop coupe, or pillarless coupe. In the face of proposed rollover standards, nearly all automakers turned away from the pillarless design to a pillared version by 1976-77.
Also See:
colonnade Hardtop
formal Hardtop
four-door Hardtop
four-door Pillared Hardtop
two-door hardtop

Hardtop convertible:
An automobile with a fixed roof that does not retract into the trunk, but gives the appearance of being a convertible
Hardtop stand:
A foldable stand that holds a detached hardtop in a vertical position when stored
Hard-top trailer:

Hard-top Trailer A holiday trailer with a hard top and (most often) canvas sides.

Hard trim:
Instrument panel moldings, center consoles and similar plastic trim
Hardy disc:
A disc-style flexible coupling
Hardy-Spicer joint:
A type of universal joint commonly used with prop shafts
Hardy-Spicer universal joint:
A type of universal joint commonly used with prop shafts
Harm:
See:
bodily harm
Harmful:
See:
ecologically harmful
Harmonic balancer:
Also called vibration damper. It usually is a solid crankshaft fan belt pulley that has a weight ring bonded by rubber to the inner crankshaft-mounted ring. The outer ring absorbs and cancels out crankshaft vibrations that otherwise might cause the crankshaft to break. Formerly, two gearwheels carrying an unbalanced weight, mounted in bearings below the middle main crankshaft bearing, driven at twice engine speed and rotating in opposite directions to counterbalance the secondary vibrations in a four-cylinder reciprocating engine.
Also See:
crankshaft pulley
damper
Harness:
  1. A belt system used with child seats and in cars, consisting of two shoulder belts and two lap belt portions fastened by a central buckle.
  2. A bundle of electrical wires. For convenience in handling and for neatness, all wires going to certain part of the vehicle are bundled together into a harness. A wiring harness.

Also See:
4-point racing harness
brinell hardness
safety harness
wiring harness
Harness ties:
Self-tightening nylon straps used to bundle wires into harnesses. Once tightened, they can't be removed unless they are cut
Harness wrap:
One of several materials used to bundle wires into manageable harnesses:
Also See:
loom
split loom
loom tape
harness ties
Harvey wallbanger:
Trucker slang for a reckless driver as in "That 4-wheeler is a real harvey wallbanger."
Hat:
The portion of a detachable brake disc that comes in contact with the wheel hub
Hatch:
  1. The rear opening of a vehicle which allows passage into its cab.
  2. A hatchback.
  3. A tailgate.
  4. An opening in a deck through which cargo and stores are loaded or unloaded.

Also See:
cross-hatch
cross hatch
hot hatch
Hatchback:

Hatchback A car design in which the rear trunk and lid are replaced by a rear hatch that includes the backlight (i.e., rear window). Usually the rear seat folds down to accommodate more luggage. Originally a hatch was a small opening in the deck of a sailing ship. The term "hatch" was later applied to airplane doors and to passenger cars with rear liftgates. Various models appeared in the early 1950s, but weather-tightness was a problem. The concept emerged again in the early 1970s, when fuel economy factors began to signal the trend toward compact cars. Technology had remedied the sealing difficulties. By the 1980s, most manufacturers produced one or more hatchback models, though the question of whether to call them "two-door" or "three-door" never was resolved. Their main common feature was the lack of a separate trunk. "Liftback" coupes may have had a different rear-end shape, but the two terms often described essentially the same vehicle.
Also See:
five-door hatchback
four-door hatchback
liftback station wagon

Hatchback coupe:

Hatchback Coupe Originally a small opening in the deck of a sailing ship, the term "hatch" was later applied to airplane doors and to passenger cars with rear liftgates. Various models appeared in the early 1950s, but weather-tightness was a problem. The concept emerged again in the early 1970s, when fuel economy factors began to signal the trend toward compact cars. Technology had remedied the sealing difficulties. By the 1980s, most manufacturers produced one or more hatchback models, though the question of whether to call them "two-door" or "three-door" never was resolved. Their main common feature was the lack of a separate trunk. "Liftback" coupes may have had a different rear-end shape, but the two terms often described essentially the same vehicle.
Also See:
three-door hatchback coupe
two-door hatchback coupe

Hatch battens:
Flat bars which are wedged against hatch coamings to secure tarpaulin
Hatch beam:
Portable beam across a hatch to support hatch covers
Hatch coaming:
The vertical plating bounding a hatch for the purpose of stiffening the edges of the opening and resisting water entry
Hatchway:
An opening in a deck through which cargo and stores are loaded or unloaded
Hat section:
See:
top hat section
Haul:
See:
long-haul
Hawse pipe:
Tube through which anchor chain is led overboard from the windlass on the deck
Hawser:
Strong rope or steel cable used for securing or mooring ships
Hazard:
See:
road hazard
Hazard flasher switch:
A switch (usually located on the steering column below the steering wheel) which makes all the signal lights flash simultaneously, to warn other vehicles that your car is disabled or going very slowly down the road. Also called "4-way warning light switch."
Hazardous wastes:
Automotive wastes that are on the EPA's list of hazardous materials or that have one or more hazardous characteristics
Hazard warning flasher:
Actuates warning system of flashing front and rear turn signal lamps
Hazard warning switch:
A switch (usually located on the steering column below the steering wheel) which makes all the signal lights flash simultaneously, to warn other vehicles that your car is disabled or going very slowly down the road. Also called "4-way warning light switch."



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