Automotive Glossary

Automotive Glossary

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Part of a wheel: connects the rim to wheel hub.


The way in which you get around a program or website.


Neutral Drive Switch.

Needle Bearing

A bearing made from small diameter rollers in between inner and outer bearing tracks.

Needle Valve

(1) Valve by which fluid flow rate is controlled by the degree of insertion of a tapered needle into a fixed diameter orifice. This type of valve can provide a fine gradation of flow. (2) Valve in which a blunt, conically ended needle seats on a fixed diameter orifice. With this type of valve there is little or no gradation of flow, control being limited to full, with needle lifted, or none, with needle seated.

Negative Camber

Steering geometry where the road wheel leans inward at the top.

Negative Castor

Angle in side elevation between the steering and vertical axis. Steering axis hits the ground behind the vertical axis.

Negative Communication

A comment or statement expressing lack of approval.

Negative Offset (Wheel)

The position of the wheel nave or disc when inside the centre line of the wheel.

Negative Scrub

Negative scrub radius steering geometry where a line through the steering swivel axis meets the road surface outside of the tyre centre line.

Negative Temperature Coeffcient

See Negative Temperature Coefficient.

Negative Temperature Coefficient

Type of resistor that has resistance reducing with increases in temperature. These resistors are used in electrical circuits to give temperature sensing and control. Thermistor.

Negative Temperature Coeficient

See Negative Temperature Coefficient.


Interlinked group of computers so that resources can be shared.

Network Card

A piece of hardware that allows computers to be connected to a network.


Gearbox position when no gear is selected and no drive transmitted.

Neutral Drive Switch

On a transmission system, a switch that makes when neutral is selected.

Neutral Steer

Steering condition when the vehicle follows a true line in relation to the steered wheels.


One of a number of particles in the nucleus of an atom. The neutron has no polarity and is electrically neutral.

New and like-new finishes

Finishes that have maintained a brilliant, high-gloss performance.

Newton (N)

A standard unit of force.


Nickel di-hydroxide


Nickel metal hydride – used in alkaline batteries.


Nickel hydroxide

Nip (Bearing)

The amount by which shell bearing halves are clamped in order to secure them in their housing.


Newton Metres

Non Independent

Describes suspension systems using a solid beam axle where the movement of one wheel affects the other wheel on the same axle.


Describes metals which contain no iron.


Used to describe paint finishes that do not contain metallic pigments, i.e. Solid colours


Prevents flow or holds back a liquid.

Non-Return Valve

A valve that will allow fluid or gas to pass in one direction only.


Any form of communication that does not use words, i.e. traffic lights, shaking somebody's hand and smiling.

Normally Aspirated

Non pressure-charged engine using atmospheric pressure and cylinder vacuum to charge the cylinders.

North Pole

The term used to describe one of the poles of a magnet where the magnetic field lines of force start.


Oxides of nitrogen. An exhaust emission pollutant.


The tip of an injector from where the fuel is sprayed.


Nominated Tester – a person nominated by an AE to carry out tests, Inspectors appointed by Designated Councils to carry out tests, all of which are approved by VOSA. Also VOSA staff appointed under section 66A of the Road Traffic Act 1988.

NTC Resistor

Type of resistor that has resistance reducing with increases in temperature. Used for temperature sensors.


The mass of neutrons and protons at the centre of an atom.


Non-volatile Random Access Memory

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