Nail Hammer - A hammer designed to hit the head of nails and usually has a claw device which allows for the removal of nails.

NanoMeter - A unit of spatial measurement that is 10 to the -9th meter, or one-billionth of a meter.

Nanotechnology - The science and technology of building devices, such as electronic circuits, from single atoms and molecules.

Natural Frequency - The frequency of free vibration of a system.

Naturally Aspirated - An engine that draws air in without the assistance of a supercharger or turbocharger.

Naval Brass - A brass made with 60% copper 40% zinc with 1% tin added for extra corrosion resistance.

NCAP - The U.S. government “crash testing” program.

NEC - National Electric Code

Necking - Reduction of the cross-sectional area of a material in a localized area caused by uniaxial tension.

Needle Nose Pliers - Pliers with half round and tapered jaws. Also known as Long Nose Pliers.

Needle Roller Bearing - A special bearing which has a small OD when compared to its ID.

NEMA - National Electrical Manufacturers Association,  U.S. association that establishes specifications and ratings for electrical
components and apparatuses. Conformance by manufacturers is voluntary.

Net Indicated Mean Effective Pressure - The ratio of net work per cycle to cylinder volume displaced per cycle.

Neutral Flame - A gas flame in which the oxygen and acetylene volumes are balanced and both gases are completely burned.

Neutral Plane - Plane through a beam where compression and tension stresses are zero.

New Car Assessment Program - The U.S. government “crash testing” program.

Newton Metre - The SI unit of Torque.

NIC - Network interface card

Nickel Silver - Copper nickel zinc alloy.

NIMEP - The ratio of net work per cycle to cylinder volume displaced per cycle.

Nimonic - An alloy consisting of roughly 80% nickel and 20% chromium with additives such as titanium and aluminium.

Nitrating - A case hardening process in which ammonia or some other form of nitrogen is introduced to the surface of certain
alloys.

Nitrification - The biological oxidation of ammonia and ammonium sequentially to nitrite and then nitrate.

Nitrous Oxide - Also known as laughing gas, an anaesthetic.

Nitrogenous oxygen demand - The amount of oxygen required to oxidize ammonia present in a water

Nm - Newton metre, the SI unit of Torque.

NOD - Nitrogenous oxygen demand

Node - A point or line on a vibrating structure that remains stationary.

Nonferrous - Metals which contain no iron. Aluminum, brass, bronze, copper, lead, nickel, and titanium are nonferrous.

Normal Stress - Stress acting perpendicular to an imaginary plane cutting through an object.

Normalizing - Heating a ferrous alloy to a suitable temperature above the transformation range and then cooling in air to a
temperature substantially below the transformation range.

NPDES - National Pollutant Discharge Elimination System,  A permit program that controls water pollution by regulating point
sources (such as pipes or man-made ditches) that discharge pollutants into waters of the United States.

NPT - National Pipe Thread, the taper pipe thread standard used in North America.

NTSC - the color television standard established by the National Television Standards Committee in the United States in 1953.
Nucleate Boiling - Boiling in which bubble formation is at the liquid-solid interface rather than from external or mechanical
devices; occurs in kettle-type and natural-circulation heaters or reboilers.

Number Drills - This system of numbering drills is no longer used, but may be of use in deciphering old drawings.

Nut - A type of hardware fastener with a threaded hole.

NVH - Commonly used abbreviation for Noise, Vibration and Harshness

Nylon Hammer - A soft face hammer with a nylon face.
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