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
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.
Engineering Glossary, Engineering Dictionary N
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