DICTIONARY OF AUTOMOTIVE TERMS - "Na"

N:

A gear selection indication for neutral

NAAMSA:

Acronym for "National Association of Automobile Manufacturers of South Africa"

NACA duct:

This is an air opening which was named after the National Advisory Committee for Aerodynamics. It was the American organization which developed the kinds of designs for low drag air ducts for jet engines. NACA ducts are used on cars to force air for engine breathing and cooling, for forcing air through the radiators, and for providing fresh air for the passenger compartment.

Nacelle:

A plastic or metal covering. A headlight nacelle on a motorcycle is the bucket surrounding the headlight.

NADA:

Acronym for "National Automobile Dealers Association"

NAFTA:

Acronym for "North American Free Trade Agreement"
on http://strategis.ic.gc.ca/SSG/am00635e.html.

N.A.G.:

A vehicle brand of which these models, with required application, are classic cars.

NAICS:

Acronym for "North American Industrial Classification System."

Nail hammer:

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

Nail punch:

See drift punch

Naked bike:

A motorcycle without any type of fairing

Name:

See model name

Nameplate:

See import nameplate

NAPA:

Acronym for "National Automotive Parts Association"

NASCAR:

Acronym for "National Association for Stock Car Auto Racing" or "North America Stock Car Auto Racing" or

Nash:

A vehicle brand of which the 1930 Twin Ignition 8; 1931 Series 900; 1932 Series 990, Advanced 8, and Ambassador 8 with required application are classic cars. The 1951-54 Healey models are milestone cars.
Also See:
Frazer Nash.
Click image for books on Nash

National coarse thread:

(NC) A standard for the threads of nuts and bolts in which the number of threads per inch is much fewer than a fine (NF) nut or bolt. Observe the difference in the number of threads per inch (TPI) of the NF and NC in the following chart. Also called unified National Coarse thread

WIDTH	NF TPI	NC TPI
#10	32	24
#12	28	24
1/4	28	20
5/16	24	18
3/8	24	16
7/16	20	14
1/2	20	13
9/16	18	12
5/8	18	11
3/4	16	10
7/8	14	9
1	14	8
1-1/8	12	7
1-1/4	12	6
1-3/8	12	6
1-1/2	12	5
1-3/4	n/a	4
2	n/a	4.5
2-1/4	n/a	4.5
2-1/2	n/a	4
2-3/4	n/a	4
3	n/a	4

National fine thread:

(NF) A standard for the threads of nuts and bolts in which the number of threads per inch is much greater than a coarse (NC) nut or bolt. Also called unified National Fine thread. Observe the difference in the number of threads per inch (TPI) of the NF and NC in the following chart

WIDTH	NF TPI	NC TPI
#10	32	24
#12	28	24
1/4	28	20
5/16	24	18
3/8	24	16
7/16	20	14
1/2	20	13
9/16	18	12
5/8	18	11
3/4	16	10
7/8	14	9
1	14	8
1-1/8	12	7
1-1/4	12	6
1-3/8	12	6
1-1/2	12	5
1-3/4	n/a	4
2	n/a	4.5
2-1/4	n/a	4.5
2-1/2	n/a	4
2-3/4	n/a	4
3	n/a	4

National flag:

The flag flown by a ship to show her nationality.

National Highway Traffic Safety Administration:

(NHTSA) A US regulatory body which determines the regulations for vehicles.

Natural convection:

1. Movement of a fluid caused only by temperature differences (density changes).
2. Circulation of a gas or liquid due to difference in density resulting from temperature differences.

Natural frequency:

The frequency at which an object, circuit, or system oscillates or vibrates when set in free vibration. Large heavy objects have low natural frequencies and small light objects have high natural frequencies.

Natural gas:

An alternative, environmentally friendly fuel (mainly methane) which can be stored under pressure in the trunk as compressed natural gas (CNG).
Also See:
compressed natural gas
liquified natural gas

Naturally aspirated engine:

A conventional engine that takes in air at normal pressure, i.e. not turbocharged or supercharged. The opposite is forced-induction engine

Natural oxide film:

A transparent film which forms naturally on an aluminum surface due to oxidation

Natural oxide skin:

A transparent film which forms naturally on an aluminum surface due to oxidation

Natural rubber:

(NR) An elastomer produced from latex, a milky sap, obtained from the rubber tree (Hevea brasiliensis) and other plants. An elastic and porous form of rubber.
Also See:
synthetic rubber

Natural weathering:

A corrosion test by means of which the corrosion resistance of a material is tested in the open air

Nave:

A wheel hub

Nave plate:

A hub cap

Navigating bridge:

The command post of a ship.

Navigator:

See electronic navigator

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