DICTIONARY

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- N -


NAS Drawings & -
Documents issued by the National Aerospace Standards committee to create and maintain industry standards.
Necking -
Reducing the cross-sectional area of metal in a localized area by stretching.
Nickel -
An elemental metal used in many steels and alloys. Also used as a protective plate, or as a bonding layer for another coating, such as silver or chromium.
Nitride -
A binary compound of nitrogen with a more electropositive element.
Nitriding -
The introduction of nitrogen into a ferrous alloy for the purpose of case hardening.
Nominal (dia. length, etc.) -
A designation used for the purpose of general identification, not necessarily related to actuality. For example, all actual diametral dimensions for a 1/4 inch external thread are less than 1/4 inch, so that the thread may pass through a 1/4 inch internal hole.
Nonferrous Metals -
Metallic alloys which contain no iron.
Normal -
An expression used to define the condition when the surface of the workpiece to be joined is perpendicular to the axis of the joining fastener and parallel to the bearing surfaces of the fastener. Also used in fastener geometry to indicate perpendicularity.
Normalize -
Notch -
A reduction in cross-sectional area of a specimen that cuts predominant grain and induces separation at load. Used as a design feature to induce separation of a fastener segment, which is used to assist driving, and is not to be a part of the finished installation.
Nut -
A part, internally threaded, intended to be mated with an externally threaded member, by rotation of either or both.Some specific types are as follows:


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