Section II. WORDS AND TERMS
AXIAL - Situated around, in the direction of, on, or along an axis.
BURR - Local rise of material forming a protruding sharp point or high spot.
CORROSION - Chemical reaction between surfaces of material and environment to which it is
subjected. Generally appears as rust on steel, or as a light-colored powdery coating on
aluminum or magnesium.
Advanced forms of corrosion will result in pitting.
CRACKS (BREAKS) - Surface or material breakage caused by stress which results in partial or
complete separation of material.
DISTORTION - Loss of original shape, either local or over an area. Includes bends, twisting,
warping, dents, flattening, crushing, or kinking.
ELONGATION - Stretching or lengthening of original dimensions, usually applies to bolt holes.
GOUGES - Grooves in or breakdown of metal surface from foreign contact under heavy
pressure. Usually loss of material, rather than displacement.
LEAKAGE - Any evidence of a fluid beyond its container.
NEWTON - Metric term for force.
NEWTON METER - Metric term for torque.
NICKS - Small grooves or notches.
Usually displacement of material, rather than loss.
OVERHEATING - A condition indicated by discoloration of parts which usually results in a loss
of hardness. Usually caused by a lack of lubrication, malfunction of parts, or excessive wear.