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Naphthenic Base Oils A characterization of certain petroleum products prepared from naphthenic type crudes (crudes containing a high percentage of ring type hydrocarbon molecules).

Neatsfoot Oil A pale yellow animal oil made from the feet and shinbones of cattle.

Needle Bearing A bearing comprising rolling elements in the form of rollers that are relatively long compared to their diameter.

Neutralization Number A term still used in the petroleum industry, but rapidly becoming obsolete in the lubrication field. See Acid, Strong Acid, Strong Base, Total Acid, and Total Base Numbers.

NLGI An abbreviation for “National Lubricating Grease Institute,” a technical organization serving the grease industry.

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