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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.