Glossary of Lubrication Terms

This glossary is designed to help the understanding of some of the terms used in Tribology and Lubrication Engineering. Quickly look up a definition or explanation for a topic.
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Load-Wear Index (LWI) – Measure of the relative ability of a lubricant to prevent wear under applied loads; it is calculated from data obtained from the Four-Ball EP Method. Formerly called mean Hertz load.

Lubricant – Any usually oily liquid or solid that reduces friction, heat, or wear when applied to the surfaces of moving parts.

– The control of friction and wear by the introduction of a friction-reducing film between moving surfaces in contact. The lubricant used can be a fluid, solid, or plastic substance.

Lubricity – The ability of an oil or grease to lubricate (also called film strength). Lubricity can be enhanced by additive treatment.