Viscosity Grade

Any of a number of systems which characterize lubricants according to viscosity for particular applications.

ASTM D 2422 - Standard Viscosity System for Industrial Fluid Lubricants

A number indicating the nominal viscosity of an industrial fluid lubricant at 40°C (104°F).

ISO 3448

Establishes a system of viscosity classification for industrial liquid lubricants and related fluids including mineral oils used as lubricants, hydraulic fluids, electrical oils and for other applications.


See also: Viscosity.

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Subjects: Fluid Dynamics