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).
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.
Subjects: Fluid Dynamics