There are several ways to designate the viscosity grades of lubricants: SAE (Society of Automotive Engineers) grades for automotive engine and gear oils, AGMA (American Gear Manufacturers Association) for industrial gear lubricants, SUS (Saybolt Universal Seconds), cSt (kinematic viscosity in centistokes), and absolute viscosity. To make up for the lack of universal grading system among manufacturers, the International Standards Organization (ISO) teamed up with other groups in 1975 to develop a standard: The International Standards Organization Viscosity Grade (ISO VG).
This comparative viscosity chart shows the relationship between the various viscosity grading systems (viscosities are related horizontally). Have any questions? Talk to one of our experts by starting a chat or by calling our toll free number: 1-855-899-7467.
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