Selecting the Suitable Hydraulic Fluid Viscosity (ISO 3448:1992)

Selecting suitable viscosity for system operation with a hydraulic fluid is very important. ISO 3448:1992 viscosity classification is consequently based on kinematic viscosity at 40°C, and we list the common viscosity classification for hydraulic systems.

Please check the viscosity at 40°C before selecting a fluid.

※Note: If your application required low viscosity (under 6 mm2/s), please contact Winner’s sales department.
Recommendations ISO 3448:1922
● System for short time operation or clamping devices.
● System for continuous operation (Operation in winter)		 VG 10, VG 15
● General application (Operation in summer) VG 22, VG 32
● System in tropical condition at ambient temperature up to 40℃ or closed rooms (temperature during start higher than 20℃) VG 46, VG 68
Winner Test Conditions:
Temperature: 40℃
Viscosity: ISO VG 32
Cleanliness grades meets or exceeds: ISO 19/17/14 (ISO 4406), NAS 8 (NAS 1638)

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