Oil & Bearing Viscosity Analyser

Two related questions in one tool: how stable is this oil across temperature (viscosity index), and is it actually thick enough for this bearing at its operating temperature (viscosity ratio κ)?

Enter the oil's ν40 and ν100 once — it drives the VI calculation, the viscosity–temperature curve, and the κ curve for your bearing.

ASTM D2270 · ASTM D341 · SKF κ

01 Oil

Kinematic viscosity at 40 °C (U)

cSt

Kinematic viscosity at 100 °C (Y)

cSt

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02 Bearing

Quick pick from lookup table Or type a designation directly

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03 Operating conditions

Rotational speed, n (rpm) Bearing operating temperature (°C)

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VISCOSITY INDEX (ASTM D2270)

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03580110200

Enter both viscosities to see the result.

VISCOSITY RATIO κ = ν / ν₁ (AT OPERATING TEMP)

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01246+

Enter the bearing and speed to see the lubrication regime.

MEAN DIA. dm

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RATED ν₁

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cSt

ACTUAL ν @ T

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cSt

04 Viscosity & κ vs temperature

Enter both viscosities to plot the curves.

Viscosity ν(T) — left axis Viscosity ratio κ(T) — right axis, fixed 0.5–6 κ = 1 (= ν₁) — where the curves cross Operating temperature