Engineering tool · viscosity and grease interval
κ = ν / ν1Lubrication & Relubrication Calculator
Estimate lubricant viscosity at operating temperature, the κ ratio and a condition-adjusted grease interval.
Lubrication condition
Check viscosity and interval
Use the lubricant's published 40 °C and 100 °C viscosities. The base relubrication interval and required viscosity ν1 must come from the bearing manufacturer.
RESULT / 03
Lubrication condition
Temperature-corrected viscosity and interval
Viscosity ratio κ——
Operating viscosity ν—Walther interpolation
Adjusted interval—before application approval
Calendar interval—continuous-operation equivalent
Temperature factor—relative to 70 °C
κ = ν / ν1
Calculation method
Two separate checks
Film adequacy is described by κ; grease replenishment starts from a manufacturer base interval and is then reduced for actual conditions.
01 / VISCOSITYκ = ν / ν1
Most rolling-bearing applications target κ between 1 and 4 at operating temperature.
02 / TEMPERATUREAbove 70 °C: halve each +15 °C
No automatic extension is applied below 70 °C in this conservative implementation.
03 / LIMITBase interval is not calculated here
Obtain it from the exact bearing, grease, speed factor and load guidance.