Equivalent load
For varying loads and speeds, establish a representative duty cycle first.
eyebrow
Rolling bearing life according to ISO 281
Calculate basic and modified rolling-bearing rating life.
ISO281+ 76
02
Results
Interpret bearing life
What this calculator does
From load ratings, equivalent loads, speed, and reliability, it calculates basic/modified rating life and static safety.
Basic rating life is a statistical fatigue measure. Lubrication, contamination, mounting, temperature, and the real load spectrum remain decisive.
Typical tasks
- Compare bearings for motors and gears
- Evaluate speed or load variants
- Check static safety at standstill
Design notes and follow-up standards
Check before release
Lubrication and cleanliness
Modified life is only as reliable as viscosity, fatigue-load limit, and contamination input.
Static case
Shock, slow oscillation, or standstill can make the ISO 76 check more critical than rating life.
Useful follow-up standards
ISO/TR 1281-1
Practical application of bearing load and life models.
ISO/TR 1281-2
Further guidance on modified life and system effects.
ISO 15243
Systematic classification of observed bearing damage and causes.