Basic rating life

L₁₀ = (C/P)ᵖ million rev

L₁₀h = 10⁶/(60n) × (C/P)ᵖ

p = 3 ball bearings
p = 10/3 roller bearings

Inputs

• C: basic dynamic load rating
• P: equivalent dynamic bearing load
• n: rotational speed

Do not omit

• Radial + axial load factors
• Static safety
• Lubrication and contamination
• Fits, preload and internal clearance
• Temperature and speed limits

Release route

Use the bearing manufacturer's catalog/rating method for the selected bearing and duty cycle. Basic L10 is a useful sensitivity calculation, not the final system approval.