Bearing Selection Calculator

How the L10 Bearing Life Calculator Works

The L10 bearing life is the number of hours (or revolutions) that 90% of a group of identical bearings will reach or exceed under the same operating conditions. It's calculated using the ISO 281 standard: L10 = (C/P)^p × 10⁶ / (60 × n), where C is the dynamic load rating, P is the equivalent dynamic load, p is the life exponent (3 for ball, 10/3 for roller), and n is the speed in RPM.

The equivalent dynamic load P combines radial and axial loads using bearing-specific factors: P = X·Fr + Y·Fa. The X and Y factors depend on the bearing type, contact angle, and the ratio of axial to radial load (Fa/Fr).

Our calculator also provides static safety factors (S₀ = C₀/P₀), speed utilization checks, temperature considerations, and ISO 286 fit recommendations for shaft and housing tolerances.

For complex applications involving failure analysis, custom bearing design, or fit optimization, consider Bearing Consultants or use BearingBrain chat for engineering consultations.