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Bearing Life (L10)

ISO 281 basic rating life L₁₀ = (C/P)ᵖ million revolutions, p = 3 (ball) or 10/3 (roller). At speed n, L₁₀ₕ = L₁₀·10⁶/(60·n). C, P in N; n in rpm.

Calculator

Dynamic rating C (N)

Type

Speed n (rpm, optional)

Load input

Equivalent load P (N)

Radial load Fr (N)

Axial load Fa (N)

X · Fr

Y · Fa

Equivalent load P

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L10 (Mrev)

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L10 (hours)

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X, Y come from the bearing catalogue (depend on Fa/Fr and Fa/C₀). Common ball values: X 0.56, Y 1.2–2.0.

Basic rating life (90% reliability); apply a₁/a_ISO factors as needed. A helper, not a substitute for engineering judgment.