Rolling bearing basic rating life (L10)

Basic (L10) rating life of a rolling bearing, in millions of revolutions and in operating hours, from the catalogue dynamic load rating, equivalent bearing load and rotational speed.

✓ validated against legacyoriginal: /calculators/L10.htm

Dynamic load rating, C (from product table)10³ NBearing load, P10³ NRotational speed, nrpmLife exponent, p (3 = ball, 10/3 = roller)

Basic rating life, L₁₀ = (C/P)^p386 10⁶ rev

Basic rating life, L₁₀ₕ = L₁₀·10⁶/(60n)2297 hour

Method & references

L10 is the basic rating life in millions of revolutions at 90% reliability (10% failure probability).
P is the equivalent bearing load — see the equivalent dynamic bearing load calculator.
Exponent p = 3 for ball bearings, p = 10/3 for roller bearings.

The computation is a literal port of the original client-side JavaScript from /calculators/L10.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.

Rolling bearing basic rating life (L10) — Engineering ABC