Equivalent dynamic bearing load

Equivalent dynamic bearing load P for a single-row deep-groove ball bearing under combined radial and axial load, from the SKF e/X/Y factor tables for Normal/C3/C4 radial clearance.

✓ validated against legacyoriginal: /calculators/pe.htm

Radial clearanceRadial bearing load, F_rkNAxial bearing load, F_akNFactor f₀ (from bearing product table)Static load rating, C₀ (from product table)kN

Factor, f₀F_a/C₀0

Factor, e0.19

Factor, X1

Factor, Y0

Equivalent dynamic bearing load, P = XF_r+YF_a1 kN

Valid for f₀F_a/C₀ < 6.89, the extent of the underlying SKF table.

Method & references

If purely radially loaded, P = F_r. For a deep-groove ball bearing, P = F_r as long as F_a/F_r < e; if F_a/F_r > e, P = XF_r+YF_a with e, X, Y from the SKF factor table (function of f₀F_a/C₀).
A larger-than-normal radial clearance (C3, C4) trades radial clearance for reduced sensitivity to axial load.
Example defaults correspond to deep-groove ball bearing 16004 (SKF).

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

Equivalent dynamic bearing load — Engineering ABC