Bearing life & dynamic rating (ISO 281)

Check a bearing against required service life, or compute the basic rated life from the applied load.

P = f_p·(X·F_r + Y·F_a) | L_10h = 10⁶/(60·n)·(C_r·f_t/P)^ε | C_req = (P/f_t)·(60·n·L_h/10⁶)^1/ε (ε=3 ball, 10/3 roller)

Input data

Bearing designation Pick a designation to auto-fill Cr, C0 and dimensions, or enter them manually.

Contact angle / style

Radial load Fr (N)

Axial load Fa (N)

Speed n (r/min)

Basic dynamic load rating Cr (N)

Basic static load rating C0 (N)

Axial factor Y1 (taper only)

Load factor f_p fp accounts for impact / vibration.

Temperature factor f_t ft for operating temperature > 120 °C.

Required life L_h (h)

Life exponent ε

Equivalent dynamic load P	— N
e / X / Y	—
Calculated life L10h	— h
Required dynamic load rating C	— N
Rating check	—