Thrust Ball Bearings Magnitude of Life Ratings

For thrust ball bearings, use the following equation to calculate the magnitude of life rating L₁₀ given in (Revolutions x 10⁶⁾  :

Where:

or,

When the bearings balls are larger than 1.00 inch:

or,

When bearings has two or more bearings ball rows the following equation applies:

and,

Where:

Ca = Load rating Lbs (N)
Pa = Thrust load Lbs (N)
L₁₀ = Rating life (10⁶) 
f_c =  Geometry constant ( manufacturer supplied )
Z = Number of bearing balls in single row and direction of the thrust ball bearings
D = Bearing ball diameter inches (mm)
= Contact angle degrees
F_r = Radial applied load Lbs (N)( manufacturer supplied )
F_a = Radial load factor Lbs (N)( manufacturer supplied )
X = Load factor radial( manufacturer supplied )
Y = Load factor axial ( manufacturer supplied )
Z₁, Z₂, and Z_n = Number bearings balls in rows for a multiple row thrust ball bearing
C_a1, C_a2, and C_an = Load rating of each row of single direction, or multiple row thrust ball bearing.

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