EXAMPLE $1$:

A deep groove ball bearing rotating at $980rpm$ is expected to last $20,000hrs.$

The bearing must be re$-$greasable from both sides $($no seals$).$ The bearing must

have a bore of $40mm.$

Specify the complete bearing designation if

A$).$ The radial and axial forces on the bearing are $F_r=3\mathrm{.}6kN$ and $F_a=0\mathrm{.}78kN.$

B$).$ The radial and axial forces on the bearing are $F_r=3\mathrm{.}6kN$ and $F_a=1\mathrm{.}2kN.$