The life of a ball screw is determined by flaking of the rolling surface caused by its fatigue. Verify a life expectancy using these expected travel distance graphs. However, in case of great impact or where lubrication or maintenance is not performed properly, the expected traveling distance becomes substantially shorter.

The graph is based on "L10" life. L10 life expresses in traveling distance a life that can be reached by 90% or more of all ball screws. If selecting a jack based on life, use the following graphs and determine the frame number first.

Expected traveling distance (km) = Actual load stroke (m)×Frequency of use (/day )×Number of operating days / year ×10^-3×Expected number of years