Life Expectancy: SRT Rolled Inch Screws

TO USE THIS CHART

  1. Determine required Life (in million inches of travel) at equivalent operating load.
  2. Find point at which load and life requirements intersect.
  3. Select ball nut to the right or above the intersect point.

NOTE: IF USING A BALL SCREW WITHOUT LUBRICANT DE-RATE LIFE BY 90%.

Figure 1