Ball Screw RCA: Wear


Damage Condition

Severe friction resulted in serious wear on the rolling contact surface of raceways.

Possible Causes

  • Insufficient lubrication
  • Intrusion of contamination
  • Poor assemble accuracy (Misalignment)


  • Review the lubricant and lubrication method
  • Improve sealing capability
  • Take measures against misalignment


Wear 1

Part: Ball nut
Symptom: Serious wear due to severe friction
Cause: Severe wear developed because the grease was completely washed away from the ball nut when overhauling the ball screw


Wear 2

Part: Screw shaft
Symptom: Serious wear due to severe friction
Cause: Abnormal wear was caused because of fine iron contamination


Source: NSK