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Wipers can increase the life and long term performance of ball bearing screws by preventing most dirt and other foreign matter from entering the ball nut. Wipers are standard on metric sizes of 16mm or greater and optional on most inch sizes.
The wipers for inch sizes generally fall into two categories:
internally mounted inside the extreme ends of the ball nut and held in place with retaining rings
a wiper and retainer kit combination mounted on the exterior end of the ball nut