Steinmeyer uses spacers made of durable plastic and resembling two Belleville springs back-to-back to separate recirculating balls inside the nuts of ballscrews. According to the company, ballscrews with the elastic spacers consistently obtain extremely fine slow motion. Slight compression of each spacer between two adjacent balls in assembled nuts ensures sustained, close guidance during recirculation.
The spacers have holes in the middle so adjacent balls can touch each other (through the holes) to handle excess force. The spacers do not reduce the number of load balls and can store lubricant.