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SKF offers its recirculating and planetary roller screws for linear-actuation applications. These can sustain static loads up to 1,000 tons and dynamic loads up to 200 tons, the company says. Planetary roller screws incorporate threaded nuts, rollers, and screw shafts. Their planetary roller motion eliminates a need to recirculate the rolling elements, which serves to reduce required components and contributes to high acceleration, smoother operation and longer service life. Multiple contact points on each roller contribute to load-carrying capacity. Recirculating roller screws are designed with a threaded shaft, a nut threaded to the same lead, and a set of grooved rollers. The rollers recirculate after each revolution within the nut, which allows for fine-lead threads (as small as 1 mm) to deliver high-precision positioning and maintain greater load capacity.