A roller screw, also known as a planetary roller screw or satellite roller screw, is a low-friction precision screw-type actuator, a mechanical device for converting rotational motion to linear motion, or vice versa.

Roller screws—also called planetary roller screws—have precision-ground screw threads that match multiple precision-ground rollers in the nut. These rolling elements provide more points of contact, allowing for higher force capability and longer life.

Nook Planetary Roller Screws (NRS), a member of the lead screw family, are remarkable devices designed to convert rotary motion into axial force or vice versa. They offer multiple advantages and reliability for the most demanding applications.

Creative Motion Control’s Planetary Roller Screws transform rotary motion into linear movement. The rolling elements consist of threaded rods which enable excellent force density, very high load capacities, and long life.

CMC planetary roller screws utilize threaded rollers as rolling elements instead of bearing balls, as are used in ball screws. This pro-vides a dramatically larger load transfer con-tact surface, which correlates to a much high-er load capacity and longer life.

Planetary roller screws use threaded rollers that are toothed to mesh with geared rings at each end of a nut. The rollers spin on their axes and orbit around the nut, in a planetary configuration. Planetary roller screws are capable of higher force transmission because the rollers have more contact with screw threads.

Planetary roller screws are used in the most critical, demanding and precise applications requiring linear motion. Roller screws offer a perfect replacement for hydraulics because of the load and cycle capability. Examples of industries and applications for planetary roller screws include: Standard Features

Developed to meet the needs of leading-edge machine manufacturers across a wide range of industries, Moog ball screws and planetary. Robust design suited to heavy duty applications, vibration and harsh environments. Works on same principle as a planetary roller screw.

Capable of handling heavy loads, planetary roller screws contain precision ground rollers engaged with a precision ground screw. When compared with a ball screw of the same size and lead, the roller screw components are designed to have increased …

Apr 11, 2025 · Planetary roller screws are a next-generation alternative to ball screws, able to withstand higher loads and last longer—both vital qualities for the wear and tear humanoid robots are expected ...