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Rotating nut roller screws


The main purpose of this solution is to minimize the inertia phenomenon associated with long rotating shafts. SKF offers a range of satellite roller screws with the nut supported by bearings fitted inside a steel housing. The electric motor drives the nut via a tension belt, and the nut assembly moves along the fixed screw shaft.

Features and benefits

  • 72 series angular contact bearings are directly mounted on the nut outer diameter
  • Bearings are preloaded in back-to-back arrangement in order to fully support the moment created by the belt tension
  • 2 Nilos rings protect the bearings against pollution and permit lubrication for life
  • Wipers are mounted at each end of the nut in the standard configuration for better protection against contamination
  • The screw assembly is lubricated through a nipple mounted on the housing external diameter with standard SKF LGEP2, or according to customer specifications
  • SRR version with axial play
  • BRR version with backlash elimination
  • Compact solution ready for use in machinery
  • Simplified engineering for machine builders

Technical data of the SRR / BRR range

Nominal diameter
from 25 to 60 mm
from 5 to 30 mm
Basic dynamic load capacity
Up to 395 kN   
Basic static load capacity
Up to 786 kN
up to 12 000 rad/s2     
Maximum speed n x d0
up to 160 000

Typical applications

  • Production processes in automotive industry (servo-presses, tube bending, forming, locking devices etc.)
  • Process in injection moulding industry (part ejection) 
  • And many other applications

SRR/BRR series

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