SKF
Angular Contact Thrust Ball Bearings for Screw Drives
SKF angular contact thrust ball bearings for screw drives are high-precision, single-direction and double-direction thrust bearings specifically developed to support ball screws and lead screws in CNC machine tools, injection moulding machines, and precision actuators. They have a large number of small-diameter balls with a 60° contact angle, providing very high axial stiffness and low friction. SKF offers these in BS series (single direction, usually used in pairs or sets) and BTM series (double direction, ready-to-mount unit). They are produced to P4 tolerance, with high running accuracy and low vibration. Universal matching allows simple pairing for combined axial loads. The bearings are available with sealed and open configurations. Correct selection ensures exact tool positioning, reduced heat build-up, and long service life even under rapid traverse and high acceleration.
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Trusted by Industry Leaders
60° Contact Angle
Maximises axial stiffness for screw support.
High Ball Count
Distributes load; minimal elastic deflection under feed forces.
Universal Matched Sets
Easy pairing for back-to-back or tandem mounting.
Sealed Versions Available
Contaminant exclusion with low-friction seals.
Minimal Frictional Torque
Precise surface finish ensures smooth motion.
Long Life at High Speeds
Designed for rapid traverses and high duty cycles.
BS Series Bearing Arrangements for Ball Screws
A typical fixed-end support uses three or four BS series bearings in a back-to-back/tandem combination to provide massive axial stiffness in both directions. The floating end uses a deep groove or needle roller bearing. SKF’s universal matching simplifies the assembly of these bearing stacks.
Lubrication for High-Speed Screw Drives
At traverse rates above 60 m/min, grease may overheat. SKF recommends oil-air lubrication with a minimal quantity to reduce friction and heat. Sealed bearings with low-temperature grease are suitable for moderate-speed applications, reducing maintenance.