SKF
Super-Precision Axial-Radial Cylindrical Roller Bearings
SKF super-precision axial-radial cylindrical roller bearings combine a radial needle roller or cylindrical roller bearing with an axial cylindrical roller bearing in a single, ultra-precise unit. They provide simultaneous radial and axial support with separate load paths, enabling extremely high stiffness and running accuracy in rotary tables, indexing heads, and machine tool axes. The axial component typically features a bi-directional or single-direction cylindrical roller thrust set, while the radial part is a full complement or caged cylindrical roller. These bearings are designed for very low runout (< 1 µm) and high axial stiffness, ensuring that work piece or tool position is held perfectly during machining. SKF supplies them as ready-to-install units, precision ground and preloaded, often with integrated gearing or mounting holes.
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Combined Load Support
Handles heavy axial and radial loads separately for maximum precision.
Micron-Level Accuracy
Runout values below 1 µm for the highest positioning tasks.
Very High Stiffness
The large number of rollers in both directions resists deformation.
Preloaded, Ready-to-Mount
No assembly of multiple bearings; exact factory preload.
Integrated Functionality
Can include gearing, bolt holes, or sealing surfaces.
Long Life Under Moment Loads
Designed for rigorous tilting stiffness in tables.
Application in CNC Rotary Tilting Tables
5-axis machining centres use rotary tilting tables that demand bearings with perfect axial and radial precision. SKF axial-radial cylindrical roller bearings provide the necessary stiffness and accuracy under both axial workpiece weight and radial cutting forces, ensuring parts are machined to exact geometry.
Customization Capabilities
SKF can integrate outer ring gear teeth, inner ring teeth, or threaded mounting holes to simplify the customer’s assembly. Pre-drilled lubrication channels and seal grooves further reduce design complexity for machine tool builders.