XA XSARoller bearings

XA XSA Roller bearings

XA XSA Roller bearings

The single-row crossed roller slewing bearing with external gear is a precision-engineered rotational component designed for applications requiring high accuracy, exceptional rigidity, and reliable performance in a compact package. This bearing type incorporates cylindrical rollers arranged in a crossed pattern, delivering superior load capacity and rotational precision compared to conventional ball bearing designs.


Application Areas:

Robotics and automation equipment

Precision rotary tables and indexing systems

Radar and antenna positioning systems

Medical imaging and radiotherapy equipment

High-accuracy solar tracking systems

Machine tools and coordinate measuring equipment



  • XA XSA Roller bearings
  • XA XSA Roller bearings
InquiryTypeBrandBoundary DimensionMounting DimensionStructure SizeGear InformationRated Axial Static LoadWeight [KGS]
Da[mm]di[mm]H[mm]La[mm]Lin1n2φ1φ2bhBCDidamzdo

This bearing series comprises an inner ring, an outer ring with integral external gear teeth, and a single row of cylindrical rollers arranged in a crossed configuration between the raceways. The rollers are positioned with their axes alternating at 90-degree angles, creating a design that efficiently manages axial loads in both directions, radial loads, and tilting moments simultaneously. This crossed roller geometry provides line contact with the raceways, resulting in greater load-carrying capacity and enhanced rigidity compared to ball bearings of similar dimensions.

The external gear is formed directly on the outer ring surface, enabling direct engagement with a drive pinion without requiring separate gear components. This integration simplifies the drive system and reduces overall part count. Both rings incorporate mounting holes for secure bolted attachment to the machine structure.


Series HJ-Single Row Cross Roller Slewing Bearing-Internal gear.jpg