SD.18.25.30.D R Bearings

SD.18.25.30.D R Bearings

SD.18.25.30.D R Bearings

The gearless single-row crossed roller slewing bearing is a precision-engineered rotational component developed for applications that require high accuracy, exceptional rigidity, and a clean, unobstructed interface for external drive systems. By eliminating gear teeth from both rings, this design offers a streamlined solution that prioritizes bearing performance while allowing engineers to design the drive system independently.


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



  • SD.18.25.30.D R Bearings
  • SD.18.25.30.D R Bearings
  • SD.18.25.30.D R Bearings
InquiryType Brand Drawing No.DimensionsFixing HolesWeight
Da [mm]U [mm]C [mm]Di [mm]Ha [mm]Hb [mm]H [mm]La [mm]na [mm]da [mm]Li [mm]ni di [mm]KG

This bearing series consists of an inner ring, an outer ring, and a single row of cylindrical rollers arranged in a crossed pattern between precision-ground raceways. Both rings are manufactured without gear teeth, featuring smooth outer surfaces that simplify integration into machine designs. The rollers are oriented with their axes alternating at 90-degree angles, creating an arrangement that efficiently manages axial loads from both directions, radial loads, and tilting moments simultaneously. The crossed roller geometry provides line contact with the raceways, delivering superior load-carrying capacity and enhanced rigidity compared to ball bearings of similar dimensions.

The absence of gear teeth simplifies manufacturing, reduces production costs, and makes the bearing easier to handle during transportation and installation. Both rings incorporate mounting holes for secure bolted attachment to the machine structure.


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