SD.20.B SD.25.B Series

SD.20.B SD.25.B Series

SD.20.B SD.25.B Series

Toothless series slewing bearings are high-performance four-point contact ball rotary components tailored for light and medium-duty industrial machinery. Featuring a gear-free integrated structure, this series abandons traditional tooth transmission design, focusing entirely on smooth rotary motion, structural simplicity and versatile installation compatibility. With refined raceway optimization and standardized industrial manufacturing,  toothless bearings deliver stable load capacity and durable operation, serving as an economical and reliable solution for modern mechanical rotary systems.


Typical Applications:

Systems requiring silent or low-noise operation, where gear teeth might generate unwanted noise

Retrofit projects where an existing drive system must be reused

Light to medium-duty turntables and positioning stages

Solar trackers and antenna positioners where belt or friction drives are preferred


  • SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series
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

All standard toothless series models are pre-fabricated with precision mounting holes to simplify positioning and installation. With a compact cross-section, lightweight structure and low rotational torque, the bearing meets the lightweight and energy-saving design requirements of modern industrial equipment. Compared with traditional roller slewing bearings, the TGB four-point contact ball structure offers smoother rotation, lower operating noise and higher cost-effectiveness for conventional medium-load applications.

Widely applicable in multiple industries, toothless four-point contact ball slewing bearings are commonly used in solar tracking systems, rotary work platforms, light engineering machinery, aerial work equipment and industrial automation rotary devices. Every product passes strict factory quality inspections including dimensional testing, hardness detection and load performance verification. Customized internal clearance adjustment, special machining and anti-corrosion surface treatments are available to meet diverse personalized working condition requirements.


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