The SUN series covers a full range of gearless four-point contact ball slewing bearings, purpose-built for light to medium-duty rotary applications that prioritize flexible assembly, smooth motion output and low operational maintenance. Differing from traditional geared slewing rings that rely on tooth meshing for power transmission, this toothless series adopts a pure rotary structural design. It integrates streamlined mechanical profiling, optimized raceway matching and reliable material durability, delivering consistent and precise rotary performance for automation equipment, new energy machinery and general industrial rotary systems.
Construction machinery such as cranes and excavators
Aerial work platforms and man lifts
Solar tracking systems
Radar and antenna positioning systems
Materials handling and conveying equipment







| Inquiry | Type | Brand | Drawing No. | Outline Dimensions | Outer Holes | Inner Holes | Weight | Related Types | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Da[mm] | Di[mm] | U[mm] | C[mm] | da f9[mm] | di h9[mm] | La[mm] | na | φa | Li[mm] | ni | φni | [KGS] | |||||
As a toothless slewing bearing series, SUN features a seamless and tooth-free outer and inner ring structure, bringing outstanding application flexibility. Without gear meshing limitations, the bearing completely eliminates inherent problems such as transmission backlash, meshing noise and tooth wear. Equipment designers can freely configure diversified drive solutions, including servo direct drive, hydraulic rotary drive and belt drive, making it highly adaptable for customized mechanical structures and precision rotary platforms that require ultra-stable motion output.
Manufactured from premium wear-resistant alloy steel, SUN toothless slewing bearings achieve excellent structural stability and long service life. Core raceway surfaces are processed with precise induction hardening technology to enhance overall surface hardness and anti-wear capability, effectively avoiding fatigue peeling and abrasive damage under cyclic operation. Equipped with high-tightness double-sided rubber seals, the bearing forms an internal closed protection space. It effectively blocks external dust, water vapor and fine contaminants while retaining internal lubricants, ensuring stable and low-maintenance operation in various indoor and outdoor working scenarios.





