[Core Dimensions]Inner diameter d=90mm，Outer diameter D=125mm，Width B=18mm [Rated Load]Basic dynamic load rating Cr=32.8kN，Basic static load rating Cor=31.5kN [Limiting Speed]Limiting speed (grease lubrication)4500rpm，Limiting speed (oil lubrication)5300rpm [Weight]0.53kg [Application Scenarios]Widely used inprecision instruments、low-noise motors、automobiles and motorcycles、industrial robots、aerospace、medical devices、semiconductor manufacturing equipmentand other fields with high requirements for space, weight and rotation accuracy。

61900 series bearings are ultra-thin deep groove ball bearings, formerly designated as 1000900 series. Compared with the 61800 series, they feature a larger cross-section width and larger ball diameters for the same bore size, providing significantly higher radial load capacity. The standard deep groove design accommodates radial loads as well as limited bidirectional axial loads, with low friction and high limiting speeds.

Available in P0, P6, and P5 accuracy grades, with material options of GCr15 bearing steel or 440C stainless steel. Various sealing configurations are offered including open, 2Z metal shields, and 2RS rubber seals. Widely used in harmonic drives, precision gimbals, optical instruments, medical equipment, compact automation shafts, and lightweight motors where installation space is limited and precision operation is required.