CRBH Series Crossed Groove Roller Bearings (Integral Inner/Outer Ring, Ultra-thin) The CRBH Series Crossed Groove Roller Bearings feature an ultra-thin design, similar to the RU Series bearings. Due to their ultra-thin design and the absence of mounting holes in both the outer and inner rings, they require a flange and support bracket for installation. Additionally, as both the outer and inner rings are integral structures, installation does not affect performance, ensuring stable rotational precision and torque. They are suitable for both foreign and domestic rotations where size miniaturization is required.