Thin walled bearings are small and lightweight bearings with ultra-thin cross-sectional structures, mainly divided into sealing forms such as rubber sealed RS and iron sealed ZZ, produced by manufacturers such as Luoyang Pruson. Its inner diameter to outer diameter ratio is ≤ 1.25, and it adopts an equal cross-section design to maintain high precision and strong load-bearing capacity. The structure covers various types such as thin-walled cross roller bearings, deep groove ball bearings, and four point contact ball bearings The bearing adopts a small outer diameter steel ball design to reduce friction torque and improve rotational accuracy, and achieves lightweight and wiring space optimization through a hollow shaft structure . Sealing forms are divided into two categories: contact type and non-contact type . The raceway of a four point contact ball bearing has a Gothic arc shape, and the ball and raceway form a four point contact, which can simultaneously withstand radial, axial, and torque loads . The materials include stainless steel, ceramics, etc., providing open and sealed structures, with a cross-sectional size range covering metric and imperial series . Some models use electric permanent magnet suction cup processing technology to reduce thin-walled deformation and meet high-precision geometric tolerance requirements
