This 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 [1] [7]. The sealing form is divided into contact and non-contact types [1] [10]. The raceway of the four-point contact ball bearing is Gothic-shaped, and the ball and raceway form four-point contact, which can simultaneously withstand radial, axial, and torque loads [2] [5]. Materials include stainless steel, ceramics, etc., providing open and sealed structures, with cross-sectional dimensions covering metric and imperial series [4] [8] [11]. Some models use electro-permanent magnetic chuck processing technology to reduce thin-walled deformation and meet high-precision geometric tolerance requirements [9].
