According to the type of plane, there are two types: flat top surface bearings and convex top surface bearings. The flat top surface bearings and convex top surface bearings made of jewels are mainly used in various precision instruments, hydraulic measuring instruments and other instrumentation moving system, acting as an end support.

●Outer diameter (Φ) :Φ1.20 ~Φ8.00mm，outer diameter limit deviation: h7 ~ h9
●Height(H): 0.50 ~ 5.00mm，outer diameter limit deviation:h7 ~ h9
●Protrusion height(h): 0.10 ~ 0.75mm，outer diameter limit deviation: +/-0.05
●The radius of curvature (SR): 4.80 ~ 41.50mm，outer diameter limit deviation: +/-0.10
●Surface roughness (Rz): as shown in the figure.