ball lenses

Jewel bearings 

For good mechanical properties and hardness( Mohs 9), sapphire and ruby are often used for the bearing of many meters, clocks, parts of abrasion-resistance. V-shape and U-shape bearing are widely used in flowmeters, ammeters, water meters.
Specification
Outside Diameter: 0.*0~*0.*0mm, max deviation of outside diameter: h7~h9
Height H: 0.*0 ~ 5.*0mm, max deviation of height: ±0.*1
Cup depth h: 0.*0 ~ 0.*0mm, max deviation of cup depth: 0 ~ 0.*6
Curvature radius SR: 0.*0 ~ 5.*0mm, max deviation of curvature radius: ±0.*3
Taper: *0°~ **0°max deviation of taper: ±5°
Technical Index
Material: Synthetic sapphire/ruby single crystal a-Al2O3, natural agate, crystallite glass and ceramic, etc.