<h2>Basic Info.</h2> <table> <tr><td>Inner Diameter</td><td>17 mm</td></tr> <tr><td>Outer Diameter</td><td>40 mm</td></tr> <tr><td>Thickness</td><td>12 mm</td></tr> <tr><td>Model NO.</td><td>30203 30204 30205 30206</td></tr> <tr><td>Lubrication</td><td>Grease or Oil</td></tr> <tr><td>Precision Rating</td><td>P0 P6 P5 P4 P2</td></tr> </table> <h2>Introduction</h2> High-precision angular contact ball bearings manufactured in China. Features compact dimensions (17×40×12 mm), multiple precision grades, and versatile lubrication options. Suitable for OEM/ODM applications with robust production capacity and international certification compliance.