<h2>Basic Info.</h2> <table> <tr><td>Bore Size</td><td>15–90 mm</td></tr> <tr><td>Outer Dimension</td><td>60–115 mm</td></tr> <tr><td>Thickness</td><td>12 mm</td></tr> <tr><td>Structure</td><td>Cylindrical</td></tr> <tr><td>Material</td><td>Bearing Steel</td></tr> <tr><td>Lubrication</td><td>Grease or Oil</td></tr> </table> <h2>Introduction</h2> Cylindrical roller bearing 307 (model N203/NJ203/NU203/NJ23ETN1), made of high-grade bearing steel, designed for radial load applications. Compact size (17×40×12 mm), precision-rated (P0–P2), vibration-controlled (Z1V1–Z3V3), and suitable for OEM/ODM use.