The Koyo UC309 is a high-quality insert ball bearing featuring a 45mm bore diameter and a 100mm outer diameter. This robust bearing has an overall width of 51.6mm, including an extended inner ring designed for secure shaft attachment via two grub screws. It incorporates a spherical outer ring and a relubrication facility with a grease groove, ensuring reliable performance and extended service life in demanding agricultural, construction, and industrial machinery applications.