The Komatsu 3ED2121230 is a genuine OEM bearing designed for various Komatsu excavators, including models such as the PC200-8, PC200LC-8, PC210-8, PC210LC-8, PC220-8, PC220LC-8, and PC240LC-8. This essential component ensures smooth rotational movement and reduces friction within the machinery. It features an inner diameter of 120 mm, an outer diameter of 165 mm, and a width of 22 mm, providing precise fitment and reliable performance in heavy-duty applications.