This is a replacement bottom roller for the track system on certain Kubota mini excavators. Fits models: KX121-3, KX121-3S, and KX040-4. Part numbers: RD118-21700 and RD148-21700. It’s made to handle the wear and tear of digging, with a hardened surface (HRC 52-58) and grade 12.9 bolts. The package includes one roller. Always double-check your machine’s model and the part number on your old roller before ordering to ensure it’s the right match. A straightforward repair part to keep your excavator moving.
