6221 Deep Groove Ball Bearing 105x190x36mm Heavy‑Duty for Industrial Transmission Product Overview 6221 is open‑type single row deep groove ball bearing for medium‑heavy industrial rotating assemblies. It primarily carries radial load and can also bear light bidirectional axial loads. Open‑style design requires external lubrication supply on site during assembly. Made of GCr15 bearing steel, it delivers stable performance for large‑size general machinery. Standard CN