The SKF 6004 is a deep groove ball bearing (open/sealed options), with a 20mm inner diameter, 42mm outer diameter, and 12mm thickness. Made of high-carbon chromium steel (GCr15) with a pressed steel cage, the open design is suitable for frequent lubrication, while sealed types (2Z/2RS) adapt to various environments. It handles radial and bidirectional axial loads, offering low noise and high reliability.