Designed for mechanical assemblies that require reliable radial support within constrained axial spaces, the 16004-ZZ is a premium narrow-profile deep groove ball bearing. Equipped with dual pressed-steel shields (ZZ), it effectively blocks out dust and abrasive debris while securing the factory-applied lubricant inside the raceways. Because these metal shields maintain a non-contact clearance with the inner ring, this bearing operates with minimal rolling friction and drastically reduced heat generation. This makes the 16004-ZZ an excellent solution for 20mm shaft applications, including power transmission systems, high-efficiency electric motors, and industrial textile machinery.