638/5-2Z

The 638/5-2Z is a super-small double-sided dust-proof sealed deep groove ball bearing. Its core function is to provide high protection, low friction, and long lifespan for micro precision equipment with extremely limited space. With its ultra-compact dimensions of 5mm inner diameter, 11mm outer diameter, and 5mm width, it perfectly meets the installation requirements of micro components. The 2Z type double-sided stamped steel dust-proof cover design forms a dual protective barrier, effectively blocking dust and impurities from entering the bearing interior, while preventing lubricant leakage. This significantly reduces the risk of wear caused by contaminants and extends the maintenance-free period and overall service life of the bearing. The bearing is made of high-carbon chromium bearing steel (GCr15) for the raceway and rolling elements, and after professional quenching and heat treatment, its hardness reaches HRC60-64, featuring excellent wear resistance, fatigue resistance, and dimensional stability. It is paired with a lightweight stamped steel cage and micro-bearings-specific lithium-based lubricant, resulting in a low friction coefficient and low operating noise. It can adapt to high-speed, medium-low load operating conditions and ensure the smooth operation of equipment without the need for complex maintenance. Thanks to the precise matching of "micro size + double-sided dust-proof + precise performance", it is widely used in micro motors, precision instruments and meters, remote control model transmission components, handheld portable equipment internal rotating structures, medical micro-instruments, laboratory micro-experiment devices, small electronic equipment micro-components, and precision tooling fixtures, providing efficient and long-lasting support and protection for various micro rotating mechanisms with strict requirements for installation space, clean protection, and operational stability.