638/5

638/5 is a super-small single-row deep groove ball bearing. Its core function is to provide a low-friction, high-speed, and easy-to-maintain support solution for micro-precision rotating mechanisms with extremely limited installation space. With an inner diameter of 5mm, an outer diameter of 11mm, and a compact size of 5mm, it can easily fit into the installation space of micro-devices with strict requirements. It is made of bearing steel for the raceways and rolling elements, and is paired with a stamped steel cage. The structure is sturdy and lightweight. Additionally, the common 2Z type double-sided dust-proof cover design can effectively prevent dust and other impurities from entering the interior and prevent lubricant leakage, significantly reducing wear caused by contaminants and extending the maintenance-free period of the bearing. This bearing can not only withstand radial loads but also bidirectional axial loads. It has an extremely low friction coefficient. The reference rotational speed can reach 120,000 r/min, and the maximum rotational speed can reach 60,000 r/min, meeting the high-speed operation requirements of micro-devices. It is easy to install and has strong universality, requiring no complex maintenance procedures. Its application scenarios mainly focus on various micro-precision equipment fields, such as the transmission components of remote control models, micro motors, small precision instruments and meters, internal rotating structures of handheld portable devices, and laboratory micro-test devices, providing reliable rotational support guarantees for the smooth and long-term operation of these devices.