638-Z

The 638-Z, as a 638 series small single-sided dust-proof sealed deep groove ball bearing (standard specification with an inner diameter of 8mm), its core function is to provide low-friction and highly stable rotational support for small equipment with limited space and a need for basic cleanliness protection. With a compact structure size of 8mm inner diameter, 16mm outer diameter, and 5mm width, it inherits the basic advantage of deep groove ball bearings that can simultaneously bear radial loads and a small amount of bidirectional axial loads. Through the Z-type single-sided stamping steel dust-proof cover design, it effectively blocks dust and impurities from entering the bearing interior, reduces lubricant leakage and internal part wear, and extends the equipment's operating life and maintenance cycle. It is made of high-carbon chromium bearing steel (GCr15) for the rings and rollers, and after professional quenching and heat treatment, its hardness reaches HRC60-64, featuring excellent wear resistance, fatigue resistance, and dimensional stability. Combined with a lightweight stamping steel cage and universal lithium-based lubricant, it has a low friction coefficient and low operating noise, and can meet the high-speed operation requirements under medium to low loads without complex maintenance, ensuring the smooth operation of the equipment. This bearing, with its high cost-performance advantages of "compact size + basic dust-proof + reliable performance", is widely used in small motors, power tools, office equipment, light industrial machinery, micro transmission mechanisms, handheld portable devices, precision instruments and meters auxiliary components, and small electronic equipment rotating structures, providing efficient and economical support and protection for various small rotating mechanisms with requirements for installation space and basic protection.