619/1

619/1 is a super-miniature single-row deep groove ball bearing. Its core function is to provide lightweight, high-speed, and low-friction rotational support for micro precision equipment and mechanisms with extremely limited space. With its ultra-compact design of 1mm inner diameter, 4mm outer diameter, and 1.6mm thickness, it precisely fits into micro assembly scenarios where conventional-sized bearings cannot be accommodated. It is typically made of high-grade bearing steel for the rings and rollers, and some derivative models are paired with stainless steel to meet mild anti-corrosion requirements. It is also equipped with a small precision cage to reduce friction and impact during operation, and is paired with specialized miniature bearing lubricant to further reduce the friction coefficient while firmly adhering to the interior, preventing lubrication failure under high-speed operation. This bearing has a rated dynamic load of 0.079kN and a rated static load of 0.018kN. Although it is only suitable for ultra-light load conditions, its maximum rotational speed can reach 140,000r/min, and the reference rotational speed is as high as 220,000r/min, which can meet the operation requirements of micro high-speed rotating mechanisms. It can withstand both radial loads and small bidirectional axial loads. During operation, it has extremely low noise, which meets the quiet requirements of precision equipment. Relying on its ultra-small size and reliable miniature supporting performance, it is widely used in fields such as micro motors, precision instruments and meters, small sensors, micro transmission gear sets, core components of high-end toys, mini portable electronic devices, and experimental miniature mechanical devices, providing stable, long-lasting, and maintenance-free support for various ultra-small rotating structures. It is a key component for enabling smooth rotation functions in micro devices, ensuring the smooth operation of micro equipment.