619/4-2Z

The 619/4-2Z is a small precision deep groove ball bearing. Its core function is to provide high-speed, low-friction long-term rotational support for small equipment with limited space and strict requirements for bidirectional dust protection. With a 4mm inner diameter, 11mm outer diameter, and a compact size of 4mm, it precisely fits the assembly scenarios that require both sealing protection, space utilization, and operational stability. The core components are made of high-carbon chromium bearing steel (GCr15), combined with steel plate stamping cages and 2Z-type double-sided stamping dust covers, forming a dual sealing barrier that can effectively prevent dust and tiny impurities from invading from both sides, reducing lubricant leakage and internal part wear, and significantly increasing the service life in harsh environments. Special low-viscosity lithium-based lubricating grease is pre-filled to achieve low-noise operation, capable of withstanding radial loads and a small amount of bidirectional axial loads, suitable for precise conditions with light to medium loads. It has the advantages of simple structure, convenient installation, and low maintenance costs. It is widely used in miniature motors, precision instruments and meters, sensors, portable electronic devices, medical miniature equipment, small optical equipment, miniature pumps and valves, high-end toy core components, and automated miniature equipment, providing long-term support for small rotating structures that combine high protection and operational reliability.