684ZZ Ultra-Miniature Shielded Bearing 4×9×4mm

The precision and performance of each component determine the stability of the equipment operation. We are deeply engaged in the bearing manufacturing industry, relying on a full-category bearing product matrix. Covering Stainless steel bearing, Ball bearing, Deep groove ball bearing, Non-standard bearing, Small bearing and Water pump bearing, with its advanced technology and strict quality control, provides reliable transmission solutions for the global industry. ​

The 684ZZ ultra-miniature shielded bearing, measuring 4×9×4mm, is the ultimate masterpiece among Small bearings. With its extremely small size of 4×9×4mm, it precisely fits micro-devices with extremely strict space requirements, such as micro-motors, precision sensors, and medical endoscope drive devices. Its double dust cover (ZZ) shielding structure is made of high-strength stamped steel and is closely combined with the inner and outer rings of the bearing through precise riveting process, forming a tight protective barrier. It has been verified by IP54 protection level test and can effectively prevent the intrusion of dust, debris and other impurities. Even in dusty industrial environments or complex laboratory scenarios, It can also ensure the cleanliness and stable operation of the precision components inside the bearing, significantly reducing equipment maintenance costs and downtime risks. ​

This bearing adopts high-carbon chromium bearing steel of the same high-quality standard as Stainless steel bearing. After quenching and tempering as well as deep cryogenic treatment processes, the surface hardness is as high as HRC60-62, and it has excellent wear resistance and corrosion resistance. As a member of the Ball bearing family, it adopts the classic point contact rolling element design, combined with the symmetrical Deep groove raceway structure of Deep groove ball bearing. Through mechanical simulation and actual tests, it can withstand a radial load of up to 0.6kN and an axial load of up to 0.2kN. During operation, the friction coefficient is as low as 0.005. At a high-speed operation of 15,000 r/min, the vibration value is ≤6.5m/s² and the noise level is ≤40dB, providing stable and efficient power transmission for high-precision and high-speed micro-transmission systems. ​

If your project has special specification requirements, our Non-standard bearing customization service will provide an all-round personalized customization solution based on equipment parameters and working conditions, from material selection, sealing form to tolerance grade. In the application of small water pump equipment, the 684ZZ ultra-miniature shielded bearing was tested under simulated high-frequency start-stop and continuous vibration conditions of the water pump. The dynamic load coefficient (C) reached 0.75kN. After continuous operation for 1000 hours, the change in bearing clearance was ≤0.005mm. It shows stable performance comparable to that of Water pump bearing, effectively ensuring the long-term efficient operation of the micro water pump system. ​

From the precise operation of micro-electronic devices to the micro-transmission of industrial automation, the 684ZZ ultra-miniature shielded bearing 4×9×4mm, with its outstanding performance, works hand in hand with our full range of main products to provide solid support for mechanical operation and help various industries embark on a new journey of high efficiency and stability.