• Deep Groove Ball Bearing
• Self-aligning Ball Bearing
• Angular Contact Ball Bearing
• Thrust Ball Bearing
• Tapered Roller Bearing
• Spherical Roller Bearing
• Cylindrical Roller Bearing
• Spherical Roller Thrust Bearing
• Cylindrical Roller Thrust Bearing
• Needle Roller Bearing
• Pillow Block Bearing
• Plummer Block Housing
• Adapter Sleeve & Withdrawal Sleeve
• Spherical Plain Bearing & Rod End
• Linear Motion Ball Bearing
• Auto Bearing
• Agricultural Bearing
• Stainless Steel Bearing
• Full Ceramic Bearing
• Steel Ball
• Special Bearing

1. Dimensions

It shares the same compact dimensions as its counterparts, with a bore diameter of 1.5 mm, an outer diameter of 4 mm, and a width of 1.2 mm or 2 mm. This small size makes it highly suitable for integration into devices where space is strictly limited.

2. Material

• Inner and Outer Rings: The inner and outer rings are typically made from high - grade chrome steel, such as AISI 52100. This material offers excellent hardness and wear resistance, which are crucial for maintaining the bearing's structural integrity during prolonged use. Chrome steel has a high carbon content, which contributes to its ability to withstand the stresses of rotation and load - bearing. However, unlike stainless steel, it is more susceptible to corrosion when exposed to moisture or harsh chemicals, so it requires proper protection in such environments.

• Balls: The balls inside the 681XZZ bearing are also fabricated from chrome steel. They are precision - ground to ensure a smooth surface and accurate spherical shape, which are essential for reducing friction and enabling efficient rotation. The chrome steel balls work in conjunction with the raceways of the inner and outer rings to distribute loads evenly.

• Shields (ZZ): The double shields ("ZZ") are made from thin carbon steel. These shields act as a barrier to prevent dust, dirt, and other small particles from entering the bearing's internal components. While they provide basic protection, they do not offer the same level of corrosion resistance as stainless steel shields, so the bearing needs to be used in relatively dry and clean environments.

3. Performance

• Load - Bearing Capacity: Thanks to the high strength of chrome steel, the 681XZZ bearing has a commendable load - bearing capacity for its size. It can handle both radial and axial loads effectively, with the deep - groove design ensuring that the load is evenly distributed across the balls and raceways. This allows it to support the rotating shafts in small motors and other miniature equipment without premature failure. For example, in a small toy motor, it can easily bear the load of the rotating shaft during operation.

• Rotational Speed: It is capable of operating at high rotational speeds. The smooth contact between the chrome steel balls and the raceways, along with the optimal internal clearance, minimizes friction and allows for efficient rotation. Under proper lubrication and operating conditions, it can achieve rotational speeds suitable for many small - scale applications, such as in precision spindles of small fans.

• Friction and Wear: The chrome steel material, combined with precise manufacturing, results in low friction during operation. Low friction not only reduces energy consumption but also minimizes wear on the bearing's components, extending its service life. However, in environments with moisture or contaminants, the wear rate may increase if proper maintenance is not carried out.

• Corrosion Resistance: Compared to stainless steel bearings, the 681XZZ bearing has limited corrosion resistance. Chrome steel is prone to rust when exposed to water, humidity, or corrosive substances. Therefore, it is best suited for dry, indoor environments where it is not in contact with such elements.

4. Sealing

The double carbon steel shields provide adequate protection against the ingress of solid contaminants like dust and debris. They help to keep the lubricant inside the bearing, ensuring smooth operation. However, the shields do not provide a waterproof seal, so the bearing should not be used in wet or submerged environments.

5. Applications

• Consumer Electronics: It is widely used in various consumer electronics, such as small cameras, portable media players, and mini - drones. In a small camera's lens adjustment mechanism, the bearing enables smooth and precise movement of the lens, ensuring clear image capture. In mini - drones, it supports the small motors that power the propellers, contributing to stable flight.

• Toys and Models: Many toys and hobby models, including remote - controlled cars, airplanes, and robots, rely on the 681XZZ bearing. In a remote - controlled car's gearbox, it reduces friction between the gears, allowing for efficient power transmission and smooth movement of the vehicle.

• Office Equipment: Small office devices like printers, scanners, and shredders utilize this bearing in their internal mechanisms. For instance, in a small printer's paper feeding system, it helps the rollers rotate smoothly, ensuring reliable paper handling.

• Household Appliances: It can be found in small household appliances such as electric shavers, hair dryers, and mini - blenders. In an electric shaver, the bearing supports the rotating blades, enabling them to move quickly and smoothly for a comfortable shaving experience.