• 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 features a bore diameter of 1.5 mm, an outer diameter of 5 mm, and a width of 2 mm. These compact dimensions allow it to fit into tight spaces, making it suitable for integration into small - scale machinery and devices where space is a critical constraint.

2. Material

• Inner and Outer Rings: The inner and outer rings are typically made from high - quality chrome steel, such as AISI 52100. Chrome steel offers excellent hardness and wear resistance, which are essential for withstanding the frictional forces generated during rotation. It provides good mechanical strength, enabling the bearing to handle moderate loads effectively. However, chrome steel lacks the corrosion resistance of stainless steel, so the bearing is more susceptible to rust in moist or humid environments.

• Balls: The balls within the 691XZZ bearing are also manufactured from chrome steel. They undergo precision grinding to ensure a smooth surface and accurate spherical shape, which helps to minimize friction and ensure smooth rotation. The chrome steel balls work in conjunction with the raceways of the inner and outer rings to distribute loads evenly, contributing to the bearing's overall load - carrying capacity.

• Shields (ZZ): The double shields, marked as "ZZ", are made from thin carbon steel. These shields serve to protect the internal components of the bearing from dust, dirt, and other small particles. They form a physical barrier that prevents contaminants from entering the bearing and causing damage to the balls or raceways. While carbon steel shields provide basic protection, they do not offer corrosion resistance, so they are best suited for dry operating conditions.

3. Performance

• Load - Carrying Capacity: The 691XZZ bearing has a decent load - carrying capacity for its size. Thanks to the high strength of chrome steel and the deep - groove design, it can handle both radial and axial loads. The even distribution of loads across the balls and raceways allows it to support rotating shafts in small motors, precision tools, and other miniature equipment. For example, in a small toy car motor, it can effectively support the shaft and ensure smooth operation under the typical loads encountered.

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

• Friction and Wear: The precision manufacturing of the chrome steel components results in low friction during operation. Low friction not only reduces energy consumption but also helps to minimize wear on the bearing's parts, extending its service life. However, in environments with contaminants or insufficient lubrication, the wear rate can increase significantly.

• Corrosion Resistance: As mentioned earlier, the 691XZZ bearing has limited corrosion resistance due to its chrome steel construction. It is prone to rust when exposed to water, moisture, or corrosive substances. Therefore, it is important to use this bearing in dry environments and take appropriate measures to protect it from moisture if necessary.

4. Sealing

The double carbon steel shields provide effective protection against the ingress of dust, dirt, and other solid contaminants. They help to keep the lubricant inside the bearing, ensuring that the internal components remain properly lubricated for smooth operation. However, the shields are not waterproof, so the bearing should not be used in wet or submerged environments. If the bearing is exposed to moisture, it is more likely to rust and fail prematurely.

5. Applications

• Consumer Electronics: It is commonly used in various consumer electronics products. For instance, in small digital cameras, it can be found in the lens adjustment mechanism, enabling smooth and precise movement of the lens for focusing. In portable media players, it helps to ensure the smooth rotation of the disc drive or other moving parts.

• Toys and Hobbies: Many toys and hobby items rely on the 691XZZ bearing. In remote - controlled helicopters, it is used in the small motors that power the rotor blades, providing reliable support and enabling smooth rotation. In model trains, it helps to reduce friction in the wheel assemblies, allowing for smooth movement along the tracks.

• Office Equipment: Small office machines such as printers, scanners, and copiers utilize this bearing in their internal mechanisms. In a small printer, it can be found in the paper feeding system, helping to ensure that the paper is transported smoothly through the machine. In scanners, it contributes to the smooth movement of the scanning head.

• Household Appliances: It is also used in some small household appliances. For example, in electric toothbrushes, it supports the rotating brush head, ensuring that it spins smoothly for effective cleaning. In small fans, it helps to keep the motor running smoothly, providing a consistent airflow.