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1. Dimensions

This bearing features a bore diameter of 1.5 mm, an outer diameter of 5 mm, and a width of 2 mm. These precise dimensions allow it to fit seamlessly into miniature mechanical systems where space is extremely limited, ensuring efficient operation without compromising on performance.

2. Material

• Inner and Outer Rings: The inner and outer rings of the S691XZZ stainless steel bearing are crafted from premium 440C stainless steel. 440C is a high - carbon martensitic stainless steel, renowned for its exceptional corrosion resistance. It can withstand exposure to water, moisture, salt spray, and a variety of mild chemicals, making it ideal for use in humid or potentially corrosive environments. Additionally, 440C offers high hardness after heat treatment, providing excellent wear resistance and durability, which are crucial for maintaining the bearing's structural integrity during prolonged operation.

• Balls: The balls within the bearing are also made of 440C stainless steel. They undergo precision grinding to achieve a smooth surface finish and accurate spherical geometry. This precision ensures minimal friction between the balls and the raceways of the inner and outer rings, facilitating smooth rotation. The 440C stainless steel balls also contribute to the bearing's overall corrosion resistance and load - carrying capacity.

• Shields (ZZ): The double shields, denoted by "ZZ", are constructed from stainless steel. These shields are thin yet robust, forming a effective barrier against dust, dirt, and other particulate contaminants. Unlike carbon steel shields, the stainless steel shields enhance the bearing's resistance to corrosion, ensuring that the protective function of the shields remains intact even in harsh environments. They are designed to fit tightly around the bearing, preventing the ingress of contaminants without impeding the bearing's rotation.

3. Performance

• Corrosion Resistance: One of the most significant performance advantages of the S691XZZ stainless steel bearing is its superior corrosion resistance. Thanks to the 440C stainless steel material, it can operate reliably in wet, humid, or corrosive conditions where conventional chrome steel bearings would quickly rust and fail. For example, in marine environments with high salt content in the air, this bearing remains unaffected by corrosion, ensuring long - term performance.

• Load - Carrying Capacity: Despite its small size, the S691XZZ stainless steel bearing boasts a commendable load - carrying capacity. The combination of the 440C stainless steel's high strength and the deep - groove design allows it to handle both radial and axial loads effectively. The even distribution of loads across the balls and raceways ensures that the bearing can support rotating shafts in various miniature applications, such as small pumps and precision instruments.

• Temperature Resistance: This bearing exhibits good temperature resistance, capable of operating within a relatively wide range of temperatures. It can withstand low - temperature environments without losing its mechanical properties and can also perform stably in moderately high - temperature settings, making it suitable for applications where temperature fluctuations are common, such as in some industrial ovens' auxiliary components or refrigeration equipment.

• Rotational Speed and Friction: The S691XZZ stainless steel bearing maintains a high rotational speed capability. The smooth interaction between the precision - ground stainless steel balls and raceways, along with appropriate lubrication, results in low friction during operation. Low friction not only reduces energy consumption but also minimizes heat generation, allowing the bearing to operate at high speeds for extended periods without overheating. This makes it suitable for use in small - sized motors and spindles that require high - speed rotation.

4. Sealing

The double stainless steel shields provide effective sealing performance. They prevent the entry of dust, dirt, and other solid contaminants into the bearing's internal components, safeguarding the balls and raceways from abrasive wear. While the shields are not completely waterproof, they offer a certain degree of protection against splashing water and moisture, further enhancing the bearing's suitability for use in damp environments. The sealing function also helps to retain the lubricant within the bearing, ensuring consistent performance over time.

5. Applications

• Food and Beverage Industry: In the food and beverage industry, where hygiene and corrosion resistance are critical, the S691XZZ stainless steel bearing finds extensive use. It is employed in small - sized conveyors, mixers, and filling machines. For instance, in a small juice - bottling machine, the bearing's corrosion resistance prevents contamination from fruit juices and cleaning agents, ensuring compliance with strict hygiene standards.

• Medical and Pharmaceutical Equipment: Medical devices and pharmaceutical machinery often require bearings that can withstand frequent cleaning and sterilization. This stainless steel bearing is ideal for use in small motors of medical pumps, surgical tools, and laboratory analyzers. Its resistance to corrosion from disinfectants and sterilizing agents ensures reliable operation and long service life in these critical applications.

• Marine and Coastal Equipment: The S691XZZ stainless steel bearing is well - suited for marine and coastal applications. It can be used in small - sized winches, sensors, and pumps on boats and coastal facilities. Its ability to resist corrosion from saltwater and humid marine air ensures that it performs reliably in these harsh environments, reducing maintenance requirements and downtime.

• Outdoor and Recreational Gear: Outdoor equipment such as small - sized power tools, camping appliances, and sports equipment benefits from this bearing. For example, in a small electric fishing reel, the bearing's corrosion resistance and smooth rotation ensure consistent performance even when exposed to water and moisture during fishing trips. In portable camping fans, it enables quiet and efficient operation, enhancing the camping experience.