Product structure:

The 694 ZZ is a miniature, deep groove ball bearing with a standard metric designation. Its key dimensions are a 4 mm inner diameter (d), a 11 mm outer diameter (D), and a 4 mm width (B). The "ZZ" suffix indicates that it is equipped with two non-removable metal shields (one on each side), providing effective protection against dust and debris while retaining lubricant internally. Its structure consists of an inner ring, an outer ring, a complement of precision steel balls, a cage (typically steel or nylon) to separate and guide the balls, and the two ZZ shields. This shielded, deep groove design is the most common and versatile type of radial ball bearing.

Key performance features:

The 694 ZZ bearing offers an excellent balance of performance characteristics for its size. It provides high rotational speed and precision with minimal friction, enabling smooth operation in sensitive instruments. The dual metal shields (ZZ) offer robust contamination protection and are ideal for environments where dirt is a concern, though they are not designed for fluid immersion. It exhibits low noise and vibration levels, crucial for consumer electronics and quiet appliances. Despite its small size, it has good radial load capacity relative to its dimensions. It is generally pre-lubricated with grease for maintenance-free operation over its service life and is known for its cost-effectiveness and reliability in high-volume applications.

Main application scenarios:

This bearing is specifically engineered for compact mechanisms requiring reliable, high-speed rotation. Typical application scenarios include: serving as the main shaft support in small cooling fans for computers and power supplies; functioning as the critical rotor bearing in miniature DC motors for toys, drones, and automotive actuators; providing precise motion control in office machinery like the paper feed rollers of printers and scanners; enabling smooth rotation in personal care appliances such as electric toothbrushes and facial cleansing brushes; and acting as a component in precision hobbyist tools and models, like RC car wheels and drone propellor hubs. Its role is often pivotal in minimizing friction and wear in confined spaces.

Technical Specifications and Requirements)
The 694 ZZ bearing is manufactured to international tolerance standards (typically ABEC 1 or equivalent, such as ISO Normal Class). Key technical specifications include: a dynamic load rating (Cr) of approximately 0.38 kN and a static load rating (Cor) of approximately 0.16 kN, defining its load-carrying limits. Its limiting speed is high for its size, often around 30,000 rpm or more when grease-lubricated. Material standards dictate chrome steel (GCr15/SAE 52100) for rings and balls, with optional stainless steel for corrosion resistance. The ZZ shields are press-fitted, creating a light contact seal. Proper installation requires clean handling, correct shaft and housing fits (avoiding excessive preload), and alignment. It is not suitable for applications requiring frequent relubrication or operating in submerged conditions.

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