The "688" bearing is a miniature deep groove ball bearing commonly employed in various applications. Here is a detailed introduction:

Size: The dimensions of the 688 bearing are typically specified as follows:

Inner Diameter (ID): [Specific measurement] (e.g., 8mm)

Outer Diameter (OD): [Specific measurement] (e.g., 16mm)

Width: [Specific measurement] (e.g., 4mm)

These dimensions define the physical size of the bearing, making it suitable for applications with limited space.

Structure: The 688 bearing is a type of deep groove ball bearing, characterized by an inner and outer ring, a set of steel balls, and a cage for ball retention. This design allows the bearing to handle both radial and axial loads.

Material: Typically, the inner and outer rings, as well as the balls, are crafted from high-quality steel, providing durability and resistance to wear.

Applications: Due to its small size, the 688 bearing is commonly used in precision machinery, electronic devices, and other applications where space constraints are critical. It is particularly suitable for small motors, household appliances, and various consumer products.

Precision Level: Bearings may be assigned an industry-standard precision rating, such as the ABEC (Annular Bearing Engineers' Committee) scale. The ABEC scale ranges from ABEC-1 (lower precision) to ABEC-9 (higher precision), reflecting manufacturing tolerances. The specific ABEC rating can impact factors such as rotational accuracy and smoothness.

In summary, the 688 bearing is a miniature deep groove ball bearing designed for applications where compact dimensions are essential. Its small size, structural design, and material composition make it versatile for use in a range of precision devices. For precise technical details, it is recommended to refer to the manufacturer's specifications for the specific model of the 688 bearing.