The "687" bearing is a miniature deep groove ball bearing commonly utilized in various applications. Here is a detailed introduction:

Size: The dimensions of the 687 bearing are typically specified as follows:

Inner Diameter (ID): [Specific measurement] (e.g., 7mm)

Outer Diameter (OD): [Specific measurement] (e.g., 14mm)

Width: [Specific measurement] (e.g., 3.5mm)

These dimensions define the physical size of the bearing, allowing it to be fitted into applications with space constraints.

Structure: The 687 bearing is a type of deep groove ball bearing, featuring an inner and outer ring, a set of steel balls, and a cage to maintain ball separation. This design enables the bearing to accommodate both radial and axial loads.

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

Applications: Due to its miniature size, the 687 bearing is commonly used in small-scale precision machinery, electronic devices, and various consumer products where compact dimensions are essential.

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 like rotational accuracy and smoothness.

In summary, the 687 bearing is a small-sized deep groove ball bearing suitable for applications where space is limited. Its dimensions, structural design, and material composition make it versatile for use in a range of miniature and precision devices. For precise technical details, it is advisable to refer to the manufacturer's specifications for the specific model of the 687 bearing.