689-2RS-C3 PFI Deep Groove Ball Bearing Sealed C3 Clearance (ID 9mm OD 7mm W 5mm)

The PFI 680 series Deep Groove Ball Bearing is a precision-engineered component designed for efficient rotation and reliable load handling in various mechanical assemblies. Manufactured to exact tolerances, it provides consistent performance and extended operating life in both industrial and automotive applications. Its construction supports stable running characteristics under moderate radial and axial loads, making it suitable for high-speed environments and compact housings.

Product Overview

The 680 series belongs to PFI’s range of thin-section deep groove ball bearings, characterised by smaller cross-sectional dimensions relative to bore size. This design offers space-saving advantages while maintaining load-carrying capacity. The bearings are produced with quality materials and tight dimensional control, ensuring smooth operation, low noise, and balanced internal geometry across all standard sizes in the series.

Design Features

Each bearing within the 680 series utilises hardened steel rings and precision-matched balls for uniform load distribution and reduced friction. The internal raceway geometry is optimised to minimise contact stress and heat generation during continuous operation. Depending on the variant, the bearings can be supplied open or fitted with shields or seals to retain lubricant and exclude contaminants. Bearing cages are manufactured from metal or polymer materials selected for durability and stable guidance of rolling elements under varying speeds and loads.

Functional Characteristics

PFI 680 series bearings exhibit high rotational accuracy and low running torque, allowing for efficient energy transfer in demanding assemblies. The balanced design supports both radial and limited axial loads in either direction, maintaining alignment within the housing and shaft assembly. The use of precision ball and raceway finishing processes also reduces vibration, ensuring reliability in applications requiring quiet and consistent performance.

Use in Assemblies

This bearing series is commonly employed in applications where compact bearing envelopes and low rotational resistance are critical, such as small electric motors, pumps, measuring instruments, and transmission systems. The minimal cross-section facilitates use in lightweight or space-limited assemblies while maintaining consistent performance under operational load conditions. Proper installation and lubrication further enhance its service life and operational stability within mechanical systems.