Koyo KOYO6312-2RDC3 Deep Groove Ball Bearing C3

Product Description

The KOYO KOYO6312-2RDC3 is a deep groove ball bearing designed for rotating shaft applications in HVAC equipment, motors, pumps, and industrial machinery. It features a 60 mm bore, 130 mm outer diameter, and 31 mm width. The bearing uses light contact seals on both sides to retain grease while limiting friction-generating drag. C3 internal clearance provides extra radial play, making it well suited for applications where the shaft or housing runs at elevated temperatures or where press-fit mounting reduces internal clearance. Licensed HVAC technicians, pump service technicians, and millwrights are the typical installers.

This bearing sees common use in belt-drive and direct-drive HVAC blower motors, circulator pumps, fan shaft assemblies, and light industrial equipment where moderate radial loads and moderate-to-high speeds are expected. The low-torque light contact seal design reduces parasitic drag compared to heavy-contact or rubberized full-contact seals, which is an advantage in variable-speed motor applications and energy-sensitive installations.

Key Features

• 60 mm bore x 130 mm outer diameter x 31 mm width — standard 6312 series envelope
• Double-sided light contact seals (2RD) retain lubrication while minimizing frictional drag
• C3 internal clearance for use in applications with elevated operating temperatures or interference-fit mounting
• Low-torque design reduces parasitic load on motors and drive systems
• Pre-greased and sealed — no field lubrication required at installation

Compatibility

Designed as an OEM-style replacement bearing for motors, pumps, blowers, and rotating equipment requiring a standard 6312-series deep groove ball bearing with C3 clearance and double light contact seals.

Installation Notes

Installation should be performed by a qualified technician. De-energize and lock out the equipment before removing the old bearing. Use a proper bearing press or hydraulic puller to seat or remove the bearing — never strike the outer or inner race directly with a hammer, as this damages the raceways and rolling elements. Consult equipment manufacturer torque specifications for housing fasteners and verify shaft and housing fit tolerances before installation.