Koyo KOYO6305-2RDC3 Ball Bearing C3 Light Contact Seal

Product Description

The KOYO KOYO6305-2RDC3 is a single-row deep-groove ball bearing designed for rotating shaft and housing applications across HVAC, motor, and industrial equipment. It features a 25mm bore, 62mm outer diameter, and 17mm width, conforming to standard 6305-series dimensional tolerances. The light contact seal (2RD) retains grease and excludes contaminants while generating less frictional drag than a full-contact seal, making it well-suited for moderate-speed applications. The C3 internal clearance rating provides a looser-than-standard radial play, accommodating shaft and housing interference fits and thermal expansion during operation.

This bearing is used in electric motors, fan assemblies, blower housings, pump shafts, and similar rotating equipment found in residential and commercial HVAC systems as well as general mechanical applications. It is appropriate where operating temperatures or press-fit conditions call for increased internal clearance beyond the standard CN designation. Licensed HVAC technicians, motor rewinders, and mechanical service technicians typically install this bearing during motor shaft rebuilds or bearing replacement service calls.

Key Features

• 25mm bore x 62mm OD x 17mm width — standard 6305-series dimensional envelope
• C3 clearance rating accommodates thermal expansion and interference-fit installations
• Light contact seal (2RD) reduces running torque compared to full-contact sealed bearings
• Grease-lubricated and sealed on both sides for maintenance-free service
• Deep-groove raceway design handles both radial and moderate axial loads

Compatibility

Designed as a direct replacement for standard 6305-2RDC3 series deep-groove ball bearings used in electric motors, blower assemblies, and pump shafts requiring a 25mm bore and C3 internal clearance.

Installation Notes

This bearing should be installed by a qualified technician familiar with motor and rotating equipment service. De-energize and lock out the equipment completely before removing the old bearing. Use a bearing press or proper puller tools to seat and remove bearings — never drive them with a hammer directly against the outer or inner race. Follow applicable equipment manufacturer guidelines for housing tolerances and shaft fits when selecting an interference or slip fit.

Technical Specifications

• Bore Diameter: 25mm
• Outer Diameter: 62mm
• Width: 17mm
• Bearing Series: 6305
• Seal Type: Light Contact Seal (2RD), both sides
• Internal Clearance: C3
• Bearing Type: Single-Row Deep-Groove Ball Bearing

Standard Information

• Brand: KOYO
• Manufacturer Part Number: KOYO6305-2RDC3