Koyo KOYO6209-ZZC3 Deep Groove Ball Bearing Steel

Product Description

The KOYO KOYO6209-ZZC3 is a deep groove ball bearing designed for moderate radial and low axial load applications. It features double metal shields (ZZ designation) that protect internal components from contamination while retaining grease for extended service life. Built from high carbon, high chromium steel with a riveted cage, this bearing carries a C3 internal clearance rating, meaning it has greater-than-normal radial clearance. That clearance is suited for applications where thermal expansion or shaft fit conditions require additional running room. Licensed electricians, millwrights, HVAC technicians, and pump service professionals regularly install bearings of this type across rotating equipment platforms.

This bearing is appropriate for residential and light commercial equipment including electric motors, fans, blowers, pumps, and conveyor drives. The double shield configuration makes it a practical choice for moderate-speed applications where full sealing is not required but basic contamination protection is needed. The C3 clearance grade is commonly specified in applications with press fits or elevated operating temperatures where a standard clearance bearing would run too tight.

Key Features

• Double metal shields (ZZ) provide contamination protection without full-contact seal drag
• C3 radial internal clearance rated greater than normal for thermal and fit tolerance applications
• High carbon, high chromium steel construction for durability under radial load cycles
• Riveted cage design maintains consistent ball spacing under operating conditions
• Standard ABEC 1 precision level suitable for general industrial and HVAC equipment
• No preload — free-running fit appropriate for moderate radial load scenarios

Compatibility

Designed as an OEM-style replacement deep groove ball bearing for electric motors, blower assemblies, pumps, and similar rotating equipment requiring a 1.77 inch bore diameter with double metal shields and C3 clearance.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or HVAC technician. De-energize and lock out all power to the equipment before removing the worn bearing. Use a proper bearing press or installation sleeve to apply force to the correct bearing race — never strike the bearing directly with a hammer. Verify shaft and housing fits are within specification before pressing the new bearing into place.

Technical Specifications

• Bore Diameter: 1.77 inches
• Bearing Type: Deep Groove Ball Bearing
• Bearing Material: Steel
• Cage Type: Riveted
• Shield Type: Double Metal Shield (ZZ)
• Seal Material: Metal
• Radial Internal Clearance: C3 — Greater Than Normal
• Precision Level: Standard (ABEC 1)
• Preload Level: None

Standard Information

• Brand: KOYO
• Manufacturer Part Number: KOYO6209-ZZC3