Ball bearing 6305 NR C3 KOYO 25x62x17

Snap ring groove for secure axial positioning

C3 internal clearance for higher temperature operation

Reliable solution for industrial drive systems

Main description

The 6305 NR C3 deep groove ball bearing from KOYO is a high-quality rolling bearing designed for demanding industrial applications where reliability, long service life, and stable operation are essential. With standard dimensions 25x62x17, this bearing belongs to the widely used 63 series, commonly installed in electric motors, pumps, fans, gear units, and general machinery.

The NR designation indicates a groove in the outer ring combined with a snap ring, allowing precise axial positioning of the bearing inside a bearing housing. This feature simplifies installation and ensures secure seating, especially in applications where the bearing is part of a complete bearing unit and axial movement must be controlled.

The C3 internal clearance provides increased radial clearance compared to standard CN bearings. This makes the 6305 NR C3 suitable for higher operating temperatures, increased rotational speeds, or tight interference fits on the shaft or in the housing. After thermal expansion during operation, the bearing maintains proper internal geometry, resulting in smooth running and high durability.

As a deep groove ball bearing, the 6305 NR C3 KOYO can accommodate primarily radial loads as well as moderate axial loads in both directions. Precision manufacturing and consistent quality ensure reliable performance in continuous-duty environments. For maintenance teams and OEM manufacturers, this bearing offers predictable behavior, long operating life, and compatibility with standard industrial housings and assemblies.

FAQ - frequently asked questions

What does NR mean in a 6305 bearing?
NR indicates a snap ring groove in the outer ring and a supplied snap ring for axial positioning in the housing.

When should a C3 clearance bearing be used?
When operating at higher temperatures, higher speeds, or with tight fits that reduce internal clearance during operation.

Is this bearing suitable for electric motors?
Yes, 6305 NR C3 bearings are commonly used in electric motors and rotating machinery.

What loads can the 6305 bearing handle?
Primarily radial loads, with moderate axial loads in both directions.

Can it be used in bearing housings or bearing units?
Yes, especially where secure axial positioning with a snap ring is required.