How to identify a bearing number & measure a bearing

Read the whole designation

A bearing number is a starting point, not a complete application assessment. Photograph the markings before cleaning or removing a damaged component. Capture the brand and all letters or numbers around both faces, including suffixes.

Seals, shields and clearance

Suffix conventions differ between manufacturers. A sealing arrangement or clearance mark can change the replacement requirement even when the basic bearing number is similar. Do not treat different suffixes as equivalent without checking the manufacturer specification and your application.

Measure three dimensions

Record the bore (inside diameter), outside diameter and width in millimetres, preferably using suitable measuring tools. Supply the measurements in that order and state if a damaged part prevents an accurate reading. Housing dimensions or shaft size may also be needed for units and assemblies.

Check assemblies as well as the bearing

A tapered bearing may have separate cone and cup markings. A mounted unit has an insert and housing to identify. Some needle roller arrangements rely on the shaft as a raceway. Send all component markings rather than only the most visible code.

Prepare a useful enquiry

Include photographs, the machine, operating conditions, quantity and destination. Describe symptoms such as heat, noise or repeated failure; a replacement chosen only by size may not address the cause. Competent installation and manufacturer guidance remain important.

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More help

Bearing family references · Bearing number guide · Branch addresses and collection