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How to read bearing catalogs
Understand bearing codes, d/D/B dimensions, load ratings, limiting speed, sealing and cage information in catalogs.
A code is only the starting point
The same base code can have different clearance, sealing, cage or tolerance variants. Always read the code together with the technical values in the catalog row.
d, D and B dimensions
d is bore diameter, D is outside diameter and B is width. Shaft and housing tolerances must match these dimensions for reliable mounting.
Load and speed values
Dynamic and static load ratings support bearing life calculations. Limiting speed should be interpreted with lubrication, temperature and mounting conditions.
FAQ
What does d mean in a bearing catalog?
d is the bearing bore diameter and is usually checked against the shaft diameter.
Can the limiting speed always be used directly?
No. Lubrication, temperature, load and mounting conditions affect the practical speed limit.