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Bearing guides

Short, practical answers to the questions engineers search for.

GuideIn short
How to calculate bearing life: L10, L10h and a worked exampleHow to calculate rolling bearing life: the L10 formula, hours at your speed, reliability factors and a worked example, plus typical target lives.
Why do bearings fail? The main causes and how to prevent themWhy bearings fail: lubrication, fatigue, contamination, mounting and electrical damage. How to identify each cause with ISO 15243 failure modes and prevent it.
How much grease does a bearing need, and how often?How much grease to put in a bearing: initial fill, the relubrication quantity formula, how temperature and speed change the interval, and the signs of over-greasing.
How to read a bearing number: designations explainedHow to read a bearing designation such as 6205-2RS C3 or 22212 E: the type digit, size series, bore code and the suffixes for seals, clearance and cage.