Sealed antifriction bearings typically do not need additional lubrication for how many years?

Sealed antifriction bearings are designed to be low-maintenance, thanks to the way they are manufactured. A key feature of these bearings is that they come pre-lubricated with grease, which is sealed within the bearing's housing. This design prevents the ingress of contaminants and minimizes the loss of lubrication over time.

Typically, sealed antifriction bearings can operate effectively without the need for additional lubrication for up to three years under normal conditions. This timeframe is based on various factors, including operating temperatures, environmental conditions, and the specific design and materials used in the bearing. After this period, while the grease may still be sufficient for function, it could degrade, leading to reduced performance and increased wear.

The other timeframes listed do not reflect the typical maintenance schedule for sealed antifriction bearings. One year may be too soon to require maintenance, while five years usually exceeds the optimal service life for the grease used in most sealed bearings. Hence, three years is recognized as a standard duration in which additional lubrication is generally not necessary.