Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Light series whose bore is 5 mm
Medium series whose bore is 5 mm
Light series whose bore is 25 mm
Medium series whose bore is 25 mm

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film pressure is generated only by the rotation of the journal
Grease required to be applied after some intervals
The oil film is maintained by supplying oil under pressure

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