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

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

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Machine Design
A tap bolt

Has both the ends threaded
Has pointed threads
Has a head on one end and a nut fitted to the other
Has head at one end and other end fits into a tapped hole in the other part to be joined

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