Machine Design
A tap bolt

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

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being less than unity
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Radial load only

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