Machine Design
When two non-intersecting and non-coplanar shafts are connected by gears, the arrangement is known as

Helical gearing
Bevel gearing
Spiral gearing
Spur gearing

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Machine Design
A tap bolt

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
Has pointed threads
Has both the ends threaded

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