Difference between a bolt, a screw and a stud?

Difference between a bolt, a screw and a stud?

A bolt is a threaded fastener mated with a nut. A screw has either pre-formed or self-made external threads. A stud is an externally threaded headless fastener. One end mates with a tapped component and the other with a standard nut

A bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut.

A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, or mating with a preformed internal thread or forming its own thread, and of being tightened or released by torquing the head.

A bolt with threads on both ends, to be screwed permanently into a fixed part at one end and receive a nut upon the other; – called also standing bolt or stud

This is the difference between bolt screw and stud.