Differentiation between bolt and screw
A screw, by definition, is not a bolt. A bolt passes through a hole of larger diameter than its thread, and is held in place by a nut or similar device; it is not designed to be turned. What is often referred to as a bolt is in fact a 'cap screw', which is designed to be turned (or screwed). Cap screws may, or may not be used with nuts. The distinction is subtle, but significant in the design of the fastener. If threaded all the way to the back of the head a cap screw become a 'machine screw'.
Pic. showed kind of screws. There are 'cap screw' and 'machine screw' which I involved.
A Bolt set is showed real sizes and materials.
A screw set is showed real sizes and materials.
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