Screw

These facts are screwed in.

A screw is generally a small tapered rod, with a thread, that is used to attach two or more items to each other, and it typically has a sharp pointed end to puncture the material it is being threaded into.
‘Screws’ are sometimes called ‘bolts’, although this term is somewhat inaccurate, as bolts usually require a nut, while the former, do not.
Screws have a flat or raised top, called a ‘head’, to prevent deep embedding and in some instances, to provide a decorative finish.
A screw is commonly used with a screwdriver or wrench to rotate it, so that it threads into the material, as well as to tighten it.
Screws typically are designed to fasten clockwise and have, what is called ‘a right handed thread’, although anticlockwise (left) fastening ones are available.

Screws were most likely invented before 300 BC, possibly by the legendary Archimedes, a Greek polymath, and early forms were generally made of wood and were often used as part of a press for wine or oil.
Screws are most commonly made of strong metal, typically steel, although noncorrosive materials are sometimes needed, so stainless steel, brass, and in some circumstances, plastic, is used.
Metal screws have only been popularly used since the late 1700s, and they were patented multiple times in the second half of the 1800s.
Screws can be used instead of nails, pins, rivets, glue, tape, welding and soldering.
Screws most commonly have a signal straight slot in the head, for a screwdriver, although the cross shaped slot in a Phillips head is also popular, and there are many other designs available, including square, hexagon and star shaped slots.

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