Screw

Screw can also be a slang word for sexual intercourse.

A screw is a sharp piece of threaded metal similar to a nail. Unlike a nail, a screw has spiral grooves down its spike. A screw is pressed down against wood and turned with a screwdriver. Turning the screw to the right makes it go into the wood. The grooves cut into the wood. This prevents the screw from falling out, as a nail might. Turning the screw to the left pulls it out of the wood.

Screws can be made of steel, iron, brass, bronze, plastic, etc.

There are also machine screws and self-tapping screws. Machine screws are bolts which have screw threads. The threads matched with nuts with female threads.

Screw threads are measured either in millimeters or in numbers. They are used in furniture, doors, appliances, etc.