What is a screw?
Q: What is a screw?
A: A screw is a sharp piece of threaded metal similar to a nail with spiral grooves down its spike.
Q: How is a screw used?
A: A screw is pressed down against wood and turned with a screwdriver. Turning the screw to the right makes it go into the wood, and turning the screw to the left pulls it out of the wood.
Q: What prevents a screw from falling out of wood?
A: The grooves cut into the wood prevent the screw from falling out, as a nail might.
Q: What materials can screws be made of?
A: Screws can be made of steel, iron, brass, bronze, plastic, etc.
Q: What are machine screws?
A: Machine screws are bolts which have screw threads, and the threads matched with nuts with female threads.
Q: How are screw threads measured?
A: Screw threads are measured either in millimeters or in numbers.
Q: Where are screws commonly used?
A: Screws are commonly used in furniture, doors, appliances, etc.
