what are 5 facts on screw?

You don't need to use different screen names.

http://en.wikipedia.org/wiki/Screw

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To find five facts about screws, you could conduct research using reliable sources such as books, articles, or websites dedicated to engineering, hardware, or mechanical subjects. However, since you have asked me to provide the information, I can certainly offer you five facts about screws:

1. Screw Function: Screws are mechanical fasteners used to join or bind two or more components together. They create a strong, reliable connection by combining rotational force and axial force.

2. Basic Design: A screw consists of a threaded cylindrical shaft with a head at one end and a pointed tip called the "point" or "lead" at the other end. The thread wraps around the shaft from the point to the head, providing grip and facilitating the screwing action.

3. Thread Types: Screws can have different types of threads, including standard threads, fine threads, coarse threads, square threads, or specialized threads for specific applications. The thread type determines the characteristics of the screw's embedding strength, resistance to vibration, and ease of insertion.

4. Screw Head Types: Screws can have various head types, such as flat, round, oval, pan, or countersunk. Each head type serves a different purpose, such as preventing over-tightening, allowing flush mounting, or accommodating specific tools for driving or removal.

5. Applications: Screws have countless applications across various industries. They are used in construction, woodworking, metalworking, electronics, automobiles, machinery, and more. Screws are essential in assembling, repairing, and maintaining numerous objects and structures.

Remember, it's always best to verify these facts through research or consult reputable sources to ensure accuracy and obtain more detailed information about screws.