Screw

:This article refers to the threaded fastener. For other meanings, see Screw (disambiguation).

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A screw is a shaft with a helical groove or thread formed on its surface. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force. It can also be defined as a inclined plane wrapped around a shaft.

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A screw used as a threaded fastener consists of a shaft, which may be cylindrical or conical, and a head. The shaft has a helical ridge or thread formed on it. The thread is essentially an inclined plane wrapped around a shaft. The thread mates with a complementary helix in the material. The material may be manufactured with the mating helix (tapped), or the screw may create it when first driven in (a self-tapping screw). The head is specially shaped to allow a screwdriver or wrench to grip the screw when driving it in. It also stops the screw from passing right through the material being fastened and provides compression.

Helical: REDIRECT Helix...

Thread: The word thread has many meanings:...

Fastener: A fastener is a hardware device that mechanically joins or affixes two or more objects together....

Screw related Images and Photos (experimental)

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