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SCREWS

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• Wood: The threads on wood screws usually are coarse and deep to help them grab the wood.
Wood screws are self-starting and have a pointed end, while metal screws have flat bottoms and are often mated to holes that have been previously threaded or tapped.

• Machine: Machine screws have finer threads than wood screws. They are designed to be used in conjunction with a nut or tapped hole.

• Sheet metal: These screws usually are short and have coarse threads that are designed to grab onto relatively thin sheet metal.

• High-low: These screws have two sets of threads with alternating heights. High-low screws are specifically designed for certain plastics and
other low-density materials.

• Self-tapping: Self-tapping or thread-forming screws feature threads that are designed to tap their own holes.
These work well in softer materials such as wood and plastic but are not suitable for harder materials.

welding screw
A screw with lugs or weld projections on the top or underside of the head to facilitate attaching the screw to a metal part by resistance welding.

Allen screws also are commonly known by two other names: hex screws and socket screws.
The most distinct part about an Allen screw is the hexagonal hole in the head that can only be loosened and tightened with an Allen/hex/socket wrench or key.
The various types of Allen screws are the hex-cap screw, socket-cap screw (ridged and smooth),
the socket flat-head screw, the socket button-head screw and the socket-set screw.

FINE THREADS

HIGH STRENGTH SCREWS

TAPPING

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