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What are machine screws?
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Material
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Machine screws are usually made of steel or brass.
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Application
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They are designed for use in metals and can only be used with a nut or in a tapped hole.
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Characteristics
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Head shape
Machine screws have a range of different head shapes including countersunk, round and truss.
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Drive type
They have a range of different drive types, but the most common is Phillips.
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Body shape and tip
Most machine screws have a straight body with a flat tip.
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Threads
Machine screws can be fully or partially-threaded. Their threads are usually fine and can be either single or twin/double.
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How are they inserted?
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They must be inserted into a tapped hole or they can be used with a nut.
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