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Socket screws have an allen wrench drive.
The most common stainless steel for general hardware use.
A very high strength heat treated alloy steel. Black oil (plain) finish.
A low carbon steel for general use. Chrome plated and polished for a mirror like finish.
Zinc plated for moderate corrosion resistance.
Screws with no head and machine threads for use in a tapped hole.
Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.
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