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Socket screws have an allen wrench drive.
Socket caps have a small cylindrical head with tall vertical sides. Allen drives are six sided recesses for use with an allen wrench.
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.
Flat heads are countersunk (cone shaped under the head) with a flat top. Allen drives are six sided recesses for use with an allen wrench.
Zinc plated for moderate corrosion resistance.
Button heads are rounded and low profile. Allen drives are six sided recesses for use with an allen wrench.
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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