US Fasteners, 1/2", Stainless steel, Allen, 40

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  Socket screws

  Screws with an Allen wrench drive.

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  Set screws

  Screws with no head and machine threads for use in a tapped hole.

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  Shoulder bolts

  Screws with an unthreaded shoulder that is larger in diameter than the threads. Also known as stripper bolts.