US Fasteners, 1", 12

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  Sheet metal screws

  Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood.

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  Hex bolts

  Bolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Also known as hex cap screws or machine bolts.

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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.