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Hex washer head, US, 1", 18

US Fasteners, Hex washer head, 1", 18

Hex washer head self drilling

Sheet metal screws

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

Machine screws hex washer head

Machine screws

Screws with machine threads for use with a nut or in a tapped hole.