US, 3/8" x 1-1/4", Hex washer head
US Fasteners, 3/8" x 1-1/4", Hex washer head |
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Sheet metal screwsScrews with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood. |
Machine screwsScrews with machine threads for use with a nut or in a tapped hole. |