5/16" x 1-1/4", US, Steel, Hex head

US Fasteners, 5/16" x 1-1/4", Steel, Hex head
Sheet metal screws Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood.	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.
Lag bolts Large wood screws technically called lag screws.