US, #4 x 1-1/2"

US Fasteners, #4 x 1-1/2"
Wood screws Screws with a smooth shank and tapered point for use in 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.
Machine screws Screws with machine threads for use with a nut or in a tapped hole.	Socket screws Screws with an Allen wrench drive.