1-1/2", Zinc plated steel, US, 13

US Fasteners, 1-1/2", Zinc plated steel, 13
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.	Flange bolts Flange bolts have a flange on the bottom of the head that distributes the load like a washer.
Machine screws Screws with machine threads for use with a nut or in a tapped hole.	Carriage bolts & Plow bolts Bolts with no drive and machine threads for use with a nut.
Eye bolts & Screw eyes Bolts or screws with a circular ring on the head.