2-1/4", 14

US Fasteners, 2-1/4", 14
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.
Carriage bolts & Plow bolts Bolts with no drive and machine threads for use with a nut.	Socket screws Screws with an Allen wrench drive.
Set screws Screws with no head and machine threads for use in a tapped hole.	Eye bolts & Screw eyes Bolts or screws with a circular ring on the head.