1-5/16", US

US Fasteners, 1-5/16"
Socket screws Screws with an Allen wrench drive.	Nuts Nuts have internal machine threads, for use with machine thread bolts and screws.
Eye bolts & Screw eyes Bolts or screws with a circular ring on the head.	Pins & Clips Pins and clips are used to secure or align fasteners or parts on machinery.