5/16-18X(3/4,7/8,2 1/4,2 3/4). 1/4-20X 7/8 Hex Head Screws Bolt Stainless Steel
Hex cap screws are partially threaded and provide much tighter tolerance than their fully threaded counterparts. Hex bolts are the most common construction fastener having a hex head that can be secured with a socket or wrench and mated with a nut or another internally threaded item.