5/16″-18 Polished 18-8 Stainless Steel Coarse Thread Acorn Nuts (6 pcs.)
Diameter: 5/16″ Diameter 2: 9/16″ Thickness: 3/4″ Material: Stainless Steel Finish: Polished Driver Type: 1/2″ Wrench Thread Size: 18 (Coarse) Shape: High Crown Acorn Hardness: 18-8 Type: Cap Nut Box of 6. A closed nut having a dome-like cap over the back, protruding part of the engaged screw or bolt. Also called an acorn nut.