5/16-18 nut, zinc-plated (UNC thread). Used on Century, Vulcan, Chevron and Titan towing equipment, including the Century Series 10, Vulcan Series 10 and Chevron 14 Series.
Century Series 10 Gen 2 carrier part. 33" Aluminum Series 10 Toolbox - 377000 - Toolbox/Fuel Fill Mounting Brackets; 49" Aluminum Series 10 Toolbox - 378000 - Toolbox/Fuel Fill Mounting Brackets; 65" Aluminum Toolbox - 379000. Part number 83110.
