Serrated Flanged Hexagonal Nut Zinc Plated 5/16-18 Grade 5

These flange locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance. The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. Made from Grade 5 steel, they'resuitable for fastening most machinery and equipment. The nuts have a thread of 5/16-18. A Zinc-plated steel provides corrosion resistance in wet environments. Height includes the flange.