Overview Reviews Product Description Serrated nuts securely fasten into the surface to prevent loosening when vibrations are present. 18.8 stainless steel fasteners have excellent corrosion resistant qualities and are an excellent choice for general use and outdoor applications. Papco Nuts Catalog Product Videos Custom Field Box quantity 100 Diameter 5/16"-18 Product Reviews Write a Review Write a Review × Paulin 5/16"-18 UNC 18.8 Stainless Steel Hex Serrated Flange Nut 100 Pc. 5030-016 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *