Hillman 9 16 in. Zinc Dichromate Steel USS Hex Nut, Coarse Thread, Grade 8 (50 Pack) Modero Collection Specification Details Diameter 3 8 inch Item Weight:.625 Specification Details Diameter 3 8 inch Length 4 1 2 inch Material Steel Grade Grade 8 Finish Heat treated (yellow dichromate style) Head Type Hex head with washer face Thread Type Coarse Threading Partially threaded shank Package Quantity 50 pack Packaging Boxed Intended Use Use with a nut or in a tapped hole Specification Details Color Finish Family Black and white Manufacturer Color Finish Black and White (Biscotto pattern) Actual Length (Inches) 12 Actual Width (Inches) 12 Tile Size 12 in x 12 in Actual Thickness (Millimeters) 1 Q: What bolt size do these nuts fit Q: Do I need matching washers bolts