Flange Dia. .687", Head Width .312", Head Height 21/64", Fully Threaded, Head height includes the flange. Length is measured from under the flange. Grade 8 Zinc Steel Serrated Flange Bolts R, FT 5/16"-18 x 1.75" Length

Flange Dia. .687", Head Width .312", Head Height 21/64", Fully Threaded, Head height includes the flange. Length is measured from under the flange.