Crown Bolt 30932 1/4 Inch-20 x 3 Inch Flat-Head Phillips Zinc-Plated Machine Screws, 25-Count Zinc-plated 1/4 inch-20 x 3 inch machine screws flat head Phillips For general applications 1/4 inch-20 body diameter and thread pitch 3-inch fastener length Use with bolt of the same diameter, thread pitch, grade, and finish