Crown Bolt 30942 1/4 Inch-20 x 3-1/2 Inch Flat-Head Phillips Zinc-Plated Machine Screws, 20-Count Zinc-plated 1/4 inch-20 x 3-1/2 inch machine screws flat head Phillips For general applications 1/4 inch-20 body diameter and thread pitch 3-1/2-inch fastener length Use with bolt of the same diameter, thread pitch, grade, and finish