Crown Bolt 30872 1/4 Inch-20 x 1-1/4 Inch Round-Head Combo Zinc-Plated Machine Screws, 50-Count Zinc-plated 1/4 inch-20 x 1-1/4 inch machine screws round head combo For general applications 1/4 inch-20 body diameter and thread pitch 1-1/4-inch fastener length Use with bolt of the same diameter, thread pitch, grade, and finish