Home Hardware & Fasteners Machine Screws Phillips Head Machine Screws – Flat Head (1/4-20 x 1-1/2”) Marine Fasteners Inc Phillips Head Machine Screws – Flat Head (1/4-20 x 1-1/2”) $19.89 Phillips Head Machine Screws – Flat Head (1/4-20 x 1-1/2”) quantity Add to cart Product Details Product Details 1/4-20 x 1-1/2″. Stainless steel. Sold in boxes of 50.