Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 4" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 4" $41.25 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #10 x 3/4" $32.06 Phillips Tapping Screw - Truss Head #10 x 1-1/4" $50.76 Phillips Tapping Screws - Flat Head, #4 x 3/4" $13.73 Phillips Tapping Screws - Flat Head, #14 x 3/4" $44.09 Square Tapping Screw - Flat Head,#10 x 1-1/4" $48.20