Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 3" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 3" $27.27 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Flat Head, #8 x 1-1/4" $19.34 Phillips Tapping Screw - Pan Head, #10 x 1-1/2" $36.40 Nylon Insert Locknut - Stainless 7/16-14 $21.10 Stainless Fender Washer #10, .050" Thick, OD 3/4" $18.58 Phillips Tapping Screw - Pan Head, #14 x 1-1/2" $37.79