Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 1-1/2" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 1-1/2" $31.36 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Oval Head, #12 x 2-1/2" $39.93 Phillips Tapping Screw - Truss Head #10 x 1" $33.32 Phillips Tapping Screw - Pan Head, #14 x 2" $45.91 Nylon Flat Washer 5/16", 0.62" Thick, OD 7/8" $37.54 Flat Washer, 7/16", .062" Thick, OD 1-1/8" $27.80