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 - Truss Head #10 x 1" $33.32 Stainless Countersunk Finishing Washer, #5/16 $22.42 Carriage Bolt, 1/2"-13 x 3" $92.78 Carriage Bolt, 1/2"-13 x 5" $49.07 Flat Washer, 1/4", .050" Thick, OD 11/16" $17.26