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, #12 x 1-1/4" $23.49 Phillips Tapping Screw - Pan Head, #14 x 1" $55.11 Phillips Tapping Screw - Truss Head #10 x 1-1/4" $50.76 Nylon Insert Locknut - Stainless 7/16-14 $21.10 Stainless Countersunk Finishing Washer, #12 $18.89