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 Screw - Truss Head #8 x 1/2" $18.52 Stainless Countersunk Finishing Washer, #4 $13.29 Phillips Tapping Screws - Oval Head, #10 x 1" $27.33 Phillips Tapping Screw - Pan Head, #8 x 1-1/4" $27.71 Stainless Countersunk Finishing Washer, #1/4 $21.92