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, #10 x 1-1/2" $36.59 Stainless Countersunk Finishing Washer, #6 $13.10 Phillips Tapping Screw - Pan Head, #10 x 1/2" $21.73 Flat Washer, #12, .050" Thick, OD 1/2" $15.75 Stainless Cotter Pin 3/32" x 1-1/4" $54.48