Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 2-1/2" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 2-1/2" $25.89 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #8 x 2" $19.02 Stainless Countersunk Finishing Washer, #4 $13.29 Stainless Cotter Pin $147.38 Carriage Bolt, 1/2"-13 x 3" $92.78 Phillips Tapping Screws - Oval Head, #10 x 3/4" $23.24