Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 3" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 3" $27.27 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Nylon Flat Washer #8, 0.32" Thick, OD 3/8" $16.50 Stainless Countersunk Finishing Washer, #12 $18.89 Stainless Countersunk Finishing Washer, #1/4 $21.92 Blind Rivet, 1/8" x 1/2" $71.23 Lock Washer, M5 $10.83