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 Nylon Insert Locknut - Stainless 5/16-24 $46.35 Phillips Tapping Screw - Pan Head, #10 x 3/4" $32.06 Lock Washer, M4 $10.20 Phillips Wood Screw - Flat Head, #8 x 3/4" $43.08 Seachoice 01531 Hex Nut, 3/8-16 $30.68