Online Parts Store › Phillips Machine Screw - Flat Head, 5/16"-18 x 2" Image 1 of 1 Phillips Machine Screw - Flat Head, 5/16"-18 x 2" $35.02 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #8 x 1/2" $13.86 Flat Washer, 5/16", .062" Thick, OD 9/16" (A/N Style) $10.20 Phillips Tapping Screw - Pan Head, #10 x 1" $29.03 Phillips Tapping Screw - Pan Head, #8 x 2" $19.02 Flat Washer, #12, .050" Thick, OD 1/2" $15.75