Online Parts Store › Phillips Machine Screw - Oval Head, 5/16"-18 x 2-1/2" Image 1 of 1 Phillips Machine Screw - Oval Head, 5/16"-18 x 2-1/2" $20.09 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Square Tapping Screw - Oval Head #10 x 1-1/4" $57.05 Square Tapping Screw - Flat Head,#10 x 1-1/2" $62.54 Stainless Fender Washer 1/4", .062" Thick ,OD 1" $39.24 Phillips Self Drilling Screw - Pan Head #10 x 1-1/4" $37.54 Phillips Tapping Screw - Truss Head #10 x 3/4" $31.18