Online Parts Store › Phillips Machine Screw - Oval Head, 5/16"-18 x 3" Image 1 of 1 Phillips Machine Screw - Oval Head, 5/16"-18 x 3" $20.91 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Square Tapping Screw - Flat Head,#8 x 1-1/2" $31.67 Phillips Tapping Screw - Truss Head #10 x 3/4" $31.18 Square Tapping Screw - Flat Head,#8 x 1" $27.12 Flat Washer, 7/16", .062" Thick, OD 1-1/8" $27.80 Seachoice 01533 Hex Nut, 1/2-13 $66.78