Online Parts Store › Phillips Machine Screw - Oval Head, 5/16"-18 x 2" Image 1 of 1 Phillips Machine Screw - Oval Head, 5/16"-18 x 2" $45.66 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Nylon Insert Locknut - Stainless 1/2-13 $35.14 Phillips Tapping Screw - Pan Head, #10 x 1-3/4" $26.26 Nylon Insert Locknut - Stainless 1/4-20 $27.84 Phillips Tapping Screw - Truss Head #8 x 1/2" $18.52 Stainless Fender Washer #6, .050" Thick, OD 3/4" $19.71