Online Parts Store › Phillips Machine Screw - Oval Head, 5/16"-18 x 1-1/2" Image 1 of 1 Phillips Machine Screw - Oval Head, 5/16"-18 x 1-1/2" $31.36 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Square Tapping Screw - Flat Head,#12 x 2" $49.38 Stainless Cotter Pin 1/8" x 2" $18.81 Flat Washer, 1/4", .050" Thick, OD 11/16" $17.26 Phillips Tapping Screw - Pan Head, #12 x 1-1/4" $23.49 Phillips Tapping Screws - Flat Head, #6 x 1-1/2" $16.94