Online Parts Store › Phillips Machine Screw - Oval Head, 5/16"-18 x 4" Image 1 of 1 Phillips Machine Screw - Oval Head, 5/16"-18 x 4" $34.64 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Wood Screw - Flat Head, #8 x 3/4" $43.08 Phillips Tapping Screws - Flat Head, #8 x 1/2" $12.41 Phillips Tapping Screw - Pan Head, #8 x 1-1/4" $27.71 Phillips Tapping Screws - Flat Head, #14 x 1-1/2" $28.97 Phillips Tapping Screw - Pan Head, #14 x 1" $55.11