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 Square Tapping Screw - Flat Head,#10 x 1-1/2" $62.54 Stainless Cotter Pin 3/32" x 1-1/2" $56.56 Seachoice 01007 Lock Washer, #10 $10.77 Phillips Tapping Screws - Flat Head, #14 x 2" $41.13 Phillips Tapping Screws - Oval Head, #10 x 1-3/4" $26.77