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 Nylon Insert Locknut - Stainless 1/4-20 $27.84 Nylon Insert Locknut - Stainless 7/16-14 $21.10 Phillips Tapping Screws - Flat Head, #14 x 1-3/4" $36.21 Stainless Fender Washer #10, .062" Thick, OD 1" $48.06 Stainless Cotter Pin 3/32" x 3/4" $22.42