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 Stainless Cotter Pin 1/8" x 1-1/2" $55.55 Phillips Tapping Screw - Pan Head, #8 x 3/8" $12.60 Phillips Self Drilling Screw - Pan Head #10 x 1-1/4" $37.54 Phillips Tapping Screws - Flat Head, #8 x 3/4" $12.91 Nylon Flat Washer #6, 0.32" Thick, OD 3/8" $17.45