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 Phillips Tapping Screw - Truss Head #10 x 1-1/4" $50.76 Phillips Tapping Screw - Truss Head #8 x 3/4" $17.19 Square Tapping Screw - Oval Head #8 x 3/4" $25.25 Flat Washer, 5/8", .078" Thick, OD 1-1/2" $22.42 Carriage Bolt, 1/2"-13 x 4" $109.86