Online Parts Store › Phillips Machine Screw - Oval Head, 1/4"-20 x 3-1/2" Image 1 of 1 Phillips Machine Screw - Oval Head, 1/4"-20 x 3-1/2" $50.70 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #10 x 2-1/2" $37.66 Phillips Tapping Screw - Pan Head, #8 x 2" $19.02 Carriage Bolt, 1/2"-13 x 4" $109.86 Nylon Flat Washer #10, 0.32" Thick, OD 7/16" $17.32 Flat Washer, 5/16", .062" Thick, OD 9/16" (A/N Style) $10.20