Online Parts Store › Phillips Machine Screw - Flat Head, 3/8"-16 x 4" Image 1 of 1 Phillips Machine Screw - Flat Head, 3/8"-16 x 4" $47.17 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, 3/8", .062" Thick, OD 1" $40.34 Phillips Tapping Screw - Pan Head, #8 x 1-1/4" $27.71 Flat Washer, 5/16", .062" Thick, OD 7/8" $52.44 Stainless Countersunk Finishing Washer, #12 $18.89 Phillips Tapping Screw - Pan Head, #8 x 1/2" $13.86