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 Phillips Tapping Screw - Truss Head #8 x 1" $30.99 Flat Washer, 3/4", .109" Thick, OD 1-7/8" $47.99 Phillips Wood Screw - Flat Head, #8 x 3/4" $43.08 Phillips Tapping Screws - Flat Head, #14 x 3/4" $44.09 Carriage Bolt, 1/2"-13 x 5" $49.07