Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 1-1/2" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 1-1/2" $31.36 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #8 x 3/8" $12.60 Phillips Tapping Screw - Pan Head, #14 x 3/4" $49.38 Nylon Insert Locknut - Stainless 1/2-13 $35.14 Flat Washer, 5/16", .062" Thick, OD 7/8" $52.44 Nylon Flat Washer 1/2", 0.62" Thick, OD 1-1/4" $36.72