Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 2-1/2" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 2-1/2" $25.89 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, 5/16", .062" Thick, OD 7/8" $21.67 Nylon Flat Washer 1/4", 0.56" Thick, OD 11/16" $24.88 Phillips Tapping Screw - Pan Head, #10 x 2" $24.88 Flat Washer, 3/4", .109" Thick, OD 1-7/8" $47.99 Phillips Self Drilling Screw - Pan Head #10 x 3/4" $36.40