Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 3" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 3" $27.27 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Nylon Flat Washer #10, 0.32" Thick, OD 7/16" $17.32 Phillips Tapping Screw - Pan Head, #8 x 1" $21.73 Lock Washer, M4 $10.20 Stainless Fender Washer 1/4", .062" Thick ,OD 1" $39.24 Flat Washer, 1/2", .078" Thick, OD 1-3/8" $74.51