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 Flat Washer, 5/16", .062" Thick, OD 7/8" $52.44 Phillips Tapping Screw - Truss Head #8 x 1/2" $18.52 Nylon Insert Locknut - Stainless 12-24 $75.96 Seachoice 01006 Lock Washer, #8 $15.43 Seachoice 01008 Lock Washer, #12 $16.44