Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 4" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 4" $41.25 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #10 x 2-1/2" $37.66 Flat Washer, #6, .032" Thick, OD 3/8" $8.19 Seachoice 01008 Lock Washer, #12 $16.44 Flat Washer, 7/16", .062" Thick, OD 1-1/8" $27.80 Stainless Cotter Pin 1/8" x 1-1/4" $65.75