Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 3-1/2" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 3-1/2" $41.13 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Oval Head, #10 x 1-3/4" $26.77 Phillips Tapping Screw - Pan Head, #10 x 1" $29.03 Phillips Tapping Screws - Flat Head, #14 x 1-1/2" $28.97 Stainless Fender Washer #10, .062" Thick, OD 1" $48.06 Stainless Cotter Pin 1/8" x 1-1/4" $65.75