Online Parts Store › Phillips Machine Screw - Flat Head, 1/4"-20 x 3/4" Image 1 of 1 Phillips Machine Screw - Flat Head, 1/4"-20 x 3/4" $30.11 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Flat Washer, 3/8", .062" Thick, OD 5/8" (A/N Style) $11.46 Flat Washer, 1/2", .078" Thick, OD 1-1/4" $38.42 Lock Washer, M5 $10.83 Stainless Fender Washer #8, .050" Thick, OD 3/4" $21.67 Stainless Fender Washer 3/8", .078" Thick, OD 1-1/2" $54.73