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 Phillips Tapping Screws - Flat Head, #6 x 3/4" $10.33 Stainless Countersunk Finishing Washer, #5/16 $22.42 Phillips Tapping Screws - Flat Head, #14 x 2-1/2" $57.69 Phillips Tapping Screw - Pan Head, #10 x 1" $29.03 Square Tapping Screw - Oval Head #10 x 1-1/2" $35.29