Online Parts Store › Square Tapping Screw - Flat Head,#10 x 1-1/2" Image 1 of 1 Square Tapping Screw - Flat Head,#10 x 1-1/2" $62.54 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Phillips Tapping Screws - Flat Head, #6 x 5/8" $9.57 Stainless Countersunk Finishing Washer, #10 $14.99 Phillips Tapping Screws - Oval Head, #12 x 1-1/2" $30.55 Tee Nut - Stainless 10-24 $37.98 Phillips Tapping Screw - Pan Head, #14 x 3" $61.60