Online Parts Store › Phillips Tapping Screws - Flat Head, #4 x 1/2" Image 1 of 1 Phillips Tapping Screws - Flat Head, #4 x 1/2" $10.20 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Square Tapping Screw - Flat Head,#10 x 1-1/2" $62.54 Lag Screw, 3/8 x 3" $41.46 Seachoice 01007 Lock Washer, #10 $10.77 Phillips Tapping Screw - Pan Head, #10 x 3/4" $32.06 Phillips Tapping Screws - Flat Head, #14 x 2-1/2" $57.69