Online Parts Store › Phillips Tapping Screws - Flat Head, #4 x 1" Image 1 of 1 Phillips Tapping Screws - Flat Head, #4 x 1" $14.93 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Seachoice 01007 Lock Washer, #10 $10.77 Square Tapping Screw - Flat Head,#12 x 2" $49.38 Flat Washer, 5/16", .062" Thick, OD 9/16" (A/N Style) $10.20 Nylon Insert Locknut - Stainless 1/4-20 $27.84 Flat Washer, 3/4", .109" Thick, OD 1-7/8" $47.99