Online Parts Store › Stainless Countersunk Finishing Washer, #5/16 Image 1 of 1 Stainless Countersunk Finishing Washer, #5/16 $22.42 18-8 Stainless Steel. Add To Cart Added! 18-8 Stainless Steel. You Might Also Like Stainless Cotter Pin 3/32" x 1-1/4" $54.48 Square Tapping Screw - Flat Head,#12 x 2" $49.38 Phillips Tapping Screws - Oval Head, #12 x 1-1/4" $22.30 Nylon Insert Locknut - Stainless 7/16-14 $21.10 Phillips Tapping Screw - Pan Head, #12 x 2" $30.36