Online Parts Store › Stainless Countersunk Finishing Washer, #1/4 Image 1 of 1 Stainless Countersunk Finishing Washer, #1/4 $21.92 316 Stainless Steel. Add To Cart Added! 316 Stainless Steel. You Might Also Like Flat Washer, #10, .050" Thick, OD 9/16 $16.12 Seachoice 18-8 Stainless Steel Wing Nuts, 1/4-20 Size, Pack of 100 $110.41 Square Tapping Screw - Flat Head,#10 x 2" $31.61 Phillips Tapping Screw - Pan Head, #12 x 1-1/4" $23.49 Seachoice 01011 Lock Washer ,5/16" $31.68