Online Parts Store › Stainless Countersunk Finishing Washer, #4 Image 1 of 1 Stainless Countersunk Finishing Washer, #4 $13.29 316 Stainless Steel. Add To Cart Added! 316 Stainless Steel. You Might Also Like Flat Washer, 5/8", .078" Thick, OD 1-1/2" $22.42 Phillips Tapping Screw - Pan Head, #12 x 2" $30.36 Phillips Tapping Screws - Oval Head, #12 x 2-1/2" $39.93 Nylon Flat Washer 1/4", 0.56" Thick, OD 11/16" $24.88 Flat Washer, #6, .032" Thick, OD 3/8" $8.19