Online Parts Store › Flat Washer, #12, .050" Thick, OD 1/2" Image 1 of 1 Flat Washer, #12, .050" Thick, OD 1/2" $15.75 316 Stainless Steel. Add To Cart Added! 316 Stainless Steel. You Might Also Like Stainless Countersunk Finishing Washer, #10 $14.99 Nylon Insert Locknut - Stainless 5/8-11 $35.08 Stainless Cotter Pin 3/32" x 1-1/4" $54.48 Phillips Tapping Screw - Truss Head #8 x 1" $30.99 Phillips Self Drilling Screw - Pan Head #10 x 3/4" $36.40