Online Parts Store › Flat Washer, #10, .050" Thick, OD 9/16 Image 1 of 1 Flat Washer, #10, .050" Thick, OD 9/16 $16.12 316 Stainless Steel. Add To Cart Added! 316 Stainless Steel. You Might Also Like Phillips Tapping Screw - Pan Head, #10 x 1-1/4" $32.56 Phillips Tapping Screws - Oval Head, #10 x 1-3/4" $26.77 Square Tapping Screw - Flat Head,#8 x 1-1/4" $28.68 Nylon Insert Locknut - Stainless 1/4-20 $27.84 Tee Nut - Stainless 10-24 $37.98