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 Seachoice 18-8 Stainless Steel Wing Nuts, 1/4-20 Size, Pack of 100 $110.41 Phillips Tapping Screws - Flat Head, #14 x 2" $41.13 Flat Washer, 5/16", .062" Thick, OD 7/8" $21.67 Phillips Tapping Screw - Pan Head, #14 x 2" $45.91 Phillips Tapping Screw - Pan Head, #10 x 3" $37.54