(1 pc) extsw 21.05 mm ID x 38 mm OD x 4.77 mm thick 316 / A4 Alloy Stainless Washer
0.7mm Radius OD / Countersunk ID (no sharp edges)
21 mm ID x 37.84 mm OD x 4.77 mm Thick (+/- .076mm on all dimensions)
.828inch 1.490inch .188inch (+/- .003 on all dimensions)
Made in USA on a CNC lathe
It is a beautiful fit for your 20mm Stainless bolts
(Some other website will charge more for shipping than the washer cost)
USPS First Class Mail (2-9) business day delivery, depending on location.
(Usually delivered in 2-5 days)
All orders over $40.00 get FREE (2-3) Day Priority Mail
USPS (2-3) Day Priority Mail for $4.95 (unlimited weight)
Just contact me if you need a custom size washer.
316 Grade Alloy Stainless contain a higher percentage of nickel than 304SS. The resultant composition gives a much improved corrosion resistance in many aggressive environments. The molybdenum addition ensures more resistance to pitting and crevice corrosion in chloride-containing media, sea water and chemical environments such as sulfuric acid compounds, phosphoric and acetic acids. The lower rate of general corrosion in mildly corrosive environments gives 316 SS a good atmospheric corrosion resistance in polluted marine atmospheres.
316 SS offers good strength and creep resistance and also possesses excellent mechanical and corrosion-resistant properties at sub-zero temperatures.