EXTSW 5/16" ID x 9/16" OD x 3/16" Thick 316 Stainless Washer

EXTSW 5/16” ID x 9/16” OD x 3/16” Thick 316 Alloy Stainless Washer

.030 inch Radius OD / Countersunk ID (no sharp edges)

Actual size .320 ID x .563 OD x .188 Thick 
(+/-.003 all dimensions)

Made in USA on a CNC lathe

It is a beautiful fit for your 5/16” Stainless bolts

We can make as many as you need, just contact me.


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.