304 and 316 A4-80 Stainless Steel Washers have a place in the classification of the greatest rigidity property class, though the elastic property class for A4-70 washers is lower than that of grade A4-80. While the 316 Stainless Steel Square Washers may not be normal in shape, these washers carry out the expected role by equally conveying the heap across, like the traditionally used plate-formed washers.