FLAT WASHER SS 5/8"

Fasco Fastener 5/8" D X 1 1/2" OD Stainless Steel Flat Washer, 100-Pack. Either 18-8 stainess steel or 316 stainless steel. The way to tell the difference is that the 316 washers have a four digit FASCO# preceded by a "3" for a total of 5 digits, except for sku 5375837, which is 18-8. FASCO numbers that do not adhere to the above described format are 18-8 stainless steel.