Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 609-4676623 ITEM 53 found under Washer Flat by R Way Gasket And Supply Company Inc. The National Stock Number assigned to this part is 5310011153434, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 609-4676623 ITEM 53.