Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5M.3231.221.64 found under Washer Lock by Telefunken Radio. The National Stock Number assigned to this part is 5310121459279, 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 5M.3231.221.64.