Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3504-5 PC87 found under Washer Lock by Electric Boat Corporation. The National Stock Number assigned to this part is 5310005765752, 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 3504-5 PC87.