Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DC539 found under Nut Plain Single Ball Seat Hexag by General Motors Corp. The National Stock Number assigned to this part is 5310002640542, 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 DC539.