Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 128-0056-001 found under Fastener Assembly by Boeing Company The. The National Stock Number assigned to this part is 5325010053956, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 128-0056-001.