Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 439-20-0001-802 found under Lens Connector Fiber Optic by Siemens Building Technologies Inc. The National Stock Number assigned to this part is 6030016132502, and the Federal Supply Class is 6030 Fiber Optic Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 439-20-0001-802.