Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X31-5439SUB8GP2 found under Visor Cathode Ray T by Raytheon Company. The National Stock Number assigned to this part is 5960006438160, and the Federal Supply Class is 5960 Electron Tubes And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like X31-5439SUB8GP2.