Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CK1640P31 found under Electron Tube by Raytheon Company. The National Stock Number assigned to this part is 5960001941462, 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 CK1640P31.