Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BLA-031 found under Electron Tube by Cpi International Inc. The National Stock Number assigned to this part is 5960006889031, 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 BLA-031.