Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B-34-431-B found under Amplifier Magnetic by Bae Systems Information And Electronic Systems Integration I. The National Stock Number assigned to this part is 5996000312828, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B-34-431-B.