Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BY350-5-420-550A found under Resistor Variable H by Raytheon Company. The National Stock Number assigned to this part is 5905015633347, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BY350-5-420-550A.