Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U40-5040-2 found under Resistor Variable W by Raytheon Company. The National Stock Number assigned to this part is 5905002357823, 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 U40-5040-2.