Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X-201-RS504B found under Resistor Variable N by Cts Inc. The National Stock Number assigned to this part is 5905012706928, 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 X-201-RS504B.