Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1X40 found under Resistor Liquid Coo by Communications And Power Industries. The National Stock Number assigned to this part is 5905011042544, 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 1X40.