Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IR107-21R5 found under Resistor Fixed Wire by Inresco Inc. The National Stock Number assigned to this part is 5905012349643, 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 IR107-21R5.