Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RBR56L20001TM found under Resistor Fixed Wire by Boeing Company The. The National Stock Number assigned to this part is 5905010154328, 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 RBR56L20001TM.