Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KRL538-55.501 found under Resistor Fixed Wire Wound Nonind by Krl Electronics Inc. The National Stock Number assigned to this part is 5905011619194, 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 KRL538-55.501.