Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 541S503-2 found under Resistor Variable Wire Wound Non by Teledyne Technologies Inc. The National Stock Number assigned to this part is 5905008131746, 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 541S503-2.