Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AP05C559-203 found under Resistor Variable Wire Wound Nonprecision by Ace Electronics Inc. The National Stock Number assigned to this part is 5905007241641, 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 AP05C559-203.