Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20 228521 501 found under Resistor Variable N by Lds Test And Measurement Llc. The National Stock Number assigned to this part is 5905001956285, 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 20 228521 501.