Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X201R503R found under Resistor Variable N by Cinch Connectors Ltd. The National Stock Number assigned to this part is 5905004834117, 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 X201R503R.