Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 171-0004 ITEM NO. 20 found under Resistor Fixed Film by Cyberchron Corp. The National Stock Number assigned to this part is 5905014982712, 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 171-0004 ITEM NO. 20.