Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CF1 21 6M5 found under Resistor Fixed Film by Koa Speer Electronics Inc. The National Stock Number assigned to this part is 5905011869251, 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 CF1 21 6M5.