Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4309R-101-821LF found under Resistance Element by Bourns Inc. The National Stock Number assigned to this part is 5905016656666, 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 4309R-101-821LF.