Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KLN-6239B-457.9HZ found under Filter Radio Freque by Freescale Semiconductor. The National Stock Number assigned to this part is 5915011098876, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KLN-6239B-457.9HZ.