Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X8IB40 542 5 57 PX PX found under Filter Band Pass by K And L Microwave Inc. The National Stock Number assigned to this part is 5915012738794, 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 X8IB40 542 5 57 PX PX.