Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XBP12 173 91 21 5MM found under Filter Band Pass by Filtek. The National Stock Number assigned to this part is 5915013327433, 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 XBP12 173 91 21 5MM.