Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HM972-9SSM found under Filter High Pass by Spectrum Sei Microwave Inc. The National Stock Number assigned to this part is 5915015187164, 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 HM972-9SSM.