Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM-B-317091 found under Microphone Dynamic by Raytheon Company. The National Stock Number assigned to this part is 5965013240075, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SM-B-317091.