Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS40-5 found under Harness Microphone by Plantronicsinc. The National Stock Number assigned to this part is 5965003145303, 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 MS40-5.