Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DN500WITHSTAND found under Microphone Dynamic by Astatic Corp The. The National Stock Number assigned to this part is 5965001704793, 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 DN500WITHSTAND.