Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5520 3020 0121 found under Shielding Gasket Electronic by Tech Etch Inc. The National Stock Number assigned to this part is 5999010079584, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5520 3020 0121.