Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MBC-19270-28502921 found under Seal Plain by Mueller Die Cut Solutions Inc. The National Stock Number assigned to this part is 5330016146992, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MBC-19270-28502921.