Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MIL263421A found under Seal Nonmetallic Special Shaped by Airgas Usa Llc. The National Stock Number assigned to this part is 5330016676209, 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 MIL263421A.