Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AE21-32H15 PIECE 203 found under Seal Plain Encased by Bethlehem Steel Corp. The National Stock Number assigned to this part is 5330012405980, 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 AE21-32H15 PIECE 203.