Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21101 found under Seal Plain Encased by Applied Industrial Technologies. The National Stock Number assigned to this part is 5330010679691, 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 21101.