Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NSP-00257-XF91MO15M found under Seal Assembly by John Crane Inc. The National Stock Number assigned to this part is 5330010063709, 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 NSP-00257-XF91MO15M.