Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 250-640 found under Gasket A12x18cu by Bombardier Aerospace. The National Stock Number assigned to this part is 5330015311408, 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 250-640.