Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F400K391 found under Gasket by Worthington Compressors Inc. The National Stock Number assigned to this part is 5330000256638, 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 F400K391.