Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AN-50-864 REF NO. 4 found under Gasket Spiral Wound by Core Industries Inc. The National Stock Number assigned to this part is 5330015161677, 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 AN-50-864 REF NO. 4.