Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SF6403 found under Heating Element Electrical Immer by Chromalox Corp. The National Stock Number assigned to this part is 2590002409267, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SF6403.