Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17H28401-4 found under Insulation Blanket Thermal by Tighitco Inc. The National Stock Number assigned to this part is 5640011644338, and the Federal Supply Class is 5640 Wallboard Building Paper And Thermal Insulation Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17H28401-4.