Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number APT01238 found under Insulation Sleeving Thermal by Armacell Llc. The National Stock Number assigned to this part is 5640015277731, 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 APT01238.