Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T55H40.5-SER. NO.16286 found under Oven Thermal Drying Electric by Gruenberg Oven Company. The National Stock Number assigned to this part is 4430014110688, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like T55H40.5-SER. NO.16286.