Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T55H40-5 SYMBOL C2 found under Control Temperature Indicating by Gruenberg Oven Company. The National Stock Number assigned to this part is 6685013705232, 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 SYMBOL C2.