Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D4-4795-6644 found under Element Heater by Raytheon Engineers And Constructors. The National Stock Number assigned to this part is 1210000267940, 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 D4-4795-6644.