Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 53-49T3E121-2 found under Heating Element Electrical Nonim by E And M Equipment Co. The National Stock Number assigned to this part is 4520010223818, 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 53-49T3E121-2.