Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ESC-12-2417BLK found under Thermocouple Switch by Emerson Electric Co. The National Stock Number assigned to this part is 6685010873924, 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 ESC-12-2417BLK.