Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ESL3-0039-61-13-120 found under by Servo Gear Engineering Co Inc. The National Stock Number assigned to this part is 3010000839082, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ESL3-0039-61-13-120.