Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EJ51-04-10M4 found under Case Adapter Set Servo by Ta Instrument Case Co. The National Stock Number assigned to this part is 4920012292387, 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 EJ51-04-10M4.