Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E2440 found under Spacer Bearing Adap by Appleton Electric Ltd. The National Stock Number assigned to this part is 2520005277989, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E2440.