Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A8643 found under Transmission Mechanical Vehicular by Cleveland Trencher Co Inc. The National Stock Number assigned to this part is 2520006319167, 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 A8643.