Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A323AF4REVU found under Button by Otis Elevator Co. The National Stock Number assigned to this part is 3960004751213, and the Federal Supply Class is 3960 Freight Elevators. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A323AF4REVU.