Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A54580 found under Gear Assembly Speed by Koehring Co. The National Stock Number assigned to this part is 3010011720654, 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 A54580.