Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number O6478 found under Disk Assy Clutch by Twin Disc Incorporated. The National Stock Number assigned to this part is 2520004962057, 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 O6478.