Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OKC311.15 21428 found under Coupling Shaft Rigid by Skf Usa Inc. The National Stock Number assigned to this part is 3010004535798, 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 OKC311.15 21428.