Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ACR-112-16-16 found under Coupling Shaft Flexible by Helical Products Company Inc. The National Stock Number assigned to this part is 3010013384820, 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 ACR-112-16-16.