Check the listing for details. Ringfeder AKD 18-16mm-17mm Bore Bellows Coupling. Condition: New. Listed at 150.00 USD. The Ringfeder AKD 18-16mm-17mm Bore Bellows Coupling is a flexible coupling designed for mechanical power transmission in industrial automation and motion control systems. This coupling allows for smooth and precise operation, even in environments where there may be misalignment or vibration. With a bore size of 16mm to 17mm, it is suitable for a range of applications requiring reliable and efficient power transmission. The bellows design of this coupling helps to absorb shock and reduce wear and tear on connected components, making it a durable and reliable choice for industrial machinery.