Sakai UCN-80B-25X25 Precision Shaft Couplings

UCN-80B-25X25 is a bolt-clamp, precision compensation shaft coupling from Sakai Manufacturing Co., Ltd., part of the UCN-B series designed to join two shafts with high accuracy while accommodating small misalignments. Specifically, the model UCN-80B-25X25 uses 25 mm bores on both sides (25×25) and measures 80 mm in overall length, enabling a compact yet rigid connection in precision drives. It secures shafts with a bolt-clamp mechanism to maintain concentricity under load, a hallmark of Sakai's precision couplings. For the 25-25 variant, the assembly provides an allowable torque of 80 N·m and an allowable misalignment (eccentricity) around 0.2 mm, reflecting its suitability for moderate-to-high torque transmission while forgiving minor shaft runout. Part of Sakai's UCn-B lineup, this series emphasizes repeatable alignment and robust torque transfer in precision machinery, making it appropriate for applications where shaft alignment matters and drift cannot be tolerated.