It has 24mm x 24mm bores, 8mm x 8mm keyways, 57.2mm OD, and 81.3mm length.
Ruland standard length bellows couplings are a high torque zero-backlash coupling commonly found in responsive systems on semiconductor, solar, test and measurement, and printing equipment. Keyed Clamp Bellows Cplg, Bores 24x24mm, OD 2.200", Alum Hardware is metric and tests beyond DIN 912 12. This coupling has a four convolution bellows for higher torque and torsional stiffness capabilities than equivalent couplings with more convolutions.