It can accommodate all forms of misalignment with low bearing loads helping to protect small sensitive bearings.787", Aluminum This Ruland supplied slit coupling is zero-backlash and has a balanced design for reduced vibration at high speeds up to 7,500 RPM. The coupling is made from a single piece of aluminum and has two sets of slit cuts allowing for low inertia, no maintenance, and high torsional stiffness when compared to beam couplings.This long slit coupling has increased torque and misalignment capabilities when compared to short styles.