Sleeve Couplings Sleeve couplings transmit minimal to moderate shear torques between related equipment through elastic inserts with external splines mated to interior splines. The insert substance is generally EPDM, Neoprene or Hytrel, and the insert can be a one-piece or two-piece style. Moderate eccentricity Torsional damping (vibration) Conclude float with minimum axial engage in Minimal to average torque, basic-goal apps