Master-4031.065-Kupplung K2

This item is listed as a coupling of type K2, supplied under the Master brand. In air-heating systems, couplings of this class connect the motor shaft to the fan impeller or to a pump, transmitting torque while accommodating minor misalignment between the driving and driven components. They are typically installed in the fan housing or on the burner motor assembly, where they transfer rotation from the electric motor to the air-moving or fuel-delivery element. When selecting a replacement coupling, the critical parameters are the shaft diameters on both sides, the length of the coupling hub, and the keyway dimensions if the shafts are keyed. The coupling should be matched to the motor’s output speed and the torque required by the fan or pump; an undersized coupling can fail under load, while an oversized one may not fit the shaft spacing. Before installing, check that the existing coupling halves and any flexible element are free from cracks or wear, and confirm that the shaft alignment falls within the coupling’s tolerance. If the coupling uses a rubber or polyurethane insert, replace it together with the metal hubs when signs of ageing appear.