GB/T 9239.32-2017

This standard specifies the key convention for balancing rotors, defining how keys and keyways on shafts and their mating components (such as pulleys or couplings) should be treated during the balancing process. It is applied in mechanical engineering and manufacturing contexts where rotating machinery, such as pumps, turbines, or electric motors, requires precise dynamic balancing to minimize vibration. The standard ensures consistent balancing procedures by dictating whether full, half, or no keys are used on the shaft and fitment during testing and final assembly.