Dynamic Balancing Tolerance Calculator

Need to work out a balance tolerance?

Dynamic Balancing Tolerance Calculator utilizes the ISO Balance Quality Grade G and combines it with part specific information to calculate a balance tolerance.

ISO Balance Quality G Grade

ISO Balance Quality G Grades are used to calculate balance tolerances in conjunction with the rotor weight and service speed (RPM).


EW 1] 2] MM/S


G 40


– Car wheels, wheel rims, wheel sets, drive shafts.

– Crankshaft-drives of elastically mounted fast four-cycle engines (gasoline or diesel) with six or more cylinders4).

– Crankshaft-drives for engines of cars, trucks and locomotives.

G 16


– Drive Shafts (propeller shafts, cardanshafts with special req

– Parts of crushing machinery.

– Parts of agricultural machinery.

– Individual components of engines (gasoline or diesel) for cars, trucks and locomotives.

– Crankshaft-drives of engines with six or more cylinders under special requirements.

G 6.3


– Parts or process plant machines.

– Marine main turbine gears (merchant service).

– Centrifugal drums.

– Fans

– Assembled aircraft gas turbine rotors.

– Fly wheels.

– Pump impellers.

– Machine-tool and general machinery parts.

– Normal electrical armatures.

– Individual components of engines under special requirements.

G 2.5


– Gas and steam turbines, including marine turbines (merchant service).

– Rigid turbo-generator rotors.

– Rotors.

– Turbo-compressors.

– Machine-tool drives.

– Medium and large electrical armatures with special requirements.

– Small electrical armatures.

– Turbine-driven pumps.

G 1.0


– Tape recorder and phonographs (gramophone) drives.

– Grinding-machine drives.

– Small electrical armatures with special requirements

G 0.4


Spinles, disks and armatures of precision grinders.

– Gyroscopes.

1] w=2xn / 60-N / 0, if n is measured in revolutions per minute and w in radians per second. To simplify: Tolerance = Component Weight [kg] x Quality Grade x 9549 / Operational Speed [RPM]

2] In general, for rigid rotors with two correction planes, one-half of the recommended residual unbalance is to be taken for each plane.