Balance quality and tolerances

Balance Grade, mm/s	Machinery Examples
G 4000	Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently unbalanced
G 1600	Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently balanced
G 630	Crankshaft drives, inherently unbalanced, elastically mounted
G 250	Crankshaft drives, inherently unbalanced, rigidly mounted
G 100	Complete reciprocating engines for cars, trucks and locomotives
G 40	Cars: wheels, wheel rims, wheel sets, drive shafts Crankshaft drives, inherently balanced, elastically mounted
G 16	Agricultural machinery Crankshaft drives, inherently balanced, rigidly mounted Crushing machines Drive shafts (cardan shafts, propeller shafts)
G 6,3	Aircraft gas turbines Centrifuges (separators, decanters) Electric motors and generators (of at least 80 mm shaft height), of maximum rated speeds up to 950 r/min Electric motors of shaft heights smaller than 80 mm Fans Gears Machinery, general Machine tools Paper machines Process plant machines Pumps Turbo chargers Water turbine
G 2,5	Compressors Computer drives Electric motors and generators (of at least 80 mm shaft height), of maximum rated speeds above 950 r/min Gas turbines and steam turbines Machine-tool drives Textile machines
G 1	Audio and video drives Grinding machine drive
G 0,4	Gyroscopes Spindles and drives of high-precision systems