ISO Standards
The G balance quality grades presented in the table are classified to optimize the operational performance of rotating parts and ensure precise balance in compliance with industrial standards. Each grade represents the maximum allowable residual unbalance level based on the rotor type and application requirements. MBS Balans utilizes these grades to provide the most suitable balancing solutions tailored to the specific needs of its customers.
|
ISO 21940 |
|
Grade G (mm/s) |
Balance rotors examples |
|
4000 |
Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently unbalanced |
|
1600 |
Crankshaft drives for large, slow marine diesel engines (piston speed below 9 m/s), inherently balanced |
|
630 |
Crankshaft drives, inherently unbalanced, elastically mounted |
|
250 |
Crankshaft drives, inherently unbalanced, rigidly mounted |
|
100 |
Complete reciprocating engines for cars, trucks and locomotives |
|
40 |
Cars; wheels, wheel rims, wheel sets, drive shafts Crankshaft drives, inherently balanced, elastically mounted |
|
16 |
Agricultural machinery Crankshaft drives, inherently balanced, rigidly mounted Crushing machines Drive shafts (cardan shafts, propeller shafts) |
|
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 turbines |
|
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 |
|
1 |
Audio and video drives Grinding machine drives |
|
0,4 |
Gyroscopes Spindles and drives of high-precision systems |