AGMA Quality Classes 6 through 12| AGMA quality number* |
DIN Number** |
Number of teeth and pitch diameter |
Diametral pitch range |
Tooth-to-tooth composite error tolerance |
Total composite error tolerances |
| 6 | 12 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 48 20 to 32 |
0.0027 0.0019 0.0019 |
0.0037 0.0037 0.0044 |
| 7 | 11 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 100 20 to 48 |
0.0019 0.0014 0.0014 |
0.0027 0.0027 0.0032 |
| 8 | 10 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 200 20 to 100 |
0.0014 0.0010 0.0010 |
0.0019 0.0019 0.0023 |
| 9 | 9 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 200 20 to 200 |
0.0010 0.0007 0.0007 |
0.0014 0.0014 0.0016 |
| 10 | 8 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 200 20 to 200 |
0.0007 0.0005 0.0005 |
0.0010 0.0010 0.0012 |
| 11 | 7 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 200 20 to 200 |
0.0005 0.0004 0.0004 |
0.0007 0.0007 0.0009 |
| 12 | 6 | Up to 20 teeth incl. Over 20 teeth up to 1.999” Over 20 teeth 2" to 3.999” |
20 to 200 20 to 200 20 to 200 |
0.0004 0.0003 0.0003 |
0.0005 0.0005 0.0006 |
*From AGMA “Gear Classification Manual for Spur, Helical and herringbone Gears,” AGMA 390.02, Sept. 1964.
**DIN. Quality numbers shown are approximately equal to corresponding AGMA number.