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American Gear, Inc. - Precision Gears for Every Industry and Application Since 1990  
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Member of AGMA

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 To insure that all gear products are manufactured to industry quality standards, American Gear follows guidelines established by Amercian Gear Manufacturers Association (AGMA).  In addition, American Gears quality management system is ISO 9001:2008 certified.    
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 Correlation of Former Fine-Pitch Gear Classes (AGMA 236.04) with the Quality Numbering System of the Gear Classification Manual (AGMA 390.01)

Previous Fine-Pitch System, AGMA 236.04 Fine Pitch System, AGMA 390.02
AGMA Quality
No.
Tooth-to-Tooth Composite
Error
Total Composite Error AGMA Quality No. Tooth-to-Tooth Composite (Error) Tolerance Total Composite (Error) Tolerance
Commercial 1 0.0020 0.0060 5 or 6 0.0027 or 0.0019 0.0052 or 0.0037
Commercial 2 0.0015 0.0040 6 or 7 0.0019 or 0.0014 0.0037 or 0.0027
Commercial 3 0.0010 0.0020 8 0.0010 0.0019
Commercial 4 0.0007 0.0015 9 0.0007 0.0014
Precision 1 0.0004 0.0010 10 or 11 0.0005 or 0.0004 0.0010 or 0.0007
Precision 2 0.0003 0.0005 12 0.0003 0.0005
Precision 3 0.0002 0.00025 13 or 14 0.0002 or 0.00014 0.0004 or 0.00027
Gear Tolerances - Fine Pitch Spur and Helical Gears
AGMA Quality No.

Number of Teeth
and
Pitch Diameter

Diametral Pitch Range Tooth-to-Tooth Composite Tolerance Total Composite Tolerance
5 Up to 20 teeth inclusive 20 to 80 0.0037 0.0052
Over 20 teeth, up to 1.999" 20 to 32 0.0027 0.0052
Over 20 teeth, 2" to 3.999" 20 to 24 0.0027 0.0061
Over 20 teeth, 4" and over 20 to 24 0.0027 0.0072
6 Up to 20 teeth inclusive 20 to 200 0.0027 0.0037
Over 20 teeth, up to 1.999" 20 to 48 0.0019 0.0037
Over 20 teeth, 2" to 3.999" 20 to 32 0.0019 0.0044
Over 20 teeth, 4" and over 20 to 24 0.0019 0.0052
7 Up to 20 teeth inclusive 20 to 200 0.0019 0.0027
Over 20 teeth, up to 1.999" 20 to 200 0.0014 0.0027
Over 20 teeth, 2" to 3.999" 20 to 48 0.0014 0.0032
Over 20 teeth, 4" and over 20 to 40 0.0014 0.0037
8 Up to 20 teeth inclusive 20 to 200 0.0014 0.0019
Over 20 teeth, up to 1.999" 20 to 200 0.0010 0.0019
Over 20 teeth, 2" to 3.999" 20 to 100 0.0010 0.0023
Over 20 teeth, 4" and over 20 to 64 0.0010 0.0027
9 Up to 20 teeth inclusive 20 to 200 0.0010 0.0014
Over 20 teeth, up to 1.999" 20 to 200 0.0007 0.0014
Over 20 teeth, 2" to 3.999" 20 to 200 0.0007 0.0016
Over 20 teeth, 4" and over 20 to 120 0.0007 0.0019
10 Up to 20 teeth inclusive 20 to 200 0.0007 0.0010
Over 20 teeth, up to 1.999" 20 to 200 0.0005 0.0010
Over 20 teeth, 2" to 3.999" 20 to 200 0.0005 0.0012
Over 20 teeth, 4" and over 20 to 200 0.0005 0.0014
11 Up to 20 teeth inclusive 20 to 200 0.0005 0.0007
Over 20 teeth, up to 1.999" 20 to 200 0.0004 0.0007
Over 20 teeth, 2" to 3.999" 20 to 200 0.0004 0.0009
Over 20 teeth, 4" and over 20 to 200 0.0004 0.0010
12 Up to 20 teeth inclusive 20 to 200 0.0004 0.0005
Over 20 teeth, up to 1.999" 20 to 200 0.0003 0.0005
Over 20 teeth, 2" to 3.999" 20 to 200 0.0003 0.0006
Over 20 teeth, 4" and over 20 to 200 0.0003 0.0007
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