AGMA Fine Pitch Tolerances / Quality Grades for Gears

AGMA Fine Pitch Tolerances / Quality Grades for Gears

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The gear tolerance chart below, lists the more common tolerance or quality specifications assigned for Spur, Helical and Herringbone type gears. Typically, the AGMA tolerance or quality number is provided on the engineering drawing face as part of a general requirements specification, such as a flag or delta note.

AGMA - Fine Pitch Gear Tolerances
AGMA Quality (Tolerance) Designation	Number. of Teeth and Pitch Diameter.	Diametral Pitch Range	Tooth to tooth Composite Tolerance	Total Tolerance
10	Up to 20 Teeth Over 20 Teeth Up to 1.999" Over 20 teeth 2" to 3.999" Over 20 teeth 4" and over	20 to 200 20 to 200 20 to 200 20 to 200	.0007 .0005 .0005 .0005	.0010 .0010 .0012 .0014
11	Up to 20 teeth Over 20 teeth Up to 1.999" Over 20 teeth 2" to 3.999" Over 20 teeth 4" and over	20 to 200 20 to 200 20 to 200 20 to 200	.0005 .0004 .0004 .0004	.0007 .0007 .0009 .0010
12	Up to 20 teeth Over 20 teeth Up to 1.999" Over 20 teeth 2" to 3.999" Over 20 teeth 4" and over	20 to 200 20 to 200 20 to 200 20 to 200	.0004 .0003 .0003 .0003	.0005 .0005 .0006 .0007
13	Up to 20 teeth Over 20 teeth Up to 1.999" Over 20 teeth 2" to 3.999" Over 20 teeth 4" and over	20 to 200 20 to 200 20 to 200 20 to 200	.0003 .0002 .0002 .0002	.0004 .0004 .0004 .0005
14	Up to 20 teeth Over 20 teeth Up to 1.999" Over 20 teeth 2" to 3.999" Over 20 teeth 4" and over	20 to 200 20 to 200 20 to 200 20 to 200	.00019 .00014 .00014 .00014	.00027 .00027 .00032 .00037
15	Up to 20 teeth Over 20 teeth Up to 1.999" Over 20 teeth 2" to 3.999" Over 20 teeth 4" and over	20 to 200 20 to 200 20 to 200 20 to 200	.00014 .00010 .00010 .00010	.00019 .00019 .00023 .00027

References: AGMA 390.2 (Gear Classifications for Spur, Helical and Herringbone)

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