Gear Quality Number (Q-Number)

SANDMARK can manufacture and supply high quality gears, up to Gear Quality Number AGMA 14 (or DIN 3, or ISO 3).  The Gear Quality Number is also known as the Q-Number or the Gear Quality Grade.  The Q-Number for a gear is a measure of the geometric accuracy level of teeth on the gear.

While the standard used in the USA is set by AGMA (American Gear Manufacturer’s Association) ; other regions of the world use different standards for gear teeth quality. The following table provides a general cross-reference between different standards (JGMA – Japanese Gear Manufacturers Association , ISO – International Organization for Standardization , and DIN – Deutsche Industrial Normen). However, note that there is no direct and full conversion between the standards. The cross-reference table below notes the ‘likeness’ of the Q-Numbers in each standard.

AGMA (USA) ISO (INTERNATIONAL) DIN (GERMANY) JIS (JAPAN)
13
4
4
0
12
5
5
1
11
6
6
2
10
7
7
3
9
8
8
4
8
9
9
5

Higher the Q-Number in AGMA, the higher the quality of the gear.  Inversely, a lower Q-Number in ISO/DIN indicates higher quality.

A typical Gear Quality Measurement Report from SANDMARK is shown below.  The gear being measured here has been manufactured to a Q-Number of ISO/DIN 6-7, or AGMA 10-11.

About SANDMARK Global

SANDMARK Global, headquartered in Virginia USA, offers global sourcing solutions to Manufacturing and Product Development Companies with operations in North America , Europe and Asia. We help our customers lower costs, increase efficiency and drive innovation by becoming a true partner in their business activities.
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