Gear Quality Numbers: How to Convert International Standards
SIGMA OEM can manufacture and supply high quality gears up to Q-number AGMA 14/DIN 3/ISO 3 for a variety of customer applications.
In the global marketplace, the Q-number standards vary from country to country. The Q-number, also known as Gear Quality Number or Gear Quality Grade, measures the geometric accuracy level of teeth on a gear. But when you travel from the US to Germany, for example, a completely different scale is used for this important metric.
In the USA, AGMA (American Gear Manufacturer's Association
), sets the Q-number standards, while Japan uses the metrics set forth by
JGMA (Japanese Gear Manufacturers Association
). The ISO (International Organization for Standardization http://www.iso.org/iso/home.html) provides standards for 162 countries, and Germany continues to employ the DIN (Deutsches Institut für Normung http://www.din.de/de/). These varying standards can lead to confusion in international transactions.