AGMA lubricant numbers

For industrial gears and circulating oils there is a specification published by the American Gear Manufacturers Association, which expresses the viscosities corresponding to the AGMA Lubricant Numbers in Saybolt Universal Seconds only. The approximate viscosities in centistokes are provided in Table 52.4 for convenience. The recommendations in Tables 52.5 and 52.6 are intended as a guide for lubricant selection. 

Table 52.5 Lubrication of industrial enclosed gear drives. AGMA Lubricant Number recommendations for helical, herringbone, straight bevel, spiral bevel and spur ...

Viscosities of AGMA lubricant number 13 and above are specified at 100°C (210°F) as measurement of viscosities of these heavy lubricants at 40°C (100 F) would not be practical. 

AGM A specifications covering gear lubricants. The viscosity ranges of the AGMA numbers conform to the International Standards Organization (ISO) viscosity classification system (see ISO viscosity classification system). AGMA numbers and their viscosity ranges are as follows ... 

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