This Standard provides a method for determining the power rating of gear sets used in main mill drives@ pinion stands@ and combination units used for the reduction of material size in metal rolling mills. Applications include@ but are not limited to@ hot mills and cold mills@ roughing and finishing stands: reducing@ increasing@ and 1:1 ratio sets. Auxiliary drives@ including drives listed in ANSI/AGMA 6113-A06@ such as bridles@ coilers@ uncoilers@ edge trimmers@ flatteners@ loopers (accumulators)@ pinch rolls@ scrap choppers@ shears@ and slitters are not covered by this document. This standard includes a method by which different gear tooth designs can be rated and compared at extended life cycles typical for these applications@ up to 175 000 hours.