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Compare two gear rating standards to reach a consensus.
At Regal Rexnord, we have observed the following trend between AGMA and ISO gear tooth number grades:
ISO 6336 rates case-hardened gears 5% to 35% lower than AGMA 2101.
The mechanical ratings for carburized gears in ISO 6336 and AGMA 2101 differ by no more than 10%.
ISO 6336 permits helix angles only between 5° and 15° and penalizes designs that fall outside this range.
ISO 6336 overestimates the mechanical capacity of large, low-precision, slow-speed gear sets.
So, how do you compare two gear‑drive options with different ratings?
When evaluating gear‑drive selection—one based on AGMA 2101 and the other on ISO 6336—keep in mind that both methods are computational approaches that assume ideal lubrication and operating conditions. Note that ISO 6336 permits gear designers to account for surface roughness and lubricant viscosity in their ratings. For accurate calculations and comparisons, the gears must operate under the same load, speed, lubrication, and manufacturing accuracy as assumed in the original assessments.
It should be remembered that the gear itself may not govern the rated capacity of the gear drive. A gear drive is a component system comprising gears, shafts, and bearings, but its mechanical rating is determined by the lowest‑rated element among these components. If the shaft or bearing limits the gear drive’s performance, then the methods used to evaluate the gears become less critical. Furthermore, the thermal rating of a gear drive—its ability to dissipate heat during operation—may also fall far short of its mechanical rating. The available cooling options ultimately dictate the final choice.
Therefore, the answer to the question “which gear rating standard is better” is not straightforward. Gear rating standards are merely guidelines and do not provide a complete picture of gear drives or gear assemblies. If you require guidance, a Regal Rexnord representative will help you identify the solution best suited to your specific application.
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Shenzhen Jier Transmission Equipment Co., Ltd. is a high-tech enterprise that has been focusing on the sales, maintenance, and technical services of reducers for more than ten years. It is the core agent of world-renowned brands such as SEW reducers, NORD reducers, Bauer reducers, and Baumer sensors in Switzerland in Germany
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