External Tooth Ring Gears for Industrial Applications

External gear teeth are cut on the outside of a gear blank and mesh with mating gears externally, while internal gear teeth are cut on the inside of a ring-shaped blank. External tooth ring gears are commonly used in planetary systems where the planet gears orbit around a central sun gear and mesh with the ring gear's internal teeth — however, some ring gear configurations feature external teeth for specific transmission arrangements.

Carnes-Miller Gear manufactures ring gears with pitch diameters up to 10 inches (254mm). Face widths are available up to 5 inches (127mm). For applications requiring larger diameters, our team can discuss alternative manufacturing approaches or custom solutions suited to your assembly requirements.

Our ring gears achieve AGMA 10 quality when manufactured via hobbing or shaping processes, and AGMA 13 quality on ground gears. AGMA 13 is a high-precision rating suitable for demanding industrial, aerospace, and defense applications requiring tight tolerances, smooth operation, and minimal noise or vibration in service.

Yes. Carnes-Miller Gear has full manufacturing experience for complete planetary gear assemblies, including sun gears, planet gears, and ring gears up to 10 inches pitch diameter. All components are manufactured to mate precisely, ensuring proper tooth engagement, load distribution, and long service life within epicyclic gear systems.

Our ring gears serve a wide range of industries including mining, construction, transportation, agricultural machinery, rail, industrial equipment, aerospace, and defense. Carnes-Miller Gear's 50+ years of experience means we understand the specific demands — load cycles, material requirements, and precision standards — across each of these sectors.

Yes. Carnes-Miller Gear provides reverse engineering services for obsolete or discontinued ring gears where original drawings are unavailable. Our team performs dimensional data collection and inspection, then manufactures replacement ring gears to match or improve on the original specifications, ensuring your equipment is restored to full operating capability.