What is a Helical Angle 7 Internal Helical Ring Gear?
An internal helical ring gear with a helix angle of 7 degrees has teeth cut at a low angle on the inside of a ring, designed for minimal axial thrust and smooth operation. This type is often used in planetary gear systems, such as those in automotive transmissions, where quiet performance and high load capacity are essential. The 7-degree angle, lower than typical ranges (usually 12°–20° for single helical gears), might be suited for specific low-thrust applications, though exact details on this angle are less common in standard resources.
Gear/Spline Capability
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Internal gears and internal splines
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Teeth Milling
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Teeth Shaping
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Teeth grinding
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Maximum O.D.
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2500mm
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2500mm
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2500mm
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Minimum I.D.
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650mm
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50mm
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100mm
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Maximum Face Width
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500mm
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500mm
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500mm
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Maximum Diametral Pitch
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DP1
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DP1
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DP0.5
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Maximum Module
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26mm
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26mm
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45mm
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AGMA Grade / DIN Grade
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DIN grade 8
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DIN grade 8
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DIN grade 4
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Tooth Finish
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Ra 3.2
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Ra 3.2
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Ra 0.6
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Maximum Helix Angle
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±22.5°
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±22.5°
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±45°
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External gears and external splines
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Maximum O.D.
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1250mm
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2500mm
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2500mm
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Minimum I.D.
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20mm
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200mm
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20mm
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Maximum Face Width
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500mm
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500mm
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1480mm
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Maximum Diametral Pitch
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DP 1
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DP 1
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DP 0.5
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Maximum Module
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26 mm
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26 mm
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45 mm
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AGMA Grade / DIN Grade
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DIN grade 8
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DIN grade 8
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DIN grade 4
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Tooth Finish
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Ra 3.2
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Ra 3.2
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Ra 0.6
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Maximum Helix Angle
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±45°
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±45°
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±45°
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FMP’s Offerings and Local Relevance
FMP specializes in manufacturing a wide range of ring gears, including custom internal helical designs, serving industries in Milan, Venice, Florence, and Bologna. If a model like the helical angle 7 internal helical ring gear isn’t listed, customers can email their specifications, and FMP’s engineers will respond within 24 hours. This service is tailored for Italy’s dynamic engineering landscape, supporting sectors like automotive in Bologna and precision manufacturing in Florence.
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