150T Flex / 154T Circular Harmonic Drive — Harmonic Drives

Full assembly — free engineering reference, an STL download of the whole part, and a live customizer.

3D render of a 150T Flex / 154T Circular Harmonic Drive harmonic drives assembly, blueprint style, on white background
Flexspline teeth150
Circular spline teeth154
Tooth difference4
Reduction ratio37.5:1
Module0.2 mm
Pressure angle20°
Flexspline pitch diameter30 mm
Circular spline pitch diameter30.8 mm
Outer housing diameter32.46 mm
Face width0.6 mm
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This is a multi-part meshing assembly, not a single flat profile, so there's no SVG/DXF laser-cut pattern for it — only a 3D STL of the complete assembly, matching what the interactive generator itself exports.

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