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Harmonic Structure Type: The HCS-I series features a cup-type flexspline with a standard cylindrical configuration. The input shaft directly mates with the inner bore of the wave generator cam and is connected via a parallel key. This series is typically configured with the circular spline fixed and the flexspline serving as the output.
| Model | Size | Reduction Rate | Construction Code | Type |
|---|---|---|---|---|
| HST | 14 | 50, 80, 100 | U: Whole item C: Component |
I: Simple Standard II: Cross slide-bloke III: Hollow shaft IV: Input axial V: Simple combination |
| 17 | 50, 80, 100 | |||
| 20 | 50, 80, 100, 120 | |||
| 25 | 50, 80, 100, 120 | |||
| 32 | 50, 80, 100 | |||
| 40 | 100 |






