Japan / China · Physical AI
Precision Reducers
Every robot joint needs a strain-wave or RV reducer. Two Japanese firms dominate; Chinese suppliers are scaling fast.
Alloy→Strain wave / RV→Joint→Robot
64
Tightness score ⓘ
#31 of 56
▲ Tightening
Lead time
6–12 mo
Theme 1M
−10.6%% in uptrend
33%Metric to watch
Harmonic Drive and Nabtesco orders, and humanoid reducer design wins.
What would prove us wrong
Weakens if Chinese reducers win share at much lower prices without quality issues.
Dependencies
Reducers theme performance
Equal-weight · rebased 100 · 1YStocks we track
Who controls this bottleneck
Roles, not recommendations. Delayed prices; local currency.
| Stock | Role | Listing | Last | 1D | 1M | 3M | YTD | Off 52w high | Trend | Next earnings |
|---|---|---|---|---|---|---|---|---|---|---|
| 6324.T Harmonic Drive Systems |
Strain-wave gears for robot joints | TSE Japan |
¥5,090.0 | +3.98% | −19.7% | −25.9% | +35.2% | −42.7% | 2026-11-11 | |
| 6268.T Nabtesco |
RV reducers for industrial robots | TSE Japan |
¥4,140.0 | +0.53% | −13.0% | −16.2% | +11.3% | −28.9% | 2026-10-30 | |
| 688017.SS Leaderdrive |
Chinese strain-wave reducers | SSE China |
¥293.0 | +1.03% | +0.8% | −10.3% | +52.6% | −39.9% | — |