Full specification
| Parameter | Value |
|---|---|
| Frame / size | Φ50 × 63 mm |
| Ratios | 51:1 / 81:1 / 101:1 |
| Rated torque @2000 rpm input | 6.6 / 9.6 / 9.6 N·m |
| Start–stop peak | 23 / 29 / 34 N·m |
| Weight | 0.66 kg |
| Supply voltage | 24–80 V |
| Encoder | Absolute, integrated |
| Comms | CAN, per configuration |
Source: Our current Ti5 datasheet — being re-verified against the latest Ti5 catalogue. Figures verified November 2026 — confirm the exact variant against the datasheet issued with your order.
When this is the right choice
- 81:1 is the useful middle. Nine point six newton-metres with 29 N·m start–stop — nearly the torque of the 101:1 build with more output speed.
- 34 N·m at 101:1 in 660 g is strong for the diameter, and the three ratios let one mechanical design cover three speed targets.
- 63 mm long keeps an elbow compact.
- 24–80 V — one part number across bench and robot bus.
When it is the wrong choice
- Rated torque is quoted at 2000 rpm input. Ti5 sizes on input speed; if your motor runs slower, the continuous output figure falls below 9.6 N·m.
- Specification being re-verified against the latest catalogue.
- No brake or torque sensor published — same limitation as the rest of CRA.
Alternatives at a similar level
- Ti5 CRA-RI60-80-PRO — 19.8–30 N·m at 1.03 kg — the shoulder frame
- Ti5 RI50-60-PRO-S — Short body, single 51:1 ratio, 450 g
- EYOU PHU14H-70 — 9.6 N·m with brake and force-control options
Quote this model
Model, quantity and destination is enough to start — we come back with price, availability and the datasheet.
CRA-RI50-70-PRO FAQ
Why does 101:1 not give more rated torque than 81:1?
Because the rated figure is limited by what the motor can put into the gear set at 2000 rpm input, not by the gear set itself. The 101:1 build converts that into more peak (34 against 29 N·m) and less output speed.
Is PRO-S worth looking at instead?
If you only need 51:1 and want less mass, yes — RI50-60-PRO-S is 450 g against 660 g for the same 6.6 N·m rated, at the cost of the ratio choice.
How long does it take to ship?
Confirmed per order at quotation, with the specification re-check on this series done at the same time.
Back to Ti5 Robotics · all joint modules · need a model that is not listed?