# Ti5 Robot CRA-RI100-120-PRO-51 Harmonic Joint Module

![Ti5 Robot CRA-RI100-120-PRO-51 Harmonic Joint Module](https://parts.trymaglev.com/img/ac-ti5-cra-ri100-120-pro-51.webp)

Large hollow-shaft (32 mm) strain-wave joint module, 51:1, about 2.5 kg, for cobot bases and humanoid hips; also offered in 81/101/121/161 ratios.

- Maglev ID: ac-ti5-cra-ri100-120-pro-51
- Brand: Ti5 Robot
- MPN: CRA-RI100-120-PRO-51
- Category: actuators / Integrated Joint Actuators
- Origin: CN (maker HQ, factory not confirmed)
- Maker: Ti5 Robot (钛虎机器人) (brand, CN)
- NDAA: unknown · Blue UAS: unknown · FCC: n/a
- HTS: 8501.31.40.00 (typical)
- MOQ: unknown · Lead time: unknown
- Confidence: REPORTED

## Price
- 1+: $1,190 (distributor, 2026-10-30, https://aifitlab.com/products/ti5-robot-cra-ri100-120-pro-motor; Variant: 51 ratio, single encoder, without brake; dual encoder $1400)

## Specifications
- Peak torque: 267 N·m start-stop peak (51:1)
- Rated torque: 94 N·m at 2000 rpm input (51:1); max average load 133 N·m
- Gear ratio: 51:1 (backlash 20 arcsec; harmonic type implied by ratio set, not stated)
- Voltage: 24-48 V supply
- Mass: 2520 g without brake
- Interface: unknown

## Links
- Product: https://aifitlab.com/products/ti5-robot-cra-ri100-120-pro-motor
- Datasheet: none
- CAD: none

## Equivalents
- Harmonic Drive SHA-25A Integrated Servo Actuator (1:101) (ac-harmonicdrive-sha25a-101-integrated)

## Sources
- https://aifitlab.com/products/ti5-robot-cra-ri100-120-pro-motor (spec table + price + availability (distributor; product JSON https://aifitlab.com/products/ti5-robot-cra-ri100-120-pro-motor.js))