Quick Take
When you're outfitting an industrial robotics cobot workcell, the first decision is usually arm geometry: a 4-axis SCARA or a 6-axis articulated arm. The four listings here-one Mitsubishi and three Staubli units-also force you to weigh payload, reach, and the condition of a used unit. The listed-price range runs from $1,800 for a 20kg-capable SCARA to $7,999.99 for a Staubli TX2-60L that's listed as tested and working.
- Mitsubishi Melfa RH-20SDH8535: 4-axis SCARA with 20kg payload and 850mm reach; listed at $1,800. External cables were cut during decommissioning.
- Staubli Faverges TX90 ESD: 6-axis with 100cm reach and 6kg payload; listed at $2,999.99. It shows an oil leak and cosmetic wear.
- Staubli TX2-60L: 6-axis articulated with 920mm reach and 4.5kg payload; listed at $7,999.99. The listing says it's tested and working.
- Staubli RX90 CS7: 6-axis arm controller only; listed at $2,499.99. It has a dent and a missing key.
Listed Price Comparison
| Product | Listed price | Price bar | What stands out |
|---|---|---|---|
| Mitsubishi Melfa RH-20SDH8535 SCARA 4-Axis 20kg | USD 1,800.00 | Lowest listed price; strong payload; external cables cut | |
| Staubli Faverges TX90 ESD 6-Axis 100cm 6kg | USD 2,999.99 | 6-axis with 1m reach; oil leak noted | |
| Staubli TX2-60L 6-Axis 920mm 4.5kg | USD 7,999.99 | Highest listed price; tested and working | |
| Staubli RX90 CS7 Controller 1997 | USD 2,499.99 | Controller only; dent and missing key |
Decision Matrix
| If you need... | Recommended pick | Why |
|---|---|---|
| High payload in a compact 4-axis platform | Mitsubishi RH-20SDH8535 | 20kg payload, 850mm reach, lowest listed price |
| A 6-axis arm with roughly 1m reach | Staubli TX90 ESD | 100cm reach and 6kg payload at a mid-range listed price |
| A ready-running 6-axis arm | Staubli TX2-60L | Listed as tested and working with 920mm reach |
| A replacement controller for an RX90 system | Staubli RX90 CS7 | CS7 controller identified for RX90; only pictured items included |
Product Notes
Mitsubishi Melfa RH-20SDH8535 SCARA Industrial Robot Arm 4-Axis 20kg Payload
This SCARA arm is the clear pick when you need to move heavy parts without paying for a 6-axis design. Its 20kg payload rating is the highest in this group, and the 850mm reach suits high-speed assembly, material handling, and packaging workflows. The unit came from a working environment, and the internal wiring remains intact. The trade-off is that the external connection wires and umbilical cables were cut during decommissioning. That makes this a better fit for a facility that can terminate or replace the external cabling, or for someone buying it for replacement inventory and parts.
Staubli Faverges TX90 ESD 6-Axis Industrial Robot Arm 100cm Reach 6 kg Payload
The TX90 ESD brings a 6-axis configuration with a 100cm reach and a 6kg payload, which makes it a useful way to get into articulated-arm motion for ESD-sensitive work. The reason to consider it is the combination of reach and axis count at a listed price below the TX2-60L in this set. The limitation is the condition: the arm is in fair cosmetic shape, one or both of joints 1 and 2 is leaking oil, the side is stained, and the custom end effector has scuffs and wear from prior use. It also comes in non-original packaging.
Staubli TX2-60L 6-Axis Articulated Industrial Robot Arm 920mm Reach 4.5kg
If you want an arm that's described as tested and working and that was pulled from a working environment, this Staubli TX2-60L is the most straightforward option here. The 6-axis articulated design gives you 920mm of reach and a 4.5kg payload, which fits medium-duty assembly and handling tasks. The main limitation is the cost: it carries the highest listed price in this group, and the sale includes only the items shown in the photos. That means you're paying for a used robot arm with a clean working-history statement, but you should plan around the exact contents pictured.
Staubli RX90 CS7 6-Axis Industrial Robot Arm Controller 1997 *READ*
This listing is for a controller, not a complete arm, so it's only relevant if you're building out an RX90-based cell or replacing the controller on an existing system. The title identifies it as a Staubli RX90 CS7 6-axis industrial robot arm controller from 1997. The reason to pick it is that it gives you an older CS7 controller at a listed price below the TX2-60L arm. The limitations are physical: it has a dent on a corner, the key is missing, and only the items shown in the photos are included. It's sold as used industrial surplus.
Bottom Line by Use Case
- If you need maximum payload on a 4-axis platform and can handle cable work: Mitsubishi Melfa RH-20SDH8535.
- If you want a 6-axis arm with about 1m reach and can work around an oil leak: Staubli TX90 ESD.
- If you want a tested and working 6-axis arm and the listed price fits: Staubli TX2-60L.
- If you need an RX90 controller for an existing system: Staubli RX90 CS7.
