Choosing an industrial robot arm is rarely a single-product decision. You may be setting up a benchtop cell, upgrading an automation line, or just starting to compare used gear. The four arms here span a wide budget range, from a compact IAI linear unit at $499.99 to a Nachi arm with controller and teach pendant at $7,999.99. The right pick depends on axis count, payload, controller setup, and how much integration you want to handle yourself.
Quick take
For the lowest entry point, the IAI two-axis linear unit is a good place to begin. For an arm with a teach pendant, the Nachi offers a complete package in this set. In between, the Mitsubishi RV-6S-S41 offers a used industrial arm with a specific compatible controller named, and the Staubli RX90 CS7 gives you an arm/controller pair with a clear description of cosmetic wear.
Listed price comparison
| Robot Arm | Listed Price | Price Bar |
|---|---|---|
| IAI 2x Axis Screwdriver Linear Robot Arm | $499.99 | |
| Staubli RX90 CS7 | $2,499.99 | |
| Mitsubishi RV-6S-S41 | $3,200.00 | |
| Nachi MZ07 6-Axis Industrial Robot Arm W/ CFD Controller & Teach Pendant 7kg | $7,999.99 |
Price differences only matter if the arm can actually get you to a working cell. The IAI needs a separate servo drive for its screwgun motor. The Mitsubishi points to a LENZE controller as the compatible match. The Nachi includes a controller and pendant. The Staubli includes a controller but comes with a dent and a missing key. Keep those integration details in mind as you compare prices.
Decision matrix
| If your priority is... | Look at... | Why |
|---|---|---|
| A compact linear axis to learn on | IAI | Two-axis movement with DSRC CAN controllers |
| A complete six-axis setup with pendant | Nachi | 7 kg payload, 723mm reach, controller and teach pendant |
| An industrial arm with a controller path | Mitsubishi | RV-6S-S41 with LENZE EVS9323-EPV004 |
| A used arm/controller pair, wear accepted | Staubli | RX90 and CS7 together |
Product notes
#### IAI 2x Axis Screwdriver Linear Robot Arm
If you want a compact linear axis to learn on, this used IAI unit is a good starting point. It gives you two axes of movement described as 8" in Z and 4" in Y, with DSRC CAN controllers for the actuators. The title also points to a Yaskawa SGME-01AFNS11 screwdriver servo motor. The catch: the listing says there is no servo drive for the screwgun motor, so you will need to source one before you can use the screwdriver function. Treat it as a starting point for a benchtop experiment, not a drop-in tool.
#### MITSUBISHI ROBOT ARM RV-6S-S41
The Mitsubishi gives you an industrial arm with a control compatibility target. The listing names LENZE EVS9323-EPV004 as the compatible controller, which is useful when you are planning the rest of the cell. The arm is sold as used and comes with a model type of RV-6S-S41. The limitation is that your control setup has to line up with that LENZE model, so the arm alone may not be ready to run without a matching controller. If you already have a controller path in mind, this is a good arm to build around.
#### Nachi MZ07 6-Axis Industrial Robot Arm W/ CFD Controller & Teach Pendant 7kg
This Nachi is the top-priced unit in the comparison, and it is also the one listed with a teach pendant. It has a 7 kg payload and 723mm reach, and it includes a CFD controller. The combination means you are getting the major pieces of a robot cell in one purchase. The trade-off is the high end of the price bar: that extra cost only makes sense if you need the payload and pendant. For a production or R&D role where those specs matter, it is the most complete starting point. For a first experiment, you may be better off with a less expensive arm.
#### Staubli RX90 CS7
The Staubli pairs the RX90 arm with a CS7 controller, which is helpful if you want to avoid assembling components from multiple sources. The listing is upfront about a dent on the corner and a missing key, so you know exactly what you're getting cosmetically. That clarity is valuable on a used industrial unit. The limitation is that the listing notes only the items shown are included, so the package is the arm and controller as pictured. If you can work with those cosmetic flaws, this is a straightforward used pair to consider.
Final recommendation by use case
- Starting point for linear motion experiments: IAI 2x Axis Screwdriver Linear Robot Arm
- Mid-range arm with a controller path: Mitsubishi RV-6S-S41
- Complete arm, controller, and pendant: Nachi MZ07
- Used arm/controller pair, cosmetics aside: Staubli RX90 CS7
