Choosing between a $119 robot arm kit and a $12,750 collaborative robot might seem like a mismatch, but both have a place in industrial robotics. The real question is whether you need a hands-on learning platform or a production-ready 6-axis cell. The price gap is substantial-about $12,630-and that difference buys you very different capabilities, condition, and intended use.
Quick Verdict
If you want to experiment with 5-DOF arm mechanics, servo control, and gripper tooling on a modest budget, the ARM-21N4 5-DOF Robot Arm Kit is the clear pick. It ships new, unassembled, with metal-gear digital servos and a gripper holder. If you need a 6-axis collaborative robot with generous reach and payload, the Universal Robots UR5 package delivers that-but it's sold for parts or not working, untested since removal, so it's a project for a facility that can service and validate it.
Comparison Snapshot
| Product | Price | Condition | Configuration | Notable Specs |
|---|---|---|---|---|
| ARM-21N4 5-DOF Robot Arm Kit | USD 119.23 | New | 5-DOF arm kit | 20KG digital servos, metal gears + double bearings, gripper holder for suction cups, electromagnets, forks, claws |
| Universal Robots UR5 Collaborative Robot Package | USD 12,750.00 | For parts or not working | 6-axis collaborative robot | 850 mm reach, 5 kg payload, includes controller, teach pendant, mobile steel pedestal, safety scanner |
Where Each Product Wins
- The ARM-21N4 wins on price and condition. At USD 119.23, it's a new, unassembled kit that lets you build and program a 5-DOF arm from scratch. The included 20KG digital servos with metal gears and double bearings are good for learning and light automation experiments.
- The Universal Robots UR5 wins on capability and completeness. It's a true 6-axis collaborative robot with 850 mm reach and 5 kg payload, and the package includes a controller, teach pendant, mobile steel pedestal, and safety scanner. That's a full system, but it needs troubleshooting.
ARM-21N4 5-DOF Robot Arm Kit
The ARM-21N4 is a budget-friendly entry into robotic arms. For USD 119.23, you get an unassembled 5-DOF arm with 20KG digital servos that use metal gears and double bearings for durability. The arm segments are sized at 121mm upper arm, 111mm middle arm, and 61mm forearm, giving you a compact work envelope. A gripper holder is included, and it fits suction cups, electromagnets, forks, claws, and other end-of-arm tooling, so you can customize it for different pick-and-place mini tasks. This is a new unit, so you're not inheriting someone else's wear. The big limitation is that it's unassembled-you'll need to put it together and figure out the controller setup yourself. That's fine for a hobbyist or student, but it's not a production tool. Choose this if your goal is learning 5-DOF kinematics or testing servo-driven motion on a tight budget.
Universal Robots UR5 Collaborative Robot Package
The UR5 package is a completely different investment. At USD 12,750, you're getting two units (though the description focuses on a primary unit with serial number dated May 4, 2017) that include the UR5 arm, controller, teach pendant, controller tablet, and mounting on mobile steel pedestals. The arm specs are solid: 6 axes, 5 kg payload, and 850 mm reach. It also includes pneumatic end-of-arm case packer tooling and a safety scanner mounted to the base. The catch is the condition: it's listed as "For parts or not working" and untested since removal, and it includes only what is pictured. So you're buying a project. If your facility has the expertise to diagnose, repair, and revalidate a collaborative robot, the UR5 could be a bargain for a second-line or automation lab. But for anyone needing a plug-and-play cobot, this package carries real risk.
Final Choice by Use Case
- For learning, education, or light automation experiments: Choose the ARM-21N4 5-DOF Robot Arm Kit. It's new, inexpensive, and a great way to understand arm mechanics.
- For a facility that can repair and commission used automation: The Universal Robots UR5 package offers much more capability per dollar if you're prepared to handle the "for parts" condition. It's not for the faint of heart.
If you need a working cobot out of the box, neither is perfect: the ARM-21N4 is a kit, and the UR5 is untested. But for the right buyer, each can be the right call.
