Choosing a robot for your shop floor starts with a hard question: do you need a machine that can join a production line tomorrow, or a platform you can build and experiment with? In the industrial robotics cobots market, these two options sit at opposite ends. One is a fully assembled collaborative robot. The other is a mechanical arm kit. With an absolute price gap of roughly $16,380, the decision comes down to your goal.
Quick verdict
Go with the Omron TM5-700 if you need a production-ready robot for assembly, packaging, inspection, or logistics. Go with the ARM-21N4 kit if you want an inexpensive, hands-on way to learn arm mechanics and test different end effectors.
Comparison
| Item | Omron TM5-700 | ARM-21N4 Kit |
|---|---|---|
| Price | USD 16,500.00 | USD 119.23 |
| Delivery form | New, unopened collaborative robot | New, unassembled mechanical arm kit |
| Best for | Production assembly, packaging, inspection, logistics | Learning, prototyping, testing custom end effectors |
Where the Omron wins
The Omron TM5-700 wins when the job is real production. Its 700 mm reach and 6 kg payload put it in a different class, and the built-in vision-based robot control with TMvision and Landmark enables inspections, measurements, and quick changeover. The plug-and-play ecosystem adds EtherNet/IP, MODBUS, and PROFINET communication, so it can fit into an existing factory network. If you need a robot that can handle actual components and talk to your control system, the Omron is the one to put on your line.
Where the ARM-21N4 wins
The ARM-21N4 wins when the goal is learning or prototyping. The gripper holder accepts suction cups, electromagnets, forks, claws, and other tools, so you can experiment with different end effectors. The digital servo controller with metal gear output and double bearings gives you a durable base for bench work.
Product notes
Omron TM5-700
The Omron TM5-700 is the arm you choose when you need output today. It arrives in an unopened box as a fully assembled collaborative robot. With a 700 mm reach and a 6 kg payload, it is sized for assembly, packaging, inspection, and logistics tasks. Its built-in vision control and TMvision/Landmark features support visual serving, inspections, and measurement, and the EtherNet/IP, MODBUS, and PROFINET communication ports let it connect to industrial networks. The limitation is its position at the high end of the price spread: this is a serious capital budget, not a weekend tinkering project.
ARM-21N4 Robot Arm Kit
The ARM-21N4 kit starts at the opposite end of the budget. For USD 119.23, you get a 5-DOF mechanical arm with a digital servo controller and metal gear output with double bearings. The gripper holder fits suction cups, electromagnets, forks, claws, and other tools, so you can quickly swap end effectors. The compact link sizes-upper arm 121 mm, middle 111 mm, forearm 61 mm-make it a tabletop platform rather than a production machine. The trade-off is assembly: the product title says unassemble, so you will spend your first hours building the arm. If that process is part of the goal, this kit is a great place to start.
Final choice by use case
Choose the Omron TM5-700 if you have a production line that needs a robot for assembly, packaging, inspection, or logistics. Choose the ARM-21N4 if you want a low-cost, build-it-yourself arm for learning, teaching, or testing end effector ideas on a bench.
