Head to head
KUKA KR 20 R3100 vs Universal Robots UR20
A specification duel across payload, reach, precision, and footprint, with a plain read on which arm suits which job.
Extended reach robot for large envelope handling tasks
Industrial reach cobot for heavier handling jobs
Specification duel
Green marks the stronger figure. Unconfirmed specs are shown but not scored.
The verdict
The first question here is not specs but the cell: the Universal Robots UR20 is a collaborative arm designed for reduced-speed operation near people (fenceless only where an application risk assessment allows it), while the KUKA KR 20 R3100 is a 6-axis industrial arm that runs behind a guard at full speed. They run different controllers, the KUKA KR 20 R3100 on the KR C5 and the Universal Robots UR20 on the Control Box, so whichever platform your team already programs and stocks parts for is a real tiebreaker. Mounting options differ: the KUKA KR 20 R3100 lists Floor, Ceiling, Wall, and Angle, and the Universal Robots UR20 lists Floor, Wall, Ceiling, and Any angle / tilted. Both are aimed at material handling and machine tending, with the KUKA KR 20 R3100 stretching to packaging and dispensing and the Universal Robots UR20 to collaborative assembly and palletizing.
Choose this one when
Job fit first, then the controller and cell constraints that decide which arm you can actually install.
Choose the KUKA KR 20 R3100 when
- Exceptional reach for its payload class
- Good choice for servicing multiple stations
- Solid repeatability at full extension
- Ceiling mount option saves floor space
Watch for
- Long arm needs a rigid mounting structure
- Slower cycle times at full reach compared to shorter arms
Choose the Universal Robots UR20 when
- Long reach for a collaborative robot
- Higher payload than classic e-Series models
- Familiar UR programming for existing UR users
- Slimmer joint design improves access in tight cells
Watch for
- Larger footprint than UR's smaller cobots
- Newer platform with a shorter installed base track record
Controller ecosystem
Programming habits, spare parts, and pendant familiarity often decide the pick when payloads are close.
- Brand
- KUKA
- Controller
- KR C5
- Class
- 6-axis industrial
Service, spares, and pendant training for the KUKA KR 20 R3100 run through KUKA's KR C5 stack.
- Brand
- Universal Robots
- Controller
- Control Box
- Class
- collaborative
Service, spares, and pendant training for the Universal Robots UR20 run through Universal Robots's Control Box stack.
These arms run different controllers (KR C5 vs Control Box). If your team already programs one of them, retraining programmers and stocking a second set of spares usually costs more than a small payload or reach advantage on paper.
Mounting, footprint, and mass
How the arm can be oriented in the cell, and how much mass you have to mount.
| Field | KUKA KR 20 R3100 | Universal Robots UR20 |
|---|---|---|
| Mounting | Floor, Ceiling, Wall, and Angle | Floor, Wall, Ceiling, and Any angle / tilted |
| Robot mass | 549 kg | 64 kg |
| Protection (IP) | IP65 | IP65 |
Heavier arms want stiffer bases and more clearance around the swept volume, and they push freight and rigging costs up on the install. IP ratings only cover the section they name, so a wrist-only rating protects the wrist and nothing else; check the body rating separately before you commit the arm to a washdown or dusty cell.
Application fit
Where each arm is aimed, based on the applications listed on its robot page.
Both pages list material handling and machine tending, with the differences below.
KUKA KR 20 R3100 also covers
Universal Robots UR20 also covers
- collaborative assembly
- palletizing
Speed and cycle-time planning
Speed is rarely a single datasheet number across brands. Use payload, reach, and class as the planning frame, then confirm cycle time in a path study.
The KUKA KR 20 R3100 is a 6-axis industrial arm rated 20 kg at 3101 mm with ±0.05 mm repeatability. The Universal Robots UR20 is a collaborative arm rated 20 kg at 1750 mm with ±0.1 mm. Class changes how speed shows up in a cell: collaborative arms slow down near people and can speed up in a guarded mode, while industrial arms run at rated speed inside a fence or scanner field. Which arm cycles faster on your part depends on the path, the payload, and the safeguarding, so confirm the takt with a path study before you quote it.
Common questions
- Which has more payload, the KUKA KR 20 R3100 or the Universal Robots UR20?
- The KUKA KR 20 R3100 and Universal Robots UR20 match at 20 kg.
- Which reaches farther?
- The KUKA KR 20 R3100 has more reach at 3101 mm versus 1750 mm.
- Which is more precise?
- The KUKA KR 20 R3100 holds tighter repeatability at ±0.05 mm.
- Should I choose the KUKA KR 20 R3100 or the Universal Robots UR20?
- Match the pick to the job. The KUKA KR 20 R3100 is a 6-axis industrial arm at 20 kg and 3101 mm. The Universal Robots UR20 is a collaborative arm at 20 kg and 1750 mm.
- Do the KUKA KR 20 R3100 and Universal Robots UR20 use the same controller?
- No. The KUKA KR 20 R3100 uses KR C5 and the Universal Robots UR20 uses Control Box.
- How do the IP ratings compare?
- The KUKA KR 20 R3100 is rated IP65. The Universal Robots UR20 is rated IP65. Check wrist versus body coverage before washdown or dusty cells.