Head to head
FANUC M-20iA vs FANUC M-20iD/25
A specification duel across payload, reach, precision, and footprint, with a plain read on which arm suits which job.
General-purpose mid arm for handling and welding
High-rigidity 25 kg arm for handling and welding.
Specification duel
Green marks the stronger figure. Unconfirmed specs are shown but not scored.
The verdict
The specs separate them here: the FANUC M-20iD/25 carries more, 25 kg to the FANUC M-20iA's 20 kg. If precision drives the job, the FANUC M-20iD/25 holds the tighter repeatability at ±0.02 mm. Both run the R-30iB Plus controller, so programming, spare parts, and operator familiarity carry across either way. Mounting options differ: the FANUC M-20iA lists Floor, Ceiling, and Angle, and the FANUC M-20iD/25 lists Floor, Angle, and Inverted. Both are aimed at material handling and arc welding, with the FANUC M-20iA stretching to assembly.
Choose this one when
Job fit first, then the controller and cell constraints that decide which arm you can actually install.
Choose the FANUC M-20iA when
- Excellent speed-to-payload ratio
- IP67 wrist tolerates weld spatter and coolant
- Wide selection of mounting orientations
- Mature platform with deep integrator familiarity
Watch for
- Reach is modest for large-part transfer
- Outperformed by lighter arms on pure pick-and-place cycle time
Choose the FANUC M-20iD/25 when
- Long reach for its payload
- Popular welding platform
Watch for
- Heavier base needs a solid mount
Controller ecosystem
Programming habits, spare parts, and pendant familiarity often decide the pick when payloads are close.
- Brand
- FANUC
- Controller
- R-30iB Plus
- Class
- 6-axis industrial
Service, spares, and pendant training for the FANUC M-20iA run through FANUC's R-30iB Plus stack.
- Brand
- FANUC
- Controller
- R-30iB Plus
- Class
- 6-axis industrial
Service, spares, and pendant training for the FANUC M-20iD/25 run through FANUC's R-30iB Plus stack.
Both arms run the R-30iB Plus controller, so pendant skills, program backups, and many spare parts carry over if you standardize on either model.
Mounting, footprint, and mass
How the arm can be oriented in the cell, and how much mass you have to mount.
| Field | FANUC M-20iA | FANUC M-20iD/25 |
|---|---|---|
| Mounting | Floor, Ceiling, and Angle | Floor, Angle, and Inverted |
| Robot mass | 250 kg | 250 kg |
| Protection (IP) | IP67 wrist & J3 arm / IP54 body (IP55 optional) | IP67 wrist & J3 arm / IP54 body (IP65 optional) |
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, arc welding, and machine tending, with the differences below.
FANUC M-20iA also covers
FANUC M-20iD/25 covers
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 FANUC M-20iA is a 6-axis industrial arm rated 20 kg at 1811 mm with ±0.03 mm repeatability. The FANUC M-20iD/25 is a 6-axis industrial arm rated 25 kg at 1831 mm with ±0.02 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 FANUC M-20iA or the FANUC M-20iD/25?
- The FANUC M-20iD/25 has more payload at 25 kg versus 20 kg.
- Which reaches farther?
- The FANUC M-20iD/25 has more reach at 1831 mm versus 1811 mm.
- Which is more precise?
- The FANUC M-20iD/25 holds tighter repeatability at ±0.02 mm.
- Should I choose the FANUC M-20iA or the FANUC M-20iD/25?
- Match the pick to the job. The FANUC M-20iA is a 6-axis industrial arm at 20 kg and 1811 mm. The FANUC M-20iD/25 is a 6-axis industrial arm at 25 kg and 1831 mm.
- Do the FANUC M-20iA and FANUC M-20iD/25 use the same controller?
- Yes. Both run the R-30iB Plus controller.
- How do the IP ratings compare?
- The FANUC M-20iA is rated IP67 wrist & J3 arm / IP54 body (IP55 optional). The FANUC M-20iD/25 is rated IP67 wrist & J3 arm / IP54 body (IP65 optional). Check wrist versus body coverage before washdown or dusty cells.