Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 225mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke225 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation tasks. The stainless-steel barrel and Ø16 mm piston rod resist mild corrosion, making the riveted construction a durable choice for damp or washdown environments. It breathes through a 1/4" port and relies on fixed TPU bumper pads to decelerate the stroke end. Because this SKU lacks the -S suffix, it cannot host CMSG, DMSG or EMSG magnetic switches.
For practical sizing, plan for around 377 N of actual work at 0.5 MPa, which translates to lifting roughly 32 kg vertically with a 2:1 safety margin. The U-type back cover orients the rear port 90 degrees to the body, simplifying hose routing in tight machinery. Operating between 0.15-1.0 MPa, the unit travels its 225 mm stroke at speeds of 30-800 mm/s.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Fixed TPU bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MI/MIC (ISO 6432) datasheet. Barrel & rod: stainless steel (round-body, riveted construction). Thread options: PT (blank) / G. Note: the Ø40 bore is a larger, non-ISO-6432 size.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MI-family variants: MI / MIC (double acting ±cushion), MSI / MTI (single acting push / pull), MID / MICD (double rod ±cushion), MIJ / MICJ (adjustable stroke ±cushion). Back covers CA / U / R / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U Is Used
Heavy Part Ejection
Thrusts finished metal castings out of a machining center using the full 628.3 N push force available at 0.5 MPa.
Vertical Pressing
Pushes components down into assembly fixtures, safely applying around 377 N of working force without overstressing the tooling.
Pallet Diversion
Swings heavy timber or steel pallets across a transfer line, with the U-type back cover keeping the 1/4" air hose safely out of the main workspace.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U the Right Cylinder?
When sizing this 225 mm stroke model, compare it against the neighboring Ø32 bore, which yields 402.2 N of push at 0.5 MPa, before stepping up to this Ø40 unit for higher demand. There is no larger standard MI bore, so if your application exceeds the 879.6 N push available at 0.7 MPa, you must switch to a different cylinder family entirely. At 225 mm of travel, mind the side-load and rod-bending limits to prevent premature seal wear.
Remember that the fixed TPU bumpers only soften end-of-stroke impacts; they do not function as a lock. If air pressure drops or the valve centers, the piston will drift, so fit an external rod lock or pilot-operated check valve for suspended loads. This non-magnetized version cannot accept position sensors; choose the -S variant if your control system requires CMSG, DMSG or EMSG switches.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Do not dismantle the riveted front/back covers.
- check Use correct back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225U FAQ
This Ø40 mm cylinder pushes with 628.3 N and pulls with 527.8 N at 0.5 MPa. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa. It uses a 1/4" air port and an M12x1.25 male rod thread.
No, because this specific SKU lacks the -S magnet option, it cannot accept CMSG, DMSG or EMSG switches. You would need to order the -S variant for position sensing. The stainless-steel riveted round body still provides excellent washdown resistance, and the fixed TPU bumpers absorb stroke-end impact.
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