Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 25mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke25 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 MI40X25U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation in tight spaces. The stainless-steel barrel and piston rod provide excellent mild-corrosion and washdown resistance, outperforming painted alternatives in damp environments. Riveted construction keeps the unit compact, while fixed TPU bumper pads absorb impact energy at the stroke extremes. It features a 1/4" port and a robust Ø16 mm rod.
Because the 25 mm stroke is very short, the fixed bumpers play a critical role in managing rapid end-of-travel impacts without adjustable cushioning. Plan for a safe working load of roughly 377 N, which is about 60 percent of the 0.5 MPa push rating. Alternatively, you can estimate a vertical lift capacity of around 32 kg when applying a 2:1 safety margin, letting you match the cylinder directly to real part weights.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 MI40X25U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 MI40X25U Is Used
Short-Stroke Stamping
Ideal for driving heavy stamping or crimping heads over a precise 25 mm travel distance where high impact force is required.
Heavy Diverter Gate
Provides the robust push needed to pivot heavy diverter gates on high-throughput packaging conveyors handling dense products.
Pallet Stop Block
Acts as a rugged pneumatic stop for loaded pallets on roller lines, using its 32 kg vertical-lift equivalent force to arrest momentum.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25U the Right Cylinder?
As the largest bore in the MI family, the Ø40 sits at the top of the range; if your application requires less force, stepping down to the Ø32 bore provides 402.2 N of push at 0.5 MPa. There is no larger standard MI bore available. The U-style back cover orients the rear port at 90 degrees, which helps route hoses cleanly in confined machinery. This specific SKU lacks the -S magnet, meaning it cannot host CMSG, DMSG, or EMSG position switches; add the -S variant if you require electronic stroke confirmation.
Keep in mind that a plain double-acting cylinder drifts when air pressure is lost or the valve is centered, as the TPU bumpers only decelerate the stroke end and act as neither a brake nor a position lock. To suspend a load safely during an outage, integrate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
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 MI40X25U FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa. The air port size is 1/4".
No, this specific SKU does not include a magnet. To use CMSG, DMSG, or EMSG magnetic switches, you must select the -S magnet variant. Additionally, the U-style back cover provides a 90-degree port orientation for compact installations.
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Covers non-human-caused product damage.
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