Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25SU 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 MI40X25SU
Generating a robust 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation in compact spaces. The stainless-steel barrel and Ø16 rod shrug off mild corrosion and washdown environments better than painted alternatives. Equipped with a U-type 90-degree rear cover, it simplifies perpendicular port routing and pivot mounting. The integrated -S magnet enables position sensing with CMSG, DMSG or EMSG switches. Fixed TPU bumper pads absorb end-of-stroke impact across the short 25 mm travel.
For practical sizing, plan for a safe working load of roughly 377 N, which is about 60% of the 0.5 MPa push rating. In vertical lift setups, this translates to lifting around 32 kg with a 2:1 safety margin. Operating on a 1/4" air port, the unit cycles smoothly between 30 and 800 mm/s. Remember that the bumpers only decelerate the piston; they do not function as an adjustable air cushion.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25SU |
|---|---|
| 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 MI40X25SU
| 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 MI40X25SU Is Used
Heavy-Duty Clamping Station
Exerts up to 879.6 N of push force at 0.7 MPa to secure thick steel plates during a horizontal milling operation.
Pallet Diverter Arm
Uses the 90-degree U-type rear cover to pivot a heavy diverter gate, routing loaded pallets on a washdown packaging line.
Vertical Parts Ejector
Lifts finished metal castings weighing up to 32 kg out of a mold cavity, relying on the integrated magnet for DMSG stroke confirmation.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25SU the Right Cylinder?
As the largest bore in the MI family, the Ø40 sits at the top of the range with no larger standard size available. If your application requires less force, stepping down to the Ø32 bore drops the 0.5 MPa push force to 402.2 N, which might suit lighter guiding tasks. The 25 mm stroke keeps the retracted length highly compact, minimizing rod-bending risks even under high dynamic loads. Because this SKU includes the -S magnet, it is fully ready for CMSG, DMSG or EMSG electronic and reed sensors.
Note that a standard double-acting cylinder drifts when air pressure is lost or the valve is centered. The TPU bumpers only soften the stroke end and will not lock the load. If your machinery requires strict position holding during an emergency stop or pressure drop, install an external rod lock or a pilot-operated check valve alongside this actuator.
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 MI40X25SU FAQ
This double-acting cylinder uses a 1/4" air port. 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 stainless-steel barrel and rod offer excellent resistance to mild corrosion and washdown. It features fixed TPU bumper pads that decelerate the piston at the stroke end, but it does not have an adjustable air cushion. The built-in -S magnet allows you to mount CMSG, DMSG or EMSG sensors for position detection.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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