Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 250mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke250 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 MI40X250U
Delivering a robust 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles substantial actuation duties within a compact footprint. The stainless-steel barrel and Ø16 mm piston rod supply genuine mild-corrosion and washdown resistance, outperforming painted alternatives in damp production zones. It features a 1/4" air port and a 250 mm stroke.
Because the fixed TPU bumper pads only decelerate the stroke end rather than acting as an adjustable air cushion, you should plan for a safe working load of roughly 377 N. This translates to lifting about 32 kg vertically with a 2:1 safety margin, letting you match the actuator to real part weights without complex math.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MI40X250U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MI40X250U Is Used
Heavy Carton Diverter
Pushes loaded packaging cartons weighing up to 30 kg onto secondary packaging lines using the 628.3 N thrust at 0.5 MPa.
Washdown Gate Actuator
Operates stainless-steel routing gates in food processing zones where the riveted round-body construction resists mild corrosion and moisture.
Pallet Component Lift
Raises lightweight pallet sub-components 250 mm vertically, safely handling loads around 32 kg with a proper 2:1 safety factor.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250U the Right Cylinder?
Sizing around this 40 mm bore is straightforward since it sits at the top of the MI range. If your application requires less push, stepping down to the Ø32 bore yields 402.2 N at 0.5 MPa; there is no larger standard MI bore available. The U-style back cover provides a 90-degree port orientation, which helps route hoses cleanly in tight machine frames.
Keep in mind that a standard double-acting cylinder drifts when air is lost or the valve is centred, as the bumpers only soften the end-of-stroke impact and never lock the load. To hold a suspended weight securely, you must add an external rod lock or a pilot-operated check valve. Additionally, this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG position 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 MI40X250U FAQ
This 40 mm bore cylinder uses a 1/4" air port. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum force of 128.1 kgf at 1.0 MPa.
No, this specific SKU does not include the -S magnet, so it cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for position sensing. It also features fixed TPU bumper pads rather than an adjustable air cushion.
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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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