Airtac MI25~40 Stainless Steel Mini Cylinder MI40X280SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X280SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 280mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke280 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 MI40X280SU
Delivering 628.3 N of push force at 0.5 MPa, the AirTAC MI40X280SU is a robust double-acting round-body mini cylinder built for demanding automation. Its stainless-steel barrel and Ø16 rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel alternatives quickly degrade. The 280 mm stroke operates at speeds between 30-800 mm/s, relying on fixed TPU bumper pads to decelerate the piston at both stroke ends.
This 40 mm bore unit features a 1/4" air port and a male M12x1.25 rod thread. Because it generates substantial thrust, you can plan for a safe working load of roughly 377 N of real work at 0.5 MPa. In vertical lifting applications, this translates to hoisting about 32 kg safely with a 2:1 margin. The built-in piston magnet (-S) fully supports CMSG, DMSG and EMSG position switches, while the U back cover provides a 90-degree port orientation for tight machinery layouts.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X280SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X280SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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 MI40X280SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 MI40X280SU Is Used
Stamping Press Feeders
Pushes metal blanks into small stamping presses using its 628.3 N thrust, with the stainless body surviving oily shop environments.
Heavy Package Diverters
Actuates routing gates on packaging lines for parcels up to 32 kg, utilising the 280 mm stroke to clear wide conveyor belts.
Pallet Component Indexing
Shifts heavy palletised components laterally on roller conveyors, relying on the 90-degree U rear cover for streamlined port plumbing.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X280SU the Right Cylinder?
When sizing this 40 mm bore actuator, compare its 628.3 N push force at 0.5 MPa against the smaller Ø32 bore, which supplies 402.2 N. If your application requires even more power, note that the Ø40 is the largest available in this series, so higher forces would require a different cylinder family entirely. The 280 mm stroke is well within the 500 mm maximum standard stroke limit, keeping the unit as a readily available configuration.
Remember that a plain double-acting cylinder like this will drift if air pressure is lost or the directional valve is centred; the TPU bumpers only soften the end-of-stroke impact and do not function as a braking lock. To suspend a load safely during an air failure, 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 MI40X280SU FAQ
This double-acting 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, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
Yes to the sensor: the -S suffix denotes a built-in magnet compatible with CMSG, DMSG and EMSG switches. Regarding the cushion, this base MI model features fixed TPU bumper pads that merely decelerate the stroke end; it does not have an adjustable air cushion. For adjustable cushioning, look at the MIC variant.
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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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Most inquiries answered within 7-8 hours.
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