Airtac MI25~40 Stainless Steel Mini Cylinder MI40X80SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X80SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 80mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke80 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 MI40X80SU
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation where smaller bores stall. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion and washdown, outperforming painted alternatives in damp environments. An 80 mm stroke moves loads briskly within a 30-800 mm/s speed range.
Plan for roughly 377 N of actual work at 0.5 MPa to maintain a safe margin, which translates to lifting about 32 kg vertically. The 1/4" port feeds air efficiently, while fixed TPU bumper pads absorb the stroke-end impact. Because this SKU includes the -S magnet, it is fully primed for CMSG, DMSG or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X80SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X80SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MI40X80SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MI40X80SU Is Used
Stamping Press Ejection
Kicks heavy stamped metal parts out of a 40-ton press bed using the full 628.3 N push force at 0.5 MPa.
Bottle Diverter Gate
Pivots a heavy stainless guide rail on a washdown filling line, where the corrosion-resistant rod survives daily moisture.
Pallet Stopper Arm
Halts loaded pallets on a gravity roller conveyor, using the 80 mm stroke and fixed TPU pads to absorb the carton impact.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X80SU the Right Cylinder?
Sizing against its neighbours, this 40 mm bore sits at the top of the MI range with no larger option available, easily outmuscling the 32 mm variant that provides 402.2 N push at 0.5 MPa. If your application demands less than 500 N, stepping down saves space, but for tasks approaching the 879.6 N push capacity at 0.7 MPa, this model is the correct choice. The U rear cover provides a 90-degree port orientation to simplify plumbing in tight layouts.
Remember that a standard pneumatic cylinder drifts when air pressure is lost or the valve is centred, as the TPU pads only decelerate the end of travel rather than locking the rod. To suspend a load securely during an air failure, integrate an external rod lock or a pilot-operated check valve into your 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 MI40X80SU FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it yields 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".
Yes to sensors: the -S suffix means a magnet is built-in, allowing CMSG, DMSG or EMSG switches. No to adjustable cushions: this base MI uses fixed TPU bumper pads to decelerate the stroke end. For adjustable air cushioning, look at the MIC variant.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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