Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 30mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke30 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 MI40X30SU
Generating a hefty 628.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles heavy-duty actuation in tight spaces. The Ø40 mm bore features a 1/4" air port and a Ø16 mm piston rod with an M12x1.25 male thread. Its riveted stainless construction shrugs off mild corrosion, making it highly suitable for damp washdown environments where painted steel would fail. Equipped with a built-in magnet (-S), it supports CMSG, DMSG and EMSG sensors for position feedback.
Fixed TPU bumper pads absorb the impact at the stroke extremes, though they decelerate rather than provide adjustable cushioning. For practical sizing, plan for a safe working load of roughly 377 N, which means you can reliably lift about 32 kg vertically with a 2:1 safety margin. The U-type back cover provides a 90-degree port orientation, simplifying hose routing in cramped machinery.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 MI40X30SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 MI40X30SU Is Used
Stamping Pin Ejection
Uses the 628.3 N push force to knock heavy stamped metal pins out of a die on an automotive parts line.
Pallet Diverter Gate
Shifts heavy-loaded pallets onto a secondary packaging line, relying on the 32 kg safe vertical lift equivalent.
Carton Flap Folding
Folds thick cardboard flaps on large shipping cartons where damp washdown cleaning requires stainless steel.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30SU the Right Cylinder?
When sizing this 40 mm bore actuator, dropping down to the Ø32 model reduces the 0.5 MPa push force to 402.2 N, while no larger MI series option exists above it. Because this is a non-ISO-6432 round-body size, ensure your mounting brackets match the specific 40 mm footprint rather than standard mini-cylinder clevises. The 30 mm stroke is short, minimizing rod-bending side-load risks, but you must secure the load externally. If air pressure drops, the piston will drift; the fixed bumpers only soften the end-of-stroke impact and do not function as a brake. Install a pilot-operated check valve or an external rod lock if the application requires holding a vertical load in place.
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 MI40X30SU 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 is 1/4".
No, the piston will drift downward. The fixed TPU bumper pads only decelerate the stroke end and do not act as a lock. You must use an external rod lock or a pilot-operated check valve to hold a load.
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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.
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Most inquiries answered within 7-8 hours.
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