Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30U 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 MI40X30U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation in tight spaces. The Ø40 mm bore features a 1/4" port and a robust M12x1.25 male rod thread. Its stainless-steel barrel and piston rod resist mild corrosion, making it highly suitable for damp or washdown environments where painted alternatives fail. The riveted construction keeps the unit compact, while fixed TPU bumper pads absorb impact at the stroke ends.
Because this SKU lacks the -S magnet suffix, it cannot accept CMSG, DMSG, or EMSG position switches. For motion control, plan for a safe working load of roughly 377 N, which is about 60 percent of the 0.5 MPa push rating. Alternatively, you can use it to lift a 32 kg part vertically when applying a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30U |
|---|---|
| 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 MI40X30U
| 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 MI40X30U Is Used
Stamping Pin Ejection
Uses the 879.6 N push force at 0.7 MPa to eject heavy metal stamping pins from a die block in automotive lines.
Package Divert Arm
Powers a heavy-duty divert arm on a logistics conveyor, relying on the 527.8 N pull force to reposition the mechanism.
Lab Washdown Gate
Actuates a stainless-steel access gate in a pharmaceutical washdown station, benefiting from the 30 mm stroke and corrosion resistance.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30U the Right Cylinder?
When sizing this 40 mm bore, step down to the Ø32 model if your application only requires 402.2 N of push at 0.5 MPa, as this MI40X30U is the largest available bore in the series. The U-style back cover provides a 90-degree port orientation, which helps route hoses cleanly in confined machinery. Since this specific unit has no magnet, you must select an -S variant if your control system requires electronic end-of-stroke sensing.
If your process demands positive load holding during a complete air loss or when a valve is centred, note that the piston will drift. The fixed TPU bumpers only decelerate the stroke end and do not act as a mechanical brake. For secure positioning, install an external rod lock or a pilot-operated check valve in the air lines.
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 MI40X30U FAQ
This 40 mm bore cylinder features a 1/4" port and an M12x1.25 male rod thread. 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.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG, or EMSG switches. You must purchase an -S variant for position sensing. It uses fixed TPU bumper pads for deceleration, not 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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