Airtac MI25~40 Stainless Steel Mini Cylinder MI25X120SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI25X120SU is a genuine double acting round-body mini air cylinder with a Ø25mm bore and 120mm stroke, 1/8" air ports and a stainless-steel barrel and rod for mildly corrosive environments. Its ISO 6432 mounting interface makes it a compact drop-in for standard mini-cylinder fixtures.
- BoreØ25 mm
- Stroke120 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionFixed TPU bumper pads
About the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X120SU
Delivering 245.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles substantial work for its compact footprint. The riveted stainless barrel and Ø10 mm rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel quickly degrades. Its 120 mm stroke operates at speeds between 30 and 800 mm/s, and the U-style back cover provides a 90-degree port orientation for tight machinery layouts.
Because it conforms to the ISO 6432 mounting interface for Ø25 bores, the body drops directly into standard mini-cylinder brackets and clevises. Plan for roughly 147 N of actual work at 0.5 MPa to maintain a safe margin, which translates to lifting about 12.5 kg vertically. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing, while fixed TPU bumper pads absorb the stroke-end impact. Air connects via 1/8" ports.
Airtac MI25~40 Stainless Steel Mini Cylinder MI25X120SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI25X120SU |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 120 mm |
| Acting type | Double acting |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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.
Theoretical Output Force (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 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 MI25X120SU
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×120 | 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 MI25X120SU Is Used
Package Diverting Gate
Actuates a routing flap on a packaging conveyor, using the 245.3 N push force to redirect heavy cartons without stalling.
Vertical Parts Press
Pushes a light assembly into a fixture on an automated line, relying on the 120 mm stroke and fixed TPU bumpers to soften the end impact.
Washdown Valve Actuation
Triggers a stainless diverter valve in a damp food-processing zone, where the corrosion-resistant round body prevents rust failure.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X120SU the Right Cylinder?
When sizing this 25 mm bore, the neighbouring Ø20 generates 157.0 N of push at 0.5 MPa, whereas stepping up to the Ø32 yields 402.2 N. Choose this model when your load sits safely under the 12.5 kg vertical lift threshold. The 120 mm stroke is well within the 500 mm maximum, though extending the rod that far increases side-load vulnerability, so ensure your front mounting guides the load smoothly to prevent rod bending.
The U-type rear cover offers a 90-degree mounting pivot, but remember that a plain double-acting cylinder drifts if air pressure drops or the valve is centred. The TPU bumpers only decelerate the piston near the stroke end, so for fail-safe load holding you must add an external rod lock or a pilot-operated check valve.
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 MI25X120SU FAQ
This 25 mm bore cylinder features 1/8" air ports and an M10x1.25 male rod thread. It generates 245.3 N push and 206.1 N pull at 0.5 MPa, increasing to 343.4 N push and 288.5 N pull at 0.7 MPa. The theoretical maximum force is 50 kgf at 1.0 MPa.
Yes, the -S suffix denotes a built-in piston magnet compatible with CMSG, DMSG and EMSG switches. For deceleration, it relies on fixed TPU bumper pads at both ends, which absorb impact but are not an adjustable air cushion.
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