Airtac MI25~40 Stainless Steel Mini Cylinder MI25X550SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI25X550SU is a genuine double acting round-body mini air cylinder with a Ø25mm bore and 550mm 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
- Stroke550 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM10×1.25
- 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 MI25X550SU
Delivering 245.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles demanding linear motion. The 550 mm stroke is a made-to-order length, exceeding the 500 mm standard maximum for the Ø25 bore to provide extended reach. Its stainless barrel and piston rod naturally resist mild corrosion, outperforming painted alternatives in damp or washdown settings. Equipped with a 1/8" port and an M10x1.25 male rod thread, it integrates smoothly into existing pneumatic setups.
Because it carries an -S suffix, a built-in piston magnet allows position sensing with CMSG, DMSG or EMSG switches. The U-style back cover provides a 90-degree port orientation for tight routing. Plan for roughly 147 N of actual work at 0.5 MPa, which translates to lifting about 12.5 kg vertically with a 2:1 safety margin. Fixed TPU bumper pads absorb end-of-stroke impacts to protect the mechanism.
Airtac MI25~40 Stainless Steel Mini Cylinder MI25X550SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI25X550SU |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 550 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 MI25X550SU
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×550 | 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 MI25X550SU Is Used
Extended Transfer Pushing
Uses the 550 mm stroke to push heavy cardboard cartons between conveyor lanes, relying on the 245 N force to overcome friction without stalling.
Vertical Parts Diverter
Lowers lightweight aluminum fixtures down a packaging chute, safely lifting or lowering parts up to 12.5 kg with a 2:1 safety margin.
Damp Environment Actuation
Actuates a sliding door on a food washdown line where the stainless steel rod and barrel prevent mild corrosion from constant moisture.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X550SU the Right Cylinder?
Choosing this specific unit means sizing both ways: a Ø20 bore provides 157 N push at 0.5 MPa, while a larger Ø32 offers 402 N, making the Ø25 a solid middle ground for 245 N loads. The 550 mm stroke is non-standard and made-to-order; at this extended length, carefully manage side loads to prevent rod bending and premature seal wear. The ISO 6432 mounting interface lets you drop this cylinder directly into standard mini-cylinder brackets and clevises.
Remember that a plain cylinder drifts when air is lost or the valve is centred, as the TPU pads only decelerate the stroke end rather than locking the load. For vertical or suspended loads that must hold position, install an external rod lock or a pilot-operated check valve. The U back cover and -S magnet are already configured for 90-degree fitting and sensor tracking.
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 MI25X550SU FAQ
At 0.5 MPa it pushes 245.3 N and pulls 206.1 N. At 0.7 MPa it pushes 343.4 N and pulls 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa. The air port size is 1/8" and the male rod thread is M10x1.25.
No, a plain cylinder drifts if air pressure is lost; the fixed TPU bumper pads only decelerate the stroke end and do not act as a lock. Use an external rod lock or pilot check valve for holding. The U back cover provides a 90-degree port orientation, and the -S magnet enables CMSG/DMSG/EMSG sensors.
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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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