Airtac MI25~40 Stainless Steel Mini Cylinder MI25X55SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI25X55SU is a genuine double acting round-body mini air cylinder with a Ø25mm bore and 55mm 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
- Stroke55 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 MI25X55SU
Delivering 245.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles demanding actuation with ease. The Ø25 bore operates on a 1/8" port and features a U-type 90-degree rear cover for compact pivot mounting. Its stainless barrel and piston rod resist mild corrosion, making it highly suitable for damp environments or washdown zones where painted steel or aluminium bodies degrade. Fixed TPU bumper pads absorb the impact at stroke extremes, decelerating the motion smoothly without the need for adjustable cushioning.
Because the piston carries a magnet (-S), this unit directly supports CMSG, DMSG and EMSG position switches for precise end-of-stroke detection. For practical sizing, plan for a safe working load of about 147 N, which leaves a healthy margin below the rated capacity. In vertical lifting scenarios, this translates to lifting roughly 12.5 kg safely with a 2:1 factor, letting you match the cylinder to real part weights instantly. The 55 mm stroke keeps the retracted length highly compact while providing ample travel for clamping or ejecting tasks.
Airtac MI25~40 Stainless Steel Mini Cylinder MI25X55SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI25X55SU |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 55 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 MI25X55SU
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×55 | 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 MI25X55SU Is Used
Package Diverting Gate
Provides the 245 N push needed to snap a diverting gate on a packaging conveyor, redirecting cartons at high speed without lagging.
Lab Washdown Station
The stainless steel construction survives repetitive moisture and chemical splash in laboratory rinse stations, extending service life over aluminium alternatives.
Parts Ejector Press
Uses the 55 mm stroke to kick stamped metal parts out of a small press bed rapidly, relying on the U cover for stable pivot action during ejection.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X55SU the Right Cylinder?
When sizing this 25 mm bore, compare it directly against its neighbours: a 20 mm bore yields 157.0 N of push at 0.5 MPa, while stepping up to a 32 mm bore provides 402.2 N. Choose this model when your application requires around 245 N of thrust but cannot accommodate the larger footprint of the 32 mm variant. The built-in magnet pairs seamlessly with CMSG, DMSG or EMSG sensors, and the U-type back cover simplifies 90-degree pivot mounting.
Remember that standard pneumatic operation cannot hold a load if air pressure drops or the valve is centred, as the piston will drift and the TPU pads only soften the end stops rather than acting as a brake. To suspend a load safely mid-stroke, incorporate an external rod lock or a pilot-operated check valve into your circuit. Additionally, the 55 mm stroke is well within standard limits, keeping rod-bending side-load risks low even at high cycling speeds up to 800 mm/s.
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 MI25X55SU FAQ
This double-acting cylinder delivers a push of 245.3 N and a pull of 206.1 N at 0.5 MPa. At 0.7 MPa, the push increases to 343.4 N and the pull to 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa, and the air port size is 1/8".
No, it uses fixed TPU bumper pads to decelerate at the stroke ends, not an adjustable air cushion. It also cannot hold a load if air is lost; the piston will drift. You must add an external rod lock or pilot check valve for position holding.
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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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