Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400U is a genuine double acting round-body mini air cylinder with a Ø25mm bore and 400mm 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
- Stroke400 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 MI25X400U
Delivering 245.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles substantial work over a 400 mm travel. The riveted stainless barrel and Ø10 mm rod shrug off mild corrosion, making it a hardier choice than painted alternatives in damp or washdown-prone environments. Its 1/8" port and M10x1.25 male rod thread provide robust pneumatic and mechanical interfaces for heavier tooling.
Because it conforms to ISO 6432 mounting dimensions, the body drops directly into standard mini-cylinder brackets and clevises. For real-world sizing, plan for a safe working load of roughly 147 N (about 60 percent of the 0.5 MPa rating), which translates to lifting a 12.5 kg part vertically with a 2:1 safety margin. This SKU lacks a magnet, so it cannot host CMSG, DMSG or EMSG sensors without switching to the -S version.
Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400U |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 400 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 MI25X400U
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×400 | 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 MI25X400U Is Used
Package Divert Gate
Swings a heavy routing flap on a logistics sorting line, using its 245.3 N thrust to deflect parcels reliably over a 400 mm arc.
Parts Lowering Arm
Lowers a 12.5 kg machined casting from an overhead conveyor to an assembly fixture, safely managing the vertical descent.
Washdown Reject Pusher
Ejects failed containers in a damp food-packaging plant, relying on the stainless barrel to withstand daily moisture exposure.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400U the Right Cylinder?
When sizing this 25 mm bore, the neighbouring Ø20 generates 157.0 N of push at 0.5 MPa, while the larger Ø32 provides 402.2 N, giving you clear boundaries if your payload shifts. The U-style back cover mounts at 90 degrees, orienting the rear port neatly for inline manifold layouts on tight machines. Over a 400 mm extension, minimize side-loading to prevent rod bending and premature seal wear.
Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not act as a brake. If the air supply drops or the valve centers, the piston will drift, so fit an external rod lock or pilot-operated check valve to suspend any vertical load safely.
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 MI25X400U FAQ
At 0.5 MPa it pushes with 245.3 N and pulls with 206.1 N. At 0.7 MPa the push is 343.4 N and pull is 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa. The air port is 1/8" and the male rod thread is M10x1.25.
Yes, the Ø25 bore uses standard ISO 6432 mounting dimensions, so it fits generic mini-cylinder clevises and foot brackets. However, because this specific SKU lacks a magnet, you cannot mount CMSG, DMSG or EMSG switches on it; you would need the MI25X400U-S variant for position sensing.
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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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