Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400SU 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 MI25X400SU
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 rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown settings. Because it carries the -S suffix, a built-in piston magnet is present, allowing you to bolt on CMSG, DMSG or EMSG reed and electronic switches for precise end-position detection.
Its Ø25 bore conforms to the ISO 6432 mounting interface, so it drops directly into standard mini-cylinder brackets and clevises without custom machining. The U-style back cover provides a 90-degree port and pivot orientation, simplifying plumbing in tight spaces. For practical sizing, plan for about 147 N of real work at 0.5 MPa, which means it can safely lift a 12.5 kg part vertically with a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400SU |
|---|---|
| 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 MI25X400SU
| 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 MI25X400SU Is Used
Pallet Divert Gate
Pushes packaging pallets sideways on a washdown conveyor line, using the 245 N thrust and 400 mm reach to clear the belt before retracting.
Parts Elevator Lowering
Lowers 10 kg metal stampings from an overhead press to an inspection chute, relying on the 90-degree U back cover for tidy downward plumbing.
Bin Pusher Array
Indexes loaded storage bins along gravity rollers in a humid cold-storage facility, where the stainless barrel prevents rust over long shifts.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X400SU the Right Cylinder?
When sizing this actuator, consider the neighbours in the range: the Ø20 bore provides 157 N of push at 0.5 MPa, while stepping up to the Ø32 yields 402 N. If your payload is under 15 kg and you need the long 400 mm extension, this Ø25 hits the sweet spot. Remember that a plain double-acting cylinder drifts when air is lost or the valve is centred; the fixed TPU bumper pads only decelerate the stroke end and do not act as a lock. To hold a vertical load securely, add an external rod lock or a pilot-operated check valve.
With a 400 mm stroke on a Ø10 mm rod, be mindful of side loads. The piston rod can bend if the load is not guided rigidly along its travel axis. The 1/8" port matches the bore size, and the fixed bumpers allow a cycle speed anywhere from 30 to 800 mm/s without slamming hard at the ends.
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 MI25X400SU FAQ
This Ø25 bore cylinder features a 1/8" air port and an M10x1.25 male rod thread. The double-acting thrust is 245.3 N push and 206.1 N pull at 0.5 MPa, or 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 means it has a built-in magnet for CMSG, DMSG and EMSG switches. For impact absorption, it uses fixed TPU bumper pads that decelerate the piston at the stroke ends; it does not have an adjustable air cushion (you would need the MIC variant for that).
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