Airtac MI25~40 Stainless Steel Mini Cylinder MI25X40R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI25X40R is a genuine double acting round-body mini air cylinder with a Ø25mm bore and 40mm 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
- Stroke40 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 MI25X40R
Delivering 245.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles substantial work in a compact footprint. The Ø25 mm bore uses a 1/8" air port and an M10x1.25 male rod thread. Its stainless barrel and rod naturally resist mild corrosion, giving it a real edge over painted steel in damp or washdown environments. Fixed TPU bumper pads absorb the impact at stroke extremes, decelerating the piston smoothly without the complexity of adjustable cushioning.
Because the 245.3 N rating is a theoretical maximum, you should plan for a safe working load of about 147 N of actual work at 0.5 MPa. For vertical lifting, that same 0.5 MPa push force equals roughly 25 kgf, so applying a 2:1 safety margin means it lifts about 12.5 kg safely. This specific R-style configuration features an axial-in rear port to streamline your plumbing layout. Note that because this SKU lacks the -S magnet option, it cannot accept CMSG, DMSG, or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI25X40R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI25X40R |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 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 MI25X40R
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MI25X40R Is Used
Package Diverting Gate
Actuates a routing flap on a packaging line, using its 245.3 N push force to swing heavy cardboard cartons onto secondary tracks at high speed.
Pallet Stopper Arm
Extends 40 mm to block incoming pallets at a wrapping station, absorbing the kinetic impact through its fixed TPU bumper pads.
Clamp Actuator
Secures aluminum extrusions during a cutting operation, providing reliable clamping pressure in environments where metal shavings would damage extruded profiles.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI25X40R the Right Cylinder?
When sizing this actuator, compare it against its neighbors: a Ø20 bore provides 157.0 N of push at 0.5 MPa, while stepping up to a Ø32 yields 402.2 N. The Ø25 hits a sweet spot for medium-force tasks. Its 40 mm stroke is well within the 500 mm maximum standard stroke for this bore, keeping the assembly rigid and minimizing rod bending under side loads. The ISO 6432 mounting interface on this Ø25 bore means it drops directly into standard mini-cylinder brackets and clevises.
Keep in mind that a standard double-acting cylinder like this relies entirely on continuous air pressure to maintain its position. If the valve is centered or air is lost, the piston will drift, and the TPU bumpers only soften the end-of-stroke impact rather than acting as a brake. To suspend a load safely mid-stroke, you must integrate an external rod lock or a pilot-operated check valve into your pneumatic circuit.
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 MI25X40R FAQ
This double-acting cylinder uses a 1/8" air port. At 0.5 MPa it pushes with 245.3 N and pulls with 206.1 N. At 0.7 MPa, push increases to 343.4 N and pull to 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG, or EMSG switches. You would need the -S variant (MI25X40R-S) to enable magnetic sensing. The unit relies on fixed TPU bumper pads for end-of-stroke deceleration and conforms to ISO 6432 mounting dimensions for Ø25 bores.
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