Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125SUTC
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125SUTC is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 125mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke125 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- 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 MI40X125SUTC
Delivering a robust 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation tasks. The Ø40 bore operates with a 1/4" port and a 16 mm piston rod. Its stainless-steel barrel and rod resist mild corrosion, making it highly suitable for damp or washdown environments where painted steel alternatives fail. Fixed TPU bumper pads absorb the impact at stroke extremes, decelerating the piston smoothly without the need for adjustable cushioning.
Because the 628.3 N rating represents an ideal maximum, you should plan for a safe working load of roughly 377 N to account for friction and pressure drops in real setups. For vertical lifting, that translates to hoisting about 32 kg safely with a 2:1 margin. The built-in magnet (-S) directly supports CMSG, DMSG and EMSG position switches, while the U rear cover provides a 90-degree port orientation. This specific configuration also includes a TC trunnion mount for pivoting articulation.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125SUTC Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125SUTC |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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. Note: the Ø40 bore is a larger, non-ISO-6432 size.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MI40X125SUTC
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MI40X125SUTC Is Used
Heavy Package Diversion
Pushes heavy cartons weighing up to 32 kg onto secondary packaging lines, utilizing the full 628.3 N thrust at 0.5 MPa without risking frame damage.
Pneumatic Pressing Station
Applies steady downward clamping pressure for assembling bearings or pins, relying on the TC trunnion to accommodate slight misalignments during the stroke.
Washdown Sorting Gate
Actuates stainless-steel routing gates in damp food-processing zones, where the corrosion-resistant barrel survives frequent moisture exposure better than standard models.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125SUTC the Right Cylinder?
When sizing this Ø40 actuator, evaluate your force margins carefully. If your application requires less push, stepping down to the Ø32 bore provides 402.2 N at 0.5 MPa, which may save space and air consumption. Since Ø40 is the largest available bore in this series, moving up in force would require switching to an entirely different cylinder family. The 125 mm stroke is well within the 500 mm maximum standard limit, keeping the rod bending risk low, though side loads should still be minimized through proper guiding.
The TC trunnion mount pairs with the U back cover to support articulated or pivoting loads. Remember that the fixed TPU bumpers only soften the end-of-stroke impact; they do not function as a brake. If your system loses air or the valve is centered, the piston will drift, so you must add an external rod lock or a pilot-operated check valve to hold a suspended load securely in place.
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 MI40X125SUTC FAQ
This double-acting cylinder features a 1/4" port and a 16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum force of 128.1 kgf at 1.0 MPa.
Yes to sensors, no to adjustable cushions. The -S suffix denotes a built-in magnet for CMSG, DMSG or EMSG switches. For deceleration, it relies on fixed TPU bumper pads rather than adjustable air cushioning; if you need variable cushioning, look at the MIC variant.
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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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