Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 350mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke350 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 MI40X350U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation tasks. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, making it superior to painted alternatives in damp washdown environments. It features a 1/4" port and an M12x1.25 male rod thread.
The 350 mm stroke operates at 30-800 mm/s, relying on fixed TPU bumper pads to decelerate the impact at stroke ends. Plan for a safe working load of roughly 377 N, which translates to lifting about 32 kg vertically with a 2:1 safety margin. The U back cover provides a 90-degree port and mounting orientation for tight spaces.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 MI40X350U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 MI40X350U Is Used
Pallet Diverter Gate
Actuates heavy routing gates on packaging lines, using its 628.3 N thrust to push loaded pallets onto secondary conveyors.
Press Fit Station
Drives bushings into automotive housings, where the 350 mm stroke accommodates varying part heights and the U cover eases side mounting.
Heavy Carton Lid Closer
Pulls large shipping container flaps shut, leveraging the 527.8 N pull force at 0.5 MPa to seal heavy gauge corrugated boxes.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350U the Right Cylinder?
Sizing this 40 mm bore against its neighbours helps match your air supply: stepping down to the Ø32 bore drops the 0.5 MPa push force to 402.2 N, while the Ø40 is the largest available in this series. Because this SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG sensors for position detection.
At 350 mm of travel, minimize side loads to prevent rod bending and premature seal wear. Note that the bumper pads only soften the end-of-stroke impact; they do not function as a lock. If your application must hold a load vertically during air loss or valve centering, the piston will drift, requiring an external rod lock or pilot-operated check valve.
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 MI40X350U FAQ
This 40 mm bore cylinder features a 1/4" port. At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it delivers 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 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 for sensor compatibility. It uses fixed TPU bumper pads for deceleration, not an adjustable air cushion.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
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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