Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 20mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke20 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 MI40X20U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty tasks in tight spaces. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, making it superior to painted alternatives in damp or washdown environments. It features a 1/4" port and a 90-degree U back cover for compact side-mounting. Fixed TPU bumper pads absorb end-of-stroke impact without offering adjustable cushioning.
For practical sizing, plan for a safe working load of roughly 377 N, which is about 60 percent of the 0.5 MPa push rating. This equates to lifting a 32 kg part vertically with a safe 2:1 margin. Because this SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches; choose a -S variant if you require electronic sensing.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 MI40X20U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MI40X20U Is Used
Stamping Pin Actuation
Drives a heavy marking pin in an end-of-line metal stamping station, utilizing the 628.3 N push force to imprint thick gauge steel.
Pallet Diverter Gate
Pivots a heavy divert gate on a packaging conveyor, where the 90-degree U cover and short 20 mm stroke fit neatly into the frame.
Washdown Clamp
Secures stainless-steel fittings during a high-pressure washdown cycle, relying on the corrosion-resistant barrel to withstand constant moisture.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20U the Right Cylinder?
As the largest bore in the MI family, the 40 mm size sits at the top of the range with no larger standard option available; if your application requires less power, stepping down to the Ø32 bore provides 402.2 N of push at 0.5 MPa. The 20 mm stroke keeps the retracted length highly compact, minimizing rod-bending side loads. With a U-style 90-degree rear cover, mounting is oriented for tight corner installations. Remember that the fixed TPU bumpers only decelerate the piston near the stroke end; they do not act as a brake. If your machine drops air pressure or the valve is centred, the rod will drift, so fit an external rod lock or pilot-operated check valve to suspend a 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 MI40X20U FAQ
This 40 mm bore cylinder uses a 1/4" air port. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
No, this specific SKU does not include a magnet, so CMSG, DMSG or EMSG switches will not function on it. You must select an MI40 model with the -S suffix to enable magnetic position sensing.
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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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