Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SU 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 MI40X20SU
Generating a robust 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy short-stroke tasks. The stainless-steel barrel and Ø16 rod shrug off mild corrosion, making it superior to painted alternatives in damp washdown zones. Because this 40 mm bore exceeds standard mini dimensions, it is a non-ISO-6432 size, yet the riveted construction keeps it highly compact.
The built-in magnet (-S) directly supports CMSG, DMSG and EMSG switches for end-of-stroke detection. Its 1/4" port feeds air rapidly to achieve the 30-800 mm/s speed range. For practical sizing, plan for a safe working load of roughly 377 N, which means it can vertically lift about 32 kg with a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SU |
|---|---|
| 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 MI40X20SU
| 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 MI40X20SU Is Used
Short-Stroke Stamping
Executes compact 20 mm stamping or marking operations on metal parts using its substantial 628.3 N push force.
Heavy Diverter Gate
Actuates a robust routing flap on a packaging line, where the stainless build withstands regular washdowns.
Pallet Stopper Block
Raises a solid stop block to halt heavy pallets, safely managing loads up to the 32 kg vertical threshold.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X20SU the Right Cylinder?
This 40 mm bore sits at the top of the MI range; there is no larger standard size, so if 628.3 N at 0.5 MPa is insufficient, you must switch to a different cylinder family entirely. Dropping down to a Ø32 bore reduces the push force to 402.2 N. The U back cover provides a 90-degree port orientation for tight machinery layouts.
Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not function as a brake. If your setup must hold a vertical load when air is removed or the valve is centred, the piston will drift, so you must add 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 MI40X20SU FAQ
At 0.5 MPa it pushes with 628.3 N and pulls with 527.8 N. At 0.7 MPa the push is 879.6 N and pull is 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa. Air is supplied via a 1/4" port.
No, the piston will drift if air is lost or the valve is centred. The fixed TPU bumper pads only soften the stroke end and do not act as a locking brake. You must fit an external rod lock or pilot check valve to hold a load.
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1-Year Warranty
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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