Airtac MI25~40 Stainless Steel Mini Cylinder MI40X450SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X450SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 450mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke450 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 MI40X450SU
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles substantial actuation tasks within a compact footprint. The stainless-steel barrel and rod resist mild corrosion, making it highly suitable for damp environments or washdown zones where painted steel alternatives degrade. A 1/4" port supplies air to the 40 mm bore, while fixed TPU bumper pads absorb the impact at stroke extremes.
Because the rod must travel 450 mm, planning for around 377 N of real work at 0.5 MPa prevents premature failure from friction and side loads. This equates to lifting about 32 kg vertically with a safe 2:1 margin. The U-type back cover provides a 90-degree port orientation for tight machinery layouts, and the built-in magnet (-S) supports CMSG, DMSG and EMSG switches for end-of-stroke confirmation.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X450SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X450SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 450 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 MI40X450SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 MI40X450SU Is Used
Heavy Package Diverting
Pushes heavy cartons on a distribution line using its 628.3 N push force at 0.5 MPa, with the U cover keeping pneumatic lines neatly routed at 90 degrees.
Washdown Sorting Gate
The stainless-steel construction survives humid food-processing washdowns, actuating a 450 mm sorting gate where mild-steel bodies would rust.
Vertical Pallet Lift
Raises lightweight pallet components up to 32 kg vertically through a 450 mm stroke, operating comfortably within a 2:1 safety margin at 0.5 MPa.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X450SU the Right Cylinder?
When sizing this 40 mm bore unit, the adjacent 32 mm bore generates 402.2 N of push at 0.5 MPa, whereas this 40 mm option provides 628.3 N—useful if the smaller variant stalls under load. As the largest available round-body mini cylinder in this series, there is no larger standard bore to step up to, so applications requiring more than 879.6 N at 0.7 MPa will need a different frame size entirely. The 450 mm stroke demands careful guidance to prevent rod bending under side loads.
Remember that venting or losing air supply causes the piston to drift, as the fixed bumpers only soften the end-of-stroke impact rather than locking the rod. To suspend a load safely mid-stroke, integrate an external pilot-operated check valve or a dedicated rod lock. The -S magnet allows seamless fitting of CMSG, DMSG or EMSG sensors without extra hardware.
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 MI40X450SU FAQ
This 40 mm bore 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, 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, the piston will drift if air is lost or the valve is centred. The fixed TPU bumper pads only decelerate the rod near the stroke end; they do not act as a brake. To hold a suspended load, you must fit an external rod lock or a pilot-operated check valve.
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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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