Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 250mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke250 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 MI40X250SU
Delivering 628.3 N of push force at 0.5 MPa, the AirTAC MI40X250SU is a robust double-acting round-body mini cylinder built for heavy-duty automation. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion and washdown environments better than painted alternatives. A 1/4" port supplies the air, while fixed TPU bumper pads absorb the impact at stroke extremes. Because the U suffix provides a 90-degree rear cover, plumbing stays tight to the machine frame.
With a 250 mm stroke, this riveted unit handles substantial reach without needing a bulky profile body. Plan for roughly 377 N of actual work at 0.5 MPa to maintain a safe margin, which translates to lifting about 32 kg vertically. The built-in magnet (-S) directly supports CMSG, DMSG and EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MI40X250SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MI40X250SU Is Used
Pallet Diversion Gate
Harness the 628.3 N push force to swing heavy pallet diversion gates on packaging lines, relying on the stainless rod to withstand dusty washdowns.
Parts Press Fixture
Drive a 250 mm downward stroke to press bearings into housings, using the fixed TPU bumpers to soften the end-of-stroke impact during assembly.
Vertical Material Lift
Lift approximately 32 kg of stacked components between conveyor tiers, fitting CMSG sensors to the magnetic piston for precise tier detection.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SU the Right Cylinder?
When sizing this 40 mm bore, compare it against the adjacent 32 mm option, which yields 402.2 N of push at 0.5 MPa, or step up if your application requires the full 628.3 N this larger bore provides. The 250 mm stroke demands careful alignment; any side-load on the extended rod invites premature seal wear and bending, so rigid guidance is essential. If your process demands position holding upon air loss, remember this cylinder will drift—a pilot-operated check valve or external rod lock is required to secure the load.
Mounting flexibility comes from the 90-degree U back cover, and you can deploy CMSG, DMSG or EMSG sensors thanks to the integrated magnet. The fixed TPU bumpers decelerate the piston at the ends, but for high-speed cycles generating significant kinetic energy, consider the MIC variable cushion variant instead.
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 MI40X250SU FAQ
This 40 mm bore cylinder features a 1/4" air port and a Ø16 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 centered, as the TPU bumpers only decelerate the stroke end and do not act as a brake. To secure a suspended load, you must install an external rod lock or a pilot-operated check valve.
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Genuine AirTAC parts produced by AirTAC factory.
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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