Airtac MI25~40 Stainless Steel Mini Cylinder MI40X75U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X75U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 75mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke75 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 MI40X75U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles substantial work. The stainless-steel barrel and rod resist mild corrosion, making it highly suitable for damp washdown environments where painted steel alternatives degrade. Riveted construction keeps the unit compact, while fixed TPU bumper pads absorb impact energy at the stroke ends. Air arrives via a 1/4" port, driving a Ø16 mm piston rod with an M12x1.25 male thread.
For practical sizing, plan for roughly 377 N of real work at 0.5 MPa, which safely accounts for friction and dynamic load variations. This translates to lifting about 32 kg vertically when applying a 2:1 safety margin. The rear U cover provides a 90-degree port orientation, simplifying hose routing in tight machinery. Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X75U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X75U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 MI40X75U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 MI40X75U Is Used
Stamping Press Ejection
Uses the 628.3 N push force at 0.5 MPa to knock heavy stamped metal parts out of a die, relying on the stainless body to resist cutting fluid splash.
Vertical Parts Press
Pushes bearings or pins into housings on an assembly line, safely lifting about 32 kg of tooling weight with a 2:1 safety margin during the downward stroke.
Heavy Package Diverter
Swings a heavy-duty deflector plate on a logistics conveyor, using the 90-degree U cover to keep the 1/4" air hose neatly routed away from the moving belt.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X75U the Right Cylinder?
When sizing this 40 mm bore, compare its 628.3 N push force at 0.5 MPa against the smaller Ø32 bore, which yields 402.2 N under identical pressure. If you require even more power, the MI series tops out here, so exceeding this capacity means exploring larger profiles. The 75 mm stroke keeps the rod short, minimizing side-load bending moments, but always ensure rigid mounting using LB foot, FA flange, SDB pivot, or TC trunnion hardware. Remember that fixed TPU bumpers only decelerate the end of travel; they do not act as a brake. If your application must prevent drift upon air loss or valve centering, install an external rod lock or a pilot-operated check valve, as the piston will otherwise move.
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 MI40X75U FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa. This 40 mm bore cylinder uses a 1/4" air port.
No, this specific SKU does not include the -S magnet, so it cannot accept CMSG, DMSG, or EMSG switches. You would need the -S variant for sensing. The unit features fixed TPU bumper pads for end-of-stroke deceleration, not an adjustable air cushion, and its stainless round-body design omits ISO 6432 dimensions at this 40 mm size.
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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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