Airtac MI25~40 Stainless Steel Mini Cylinder MI40X90SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X90SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 90mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke90 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 MI40X90SU
Delivering serious force for a compact footprint, the AirTAC MI40X90SU is a double-acting round-body mini cylinder built around a 40 mm bore and a 90 mm stroke. The stainless-steel barrel and piston rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel or aluminium bodies would degrade. It pushes with 628.3 N and pulls with 527.8 N at 0.5 MPa, scaling up to 879.6 N and 738.9 N respectively at 0.7 MPa. The 1/4" port feeds air efficiently to match this higher output class.
Because raw ratings rarely translate perfectly to real-world friction, you should plan for a safe working load of roughly 377 N, which is about 60 percent of the 0.5 MPa push figure. In vertical lifting setups, this equates to hoisting approximately 32 kg safely with a 2:1 margin. This SKU includes a built-in piston magnet for position sensing and features a U-type back cover that orients the rear port at 90 degrees for tight manifold routing.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X90SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X90SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 90 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 MI40X90SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 MI40X90SU Is Used
Pallet Diverting Gate
Actuates a heavy routing flap on a packaging line, using the 628.3 N push force to reliably shove loaded pallets onto a secondary track without stalling.
Stamping Press Feed
Pushes mild steel blanks into a forming die at 90 mm stroke, where the stainless construction withstands residual cutting fluid and the U-cover keeps hoses clear.
Carton Flap Folder
Drives a mechanical arm to tuck heavy cardboard flaps on outbound shipping boxes, relying on the 527.8 N pull force to retract the tooling quickly.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X90SU the Right Cylinder?
Sizing this 40 mm bore is straightforward when you map the force needs to the task. If 628.3 N of push at 0.5 MPa is excessive for your cycle, stepping down to the 32 mm bore drops the output to 402.2 N, saving air volume. Since 40 mm is the largest standard MI round-body mini cylinder size, moving beyond this 879.6 N @0.7 MPa threshold requires switching to a larger profile series entirely. The 90 mm stroke keeps the rod side-load stress minimal, but always ensure rigid front mounting to prevent rod bending.
The integrated -S magnet allows direct mounting of CMSG, DMSG, or EMSG electronic switches for end-of-stroke confirmation. Remember that the fixed TPU bumper pads only decelerate the piston near the stroke end; they do not function as a brake. If your application must prevent drift on air loss or valve centering, you must add an external rod lock or a pilot-operated check valve to hold the load securely.
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 MI40X90SU FAQ
This 40 mm bore cylinder features a 1/4" air port and an M12x1.25 male rod thread. 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.
Because it is a 40 mm bore, it exceeds the ISO 6432 standard range, so you must use its native round-body mounting accessories like LB foot or FA flange brackets rather than ISO mini-cylinder clevises. However, the -S suffix denotes a built-in magnet, allowing you to mount CMSG, DMSG, or EMSG switches directly for position detection.
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Covers non-human-caused product damage.
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