Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 500mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke500 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 MI40X500U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation with a substantial 500 mm stroke. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown environments. Riveted construction keeps the assembly compact while fixed TPU bumper pads absorb the impact at stroke extremes. Because this 500 mm travel matches the maximum standard limit for the Ø40 bore, it provides extensive reach without requiring a custom order.
At 0.5 MPa, you can plan for roughly 377 N of actual work, which translates to lifting about 32 kg vertically with a safe 2:1 margin. The U-type back cover orients the 1/4 inch air port 90 degrees to the body, simplifying hose routing in tight machine cells. Note that this specific SKU lacks a magnet, so it cannot accept CMSG, DMSG or EMSG reed switches without upgrading to an -S variant.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 MI40X500U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 MI40X500U Is Used
Pallet Diverters
Pushes heavy pallets across transfer lines using the full 628.3 N thrust, while the 90-degree U cover keeps pneumatic hoses clear of the moving belt.
Case Erectors
Extends the full 500 mm stroke to fold and seal large corrugated cartons, relying on the stainless rod to withstand dusty, high-cycle packaging cells.
Vertical Lift Gates
Raises access doors weighing up to 32 kg safely, leveraging the 2:1 safety margin computed from the 0.5 MPa push rating for reliable vertical actuation.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500U the Right Cylinder?
When sizing this 40 mm bore, dropping down to a Ø32 model reduces the push force to 402.2 N at 0.5 MPa, while no larger AirTAC MI size exists above it. If your application demands the maximum 879.6 N push at 0.7 MPa, ensure your compressed air system can sustain that pressure reliably. For this 500 mm stroke, minimize side-loading to prevent rod bending and premature seal wear over such a long travel distance.
Remember that venting the air or centering the directional valve causes the piston to drift, as the TPU bumpers only decelerate the end-of-stroke impact and act as neither a brake nor a position lock. To suspend a vertical load safely during an air loss event, integrate an external pilot-operated check valve or a dedicated rod lock.
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 MI40X500U FAQ
The 1/4 inch ported, double-acting cylinder generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 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, this SKU lacks a piston magnet and cannot accept CMSG, DMSG or EMSG switches. You must select an -S variant for magnetic sensing. It uses fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion.
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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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