Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400SCM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400SCM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 400mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke400 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 MI40X400SCM
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 Ø16 mm piston rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel bodies would degrade. A 1/4" port supplies the air volume needed for the larger bore, while fixed TPU bumper pads absorb the impact at stroke extremes without offering adjustable cushioning.
For practical sizing, plan for a safe working load of roughly 377 N, which represents about 60 percent of the 0.5 MPa push rating. In vertical lifting scenarios, this translates to hoisting approximately 32 kg safely when applying a 2:1 mechanical margin. The built-in magnet enables CMSG, DMSG and EMSG switches for position detection, and the CM round end cover completes the rear assembly.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400SCM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400SCM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 MI40X400SCM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 MI40X400SCM Is Used
Heavy Package Diversion
Pushes heavy cartons weighing up to 32 kg onto secondary packaging lines using the 628.3 N push force available at 0.5 MPa.
Stamping Ejector
Ejects formed metal or plastic parts from press dies, relying on the stainless construction to withstand oily and mildly corrosive shop environments.
Pallet Positioning Gate
Actuates 400 mm to open and close heavy load-diverter gates on pallet conveyors, using the CM round end cover for straightforward rear mounting.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400SCM the Right Cylinder?
When sizing this 40 mm bore actuator, the adjacent Ø32 bore provides 402.2 N of push at 0.5 MPa if your application requires less force, but there is no larger standard MI series option available for heavier demands. Because this unit features a 400 mm stroke, carefully manage side loading to prevent piston rod bending and premature seal wear over that extended length. The integrated -S magnet allows seamless fitting of CMSG, DMSG or EMSG sensors for end-of-stroke confirmation. Remember that venting the air supply or centering the control valve will cause the piston to drift, as the TPU bumpers only decelerate the end-of-stroke impact and cannot function as a locking brake; install an external rod lock or pilot-operated check valve if you must hold a load securely in place.
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 MI40X400SCM FAQ
This 40 mm bore cylinder uses a 1/4" port and a 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.
No, the piston will drift if air is lost or the valve is centered. The fixed TPU bumper pads only decelerate the rod near the stroke ends and do not act as a brake. You must add an external rod lock or pilot check valve to maintain a vertical position.
Authorized Export Seller
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.
Fast Reply
Most inquiries answered within 7-8 hours.
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