Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SCM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SCM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke300 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 MI40X300SCM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles heavy-duty actuation where compact dimensions still matter. The Ø40 bore operates on a 1/4" port and relies on fixed TPU bumper pads to decelerate the piston at stroke ends rather than adjustable air cushions. Because the 300 mm stroke length is well within the 500 mm maximum for this bore, it ships as a standard configuration with a CM round end cover.
The stainless-steel barrel and rod resist mild corrosion, giving this unit a distinct advantage over painted alternatives in damp or washdown environments. 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) supports CMSG, DMSG, and EMSG position switches for electronic feedback.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SCM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SCM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MI40X300SCM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MI40X300SCM Is Used
Heavy Package Diverting
Pushes heavy cartons on a washdown packaging line, using the 628.3 N push force to deflect items onto a secondary belt without stalling.
Vertical Material Lift
Lifts a 32 kg fixture vertically in an assembly jig, utilizing the safe 2:1 working margin derived from the 0.5 MPa thrust rating.
Gate Actuation
Opens and closes a stainless-steel process gate in a damp food facility, relying on the corrosion-resistant barrel and CM round end cover.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SCM the Right Cylinder?
Sizing this 40 mm bore requires checking both neighbours: stepping down to the Ø32 bore drops the 0.5 MPa push force to 402.2 N, while the Ø40 is the largest available in this series, so no larger standard AirTAC MI option exists for higher loads. The 300 mm stroke is substantial, so ensure your mounting arrangement—whether LB foot, FA flange, or TC trunnion—prevents rod side-loading and bending over that extended travel distance.
Remember that a plain double-acting cylinder drifts when air pressure is lost or the valve is centered; the TPU bumpers only soften the end-of-stroke impact and will not function as a brake. If your application requires the load to stay put during an air loss event, install an external rod lock or a pilot-operated check valve.
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 MI40X300SCM FAQ
This double-acting cylinder uses a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
No, this base MI model features fixed TPU bumper pads that decelerate the stroke end, not an adjustable air cushion (see the MIC variant for that). However, the -S magnet allows you to mount CMSG, DMSG, or EMSG switches for position sensing.
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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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