Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400R 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 MI40X400R
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty linear motion across its 400 mm stroke. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown settings. It carries an R back cover, meaning the rear air supply connects via an axial-in port to keep hose routing inline with the body.
Because the bore is Ø40, it sits outside the ISO 6432 standard dimensions, operating purely as a robust riveted round-body actuator rather than a drop-in mini bracket size. For actual work planning, target a safe load of about 377 N, which equates to lifting roughly 32 kg vertically with a 2:1 safety margin. The 1/4" port feeds air efficiently to maintain speeds of 30-800 mm/s, while fixed TPU bumper pads absorb the impact at stroke ends.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400R |
|---|---|
| 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 MI40X400R
| 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 MI40X400R Is Used
Heavy Package Diverting
Uses the 628.3 N push force to deflect heavy cartons on a stainless-steel washdown conveyor line where axial rear porting keeps hoses safely inline.
Pneumatic Pressing Station
Applies up to 879.6 N at 0.7 MPa to seat bearings or stamp light components, relying on the fixed TPU bumpers to soften the end-of-stroke impact.
Pallet Gate Actuation
Drives a 400 mm travel to open and close heavy access gates in damp storage environments, safely moving loads under 32 kg without position holding.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400R the Right Cylinder?
Sizing this actuator requires looking both ways: stepping down to the Ø32 bore drops the 0.5 MPa push force to 402.2 N, while no larger MI series exists above Ø40 if you need more than the 879.6 N generated here at 0.7 MPa. The 400 mm stroke is substantial for this diameter, so ensure your mounting configuration—whether LB foot, FA flange, or TC trunnion—prevents rod side-loading and bending during the long travel. This specific SKU lacks the -S magnet, meaning it cannot accept CMSG, DMSG, or EMSG position switches; you would need the -S variant for electronic sensing.
Keep in mind that the fixed TPU bumpers only decelerate the piston near the stroke end; they do not function as an adjustable air cushion like the MIC variant. Furthermore, a standard double-acting cylinder drifts when air pressure is lost or the valve is centered. If your application must hold a load statically during an air failure, 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 MI40X400R FAQ
This 40 mm bore cylinder features a 1/4" air port and a Ø16 mm rod with an M12x1.25 male 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, this specific SKU does not include the -S magnet option, so it cannot accept CMSG, DMSG, or EMSG switches. You must select an MI40 model with the -S suffix for electronic sensing. The stainless build resists mild corrosion, but note that Ø40 is a non-ISO-6432 round-body size.
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Covers non-human-caused product damage.
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