Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225R is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 225mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke225 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 MI40X225R
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty tasks within a compact footprint. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel alternatives degrade. An R back cover integrates an axial-in port to streamline your pneumatic plumbing layout.
At 0.5 MPa, you can plan for a safe working load of about 377 N, which equates to lifting a 32 kg part vertically with a 2:1 safety margin. The riveted construction houses fixed TPU bumper pads that absorb stroke-end impact across the 225 mm travel. Note that this specific SKU lacks a magnet, so it cannot support CMSG, DMSG or EMSG position switches without upgrading to an -S variant.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225R |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 MI40X225R
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 MI40X225R Is Used
Stamping Press Feed
Pushes heavy metal blanks into a small stamping press using the full 628.3 N thrust at 0.5 MPa, with the 225 mm stroke providing ample reach across the feed bed.
Bottle Diverter Gate
Actuates a heavy stainless-steel routing gate on a washdown filling line, where the corrosion-resistant barrel survives constant moisture and cleaning chemicals.
Pallet Case Pusher
Sweeps packed cardboard cases onto a pallet at the end of a packaging conveyor, safely moving loads under the 377 N safe working threshold.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X225R the Right Cylinder?
Sizing this 40 mm bore against its neighbours helps match your air system: the Ø32 bore provides 402.2 N push at 0.5 MPa, while the Ø40 shown here outputs 628.3 N. As the largest available standard MI size, stepping up beyond this requires a different cylinder family entirely. The 225 mm stroke is well within the 500 mm maximum, though maintaining proper guide alignment is critical to prevent rod bending over that travel length.
Because the base MI relies on fixed TPU bumpers rather than an adjustable air cushion, consider the MIC variable-cushion variant if your application runs at high cycling speeds. Furthermore, a standard double-acting cylinder drifts when air pressure is lost or the valve is centred—the bumpers only decelerate the end of stroke and act purely as impact absorbers, never as a locking mechanism. To suspend a load safely during an emergency stop, fit 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 MI40X225R FAQ
The 40 mm bore generates a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa. At 0.7 MPa, push is 879.6 N and pull is 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa. Air is supplied via a 1/4 inch port, and the male rod thread is M12x1.25.
No, this specific SKU does not include a piston magnet, so it cannot accept CMSG, DMSG or EMSG magnetic switches. You must select an MI40X225R-S variant to enable switch sensing. The unit uses fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion.
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