Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40CM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40CM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 40mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke40 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 MI40X40CM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy compact automation tasks. The stainless-steel barrel and rod resist mild corrosion and washdown, outperforming painted alternatives in damp environments. It features a CM round end cover and a 1/4 inch air port. Fixed TPU bumper pads absorb stroke-end impact to protect the mechanism.
For practical sizing, plan for a safe working load of about 377 N, which is roughly 60 percent of the 0.5 MPa rating. This translates to lifting a 32 kg part vertically with a two-to-one safety margin. Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40CM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40CM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 MI40X40CM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MI40X40CM Is Used
Stamping Press Feed
Pushes heavy gauge metal blanks into a compact stamping press, using the 628.3 N push force to overcome spring-loaded guide resistance.
Pallet Corner Guide
Actuates a heavy steel corner guide to align inbound pallets on a washdown conveyor belt, relying on the stainless steel construction to resist moisture.
Carton Flap Folder
Folds thick corrugated carton flaps on a high-speed packaging line, where the fixed TPU bumper pads absorb the repeated stroke-end impact.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40CM the Right Cylinder?
As the largest bore in the series, there is no larger standard MI size to step up to. If you need less force, stepping down to the Ø32 bore drops the 0.5 MPa push force to 402.2 N. This 40 mm bore uses a 1/4 inch port and an M12x1.25 male rod thread. The 40 mm stroke is well within the 500 mm maximum, keeping the rod highly resistant to bending under side loads.
Remember that venting the air supply causes the piston to drift, as the TPU bumpers only decelerate the stroke end rather than locking the rod. You must add an external rod lock or a pilot-operated check valve to hold a suspended load safely.
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 MI40X40CM FAQ
The 1/4 inch ported 40 mm bore 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 the internal magnet so it cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for sensing. It is a non-ISO-6432 round-body cylinder with a CM round end cover.
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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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Most inquiries answered within 7-8 hours.
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