Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400CM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400CM 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 MI40X400CM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation with a 400 mm stroke. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel degrades. Riveted construction keeps the unit compact, while fixed TPU bumper pads absorb the impact at stroke extremes.
Air enters via a 1/4 inch port to drive the M12x1.25 male rod thread. Plan for a safe working load of roughly 377 N, which is about 60 percent of the 0.5 MPa rating. In vertical lifting setups, this translates to hoisting around 32 kg safely with a two-to-one margin. The CM round end back cover provides a clean, axial rear profile for straightforward mounting.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400CM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400CM |
|---|---|
| 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 MI40X400CM
| 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 MI40X400CM Is Used
Pallet Diverter Gate
Shifts heavy timber pallets on a packaging line using its 628.3 N push force and 400 mm reach to open heavy diverter gates reliably.
Product Lowering Arm
Lowers assembled automotive modules from an overhead conveyor, safely managing a 32 kg vertical drop with its robust stainless build.
Washdown Reject Pusher
Ejects sealed beverage containers off a stainless grading table in damp food processing zones without succumbing to mild corrosion.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X400CM the Right Cylinder?
Sizing this 40 mm bore against its neighbours highlights its place at the top of the MI range. If 628.3 N at 0.5 MPa is excessive, the Ø32 bore provides 402.2 N; there is no larger standard MI bore available. The 400 mm stroke is well within the 500 mm maximum, but at this extension the Ø16 mm rod requires careful alignment to prevent side-loading and premature seal wear.
Because this SKU lacks the -S magnet, it cannot host CMSG, DMSG or EMSG position sensors. Furthermore, the fixed TPU bumpers only decelerate the end of travel and do not act as a brake. If your process requires the load to stay put upon air loss or valve centering, you must integrate an external rod lock or a pilot-operated check valve, as the piston will drift otherwise.
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 MI40X400CM FAQ
This 40 mm bore cylinder uses a 1/4 inch air port. 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 a magnet, so CMSG, DMSG or EMSG switches will not function. You would need the -S variant for sensing. It features fixed TPU bumper pads for end-deceleration rather than an adjustable air cushion, and uses a CM round end rear 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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