Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125CM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125CM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 125mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke125 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 MI40X125CM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation tasks. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion and washdown environments better than painted alternatives. It features a CM round rear cover and a 1/4 inch air port, operating smoothly across a 30-800 mm/s speed range.
Fixed TPU bumper pads absorb end-of-stroke impact without offering adjustable cushioning. Plan for roughly 377 N of actual work at 0.5 MPa, which translates to lifting about 32 kg vertically with a safe 2:1 margin. Because this SKU lacks a magnet, it cannot accept CMSG, DMSG, or EMSG position switches; specify the -S variant if you require electronic sensing.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125CM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125CM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MI40X125CM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MI40X125CM Is Used
Stamping Press Ejection
Uses the full 628.3 N push force at 0.5 MPa to knock heavy stamped metal parts out of a die on an automotive production line.
Packaging Press
Pushes down with 879.6 N at 0.7 MPa to securely fold and seal thick corrugated carton flaps in a high-speed logistics hub.
Pallet Diverter
Extends 125 mm to push heavy loaded pallets sideways onto a secondary conveyor belt, relying on the stainless build for dusty industrial settings.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X125CM the Right Cylinder?
As the largest bore in the series, the MI40X125CM sits at the top of the range with no larger standard MI size available. If your application requires less force, stepping down to the Ø32 bore drops the 0.5 MPa push force to 402.2 N. This 125 mm stroke is well within the 500 mm maximum standard limit, keeping the rod bending risk low. The CM round end cover dictates your rear mounting orientation, so verify it matches your fixture.
Remember that the TPU bumpers only decelerate the piston near the stroke end; they do not function as a lock. If air pressure drops or the valve is centered, the rod will drift and drop any suspended mass. To maintain vertical position safely under power loss, integrate 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 MI40X125CM FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa. The air port is 1/4 inch and the male rod thread is M12x1.25.
No, the Ø40 bore exceeds the ISO 6432 standard dimensions, so it is simply a round-body mini cylinder. Additionally, this specific SKU lacks a magnet and cannot host CMSG, DMSG, or EMSG switches; you must select the -S magnet variant 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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Most inquiries answered within 7-8 hours.
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