Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 15mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke15 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 MI40X15U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation in tight spaces. The stainless-steel barrel and rod shrug off mild corrosion, making it superior to painted alternatives in washdown zones. Its 15 mm stroke and 90-degree U back cover allow precise, compact mounting on automated lines.
With a 1/4" port and a Ø16 mm rod, the riveted construction keeps the unit light while fixed TPU bumper pads absorb end-of-stroke impacts. Plan for a safe working load of about 377 N (60% of the 0.5 MPa rating), which translates to lifting roughly 32 kg vertically with a 2:1 safety margin. Note that this SKU lacks a magnet, so it cannot host CMSG, DMSG, or EMSG sensors without upgrading to the -S variant.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 15 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 MI40X15U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 MI40X15U Is Used
Short-Stroke Stamping
Ideal for driving a compact stamping head in metal forming lines, using its 628.3 N push force to mark or crimp components in a confined 15 mm travel distance.
Heavy Diverter Gate
Actuates a robust routing flap on a high-capacity packaging conveyor, where the stainless build resists washdown and the 90-degree U cover simplifies side mounting.
Pallet Stopper Block
Functions as a heavy-duty stopper pin for pallets on a roller track, raising a solid barrier to halt loads weighing up to 32 kg safely without drifting.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15U the Right Cylinder?
When sizing this 40 mm bore, dropping down to the Ø32 model reduces the 0.5 MPa push force to 402.2 N, while the Ø40 is the largest available in this series, offering a theoretical maximum of 128.1 kgf at 1.0 MPa. Because this plain MI cylinder vents on air loss or valve centring, the piston drifts; the TPU bumpers only decelerate the stroke end rather than locking the load. For vertical or suspended loads, install an external rod lock or a pilot-operated check valve.
The 90-degree U back cover suits side-pivot layouts, and you can pair the body with LB foot, FA flange, SDB pivot, or TC trunnion brackets. The short 15 mm stroke minimizes rod-bending side loads, but if you later specify a longer stroke, ensure the load is guided to prevent rod deflection.
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 MI40X15U FAQ
This 40 mm bore cylinder features a 1/4" port and a M12x1.25 male rod 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 a magnet, so it cannot host CMSG, DMSG, or EMSG switches. You must select the -S variant (MI40X15SU) to enable magnetic sensing. The cylinder relies on fixed TPU bumper pads to decelerate the stroke end, not an adjustable air cushion.
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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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