Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SU 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 MI40X15SU
Generating up to 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty short-stroke tasks. The stainless-steel barrel and piston rod resist mild corrosion, making it highly suitable for damp washdown environments where painted steel bodies fail. A built-in piston magnet allows seamless integration with CMSG, DMSG, or EMSG switches for position sensing.
Equipped with a 1/4" port and a 15 mm stroke, the riveted construction keeps the unit compact while fixed TPU bumper pads absorb the impact at stroke ends. For practical sizing, plan for a safe working load of about 377 N, which safely lifts roughly 32 kg vertically with a 2:1 margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SU |
|---|---|
| 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 MI40X15SU
| 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 MI40X15SU Is Used
Short-Stroke Clamping
Ideal for securing heavy metal castings in CNC fixtures, utilizing the 628.3 N push force across a rapid 15 mm travel distance.
90-Degree Pressing
The U back cover and high thrust make it perfect for downward pressing tasks in electronic component insertion assemblies.
Washdown Diverting
Stainless steel construction survives damp packaging lines, powering heavy-duty diverter gates that require reliable position feedback via the internal magnet.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15SU the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm bore reduces the 0.5 MPa push force to 402.2 N, while this 40 mm unit provides the maximum 628.3 N in the series. The 15 mm stroke is extremely short, minimizing rod bending and side-load risks even under high lateral stress. The U back cover provides a 90-degree mounting orientation for tight spatial constraints.
Because it is a double-acting cylinder, the piston will drift if air pressure is lost or the valve is centered, as the TPU bumpers only decelerate the stroke end and do not function as a locking brake. To suspend a load safely during an air failure, install an external rod lock or a pilot-operated check valve.
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 MI40X15SU FAQ
This 40 mm bore cylinder features a 1/4" port and delivers 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.
No, the piston will drift if air is lost or the valve is centered. The fixed TPU bumper pads only decelerate the stroke end and do not act as a brake. You must add an external rod lock or pilot check valve to hold a suspended load. The -S magnet enables position sensing with CMSG, DMSG, or EMSG switches.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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