Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15R 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 MI40X15R
Delivering 628.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles heavy-duty actuation in tight spaces. The 15 mm stroke is exceptionally short, and the rear R cover features an axial-in port to keep hose routing neatly inline with the body. Its stainless barrel and Ø16 mm rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown settings. Fixed TPU bumper pads absorb the impact at stroke end.
With a theoretical maximum output of 128.1 kgf at 1.0 MPa, you can plan for a safe working load of roughly 377 N during continuous operation. This equates to lifting about 32 kg vertically with a 2:1 safety margin, letting you match the actuator to real part weights immediately. Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15R |
|---|---|
| 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 MI40X15R
| 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 MI40X15R Is Used
Short-Stroke Staking
Drives a 15 mm impact stroke to stake rivets or form metal brackets, using the full 879.6 N push force at 0.7 MPa to seat components firmly.
Inline Valve Clamping
Secures heavy hydraulic manifolds during machining, with the rear axial-in R cover keeping pneumatic hoses parallel to the fixture to save space.
Washdown Pin Ejection
Ejects stainless steel locator pins from damp molding tools, relying on the corrosion-resistant barrel and 527.8 N pull force at 0.5 MPa for reliable retraction.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X15R the Right Cylinder?
As the largest bore in the MI family, there is no larger standard size to step up to if 628.3 N at 0.5 MPa proves insufficient. If you need less force, stepping down to the Ø32 bore yields 402.2 N of push, which is often enough for lighter assemblies. The 1/4" port matches the high air volume required for the 40 mm piston. Because this is a plain double-acting cylinder, air loss or a centred valve will cause the rod to drift; the TPU pads only decelerate the end of travel and do not act as a brake. For suspended loads, specify 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 MI40X15R FAQ
The 40 mm bore operates on a 1/4" port. 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.
No, this specific SKU does not have a magnet. You must select an -S variant to use CMSG, DMSG or EMSG switches. Additionally, the Ø40 size is a non-ISO-6432 round-body mini cylinder, so mounting requires standard foot or flange brackets rather than ISO mini-clevises.
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