Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke50 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 MI40X50SU
Delivering a robust 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation where smaller bores stall. The stainless-steel barrel and Ø16 rod shrug off mild corrosion, giving it a real edge over painted steel in damp washdown environments. A 1/4" port feeds the chamber efficiently, while the riveted construction keeps the body compact.
Because the 50 mm stroke is short, the fixed TPU bumper pads easily absorb the end-of-travel impact without needing adjustment. Plan for a safe working load of roughly 377 N, which translates to lifting about 32 kg vertically with a 2:1 safety margin. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for precise position detection.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MI40X50SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MI40X50SU Is Used
Stamping Press Feed
Pushes heavy billets into a forming press using its 879.6 N push force at 0.7 MPa to overcome initial material resistance.
Pallet Diverter
Shifts loaded pallets sideways on a packaging line, safely handling the 32 kg vertical lift equivalent without buckling.
Gate Actuation
Drives a heavy stainless-steel washdown gate in a food plant, relying on the corrosion-resistant barrel and U-style rear pivot.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50SU the Right Cylinder?
When sizing this actuator, dropping down to a Ø32 bore drops the 0.5 MPa push force to 402.2 N, while no larger MI bore exists for heavier demands. The 90-degree U back cover simplifies port and pivot orientation in tight machinery. Remember that a standard cylinder drifts if air pressure drops or the valve is centred, so fit an external rod lock or pilot check valve if you need to suspend a load safely. For high-speed cycles generating significant kinetic energy, consider the MIC variant which offers adjustable air cushioning instead of these fixed bumpers.
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 MI40X50SU FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it yields 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa, and the air port is 1/4".
No, the Ø40 bore is a non-ISO-6432 round-body mini cylinder. It uses fixed TPU bumper pads to decelerate the stroke end rather than an adjustable air cushion. The -S suffix means it has a magnet for CMSG, DMSG or EMSG sensors.
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Genuine AirTAC parts produced by AirTAC factory.
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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