Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 500mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke500 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 MI40X500SU
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation tasks with ease. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, making it highly reliable in damp or washdown environments where painted alternatives degrade. Because this is a Ø40 bore, it steps outside the ISO 6432 standard dimensions, operating purely as a robust round-body unit.
Equipped with a 90-degree U back cover and a 1/4" port, it integrates smoothly into existing pneumatic setups. For practical sizing, plan for a safe working load of about 377 N, which equates to lifting roughly 32 kg vertically with a 2:1 safety margin. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for precise end-of-stroke detection.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 MI40X500SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 MI40X500SU Is Used
Heavy Material Ejection
Provides the 628.3 N push force required to eject dense molded parts from large injection molding machines at the end of each cycle.
Pallet Diverting
Uses the 500 mm stroke and 32 kg vertical lift capacity to divert heavy loaded pallets across a high-throughput packaging conveyor line.
Press Feed Clamping
Secures thick metal stock during automated press feeding, relying on the stainless construction to withstand coolant spray and industrial debris.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SU 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 is insufficient, you will need a different cylinder series entirely. Stepping down, the Ø32 bore provides 402.2 N of push force, making this MI40X500SU the right choice only when that extra 226 N of thrust is strictly necessary. With a long 500 mm stroke, carefully manage side loads to prevent rod bending and premature seal wear.
The fixed TPU bumper pads decelerate the piston at the stroke ends but do not act as an adjustable air cushion. Furthermore, this cylinder will drift if air pressure is lost or the valve is centered; the bumpers will not hold the load. To lock a suspended weight in place, 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 MI40X500SU FAQ
This double-acting cylinder delivers 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. It features a 1/4" air port and a Ø16 mm piston rod with an M12x1.25 male thread.
Yes, the -S suffix indicates a built-in piston magnet designed for CMSG, DMSG and EMSG reed or electronic switches. The U back cover provides a 90-degree mounting interface, while the fixed TPU bumper pads absorb stroke-end impact without offering adjustable cushioning.
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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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