Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SR
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SR 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 MI40X500SR
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty linear motion across a 500 mm stroke. The stainless-steel barrel and Ø16 rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel or aluminium bodies degrade. A built-in piston magnet comes standard, enabling direct mounting of CMSG, DMSG, or EMSG switches for end-position detection. The R back cover features an axial-in port, simplifying rear plumbing in tight machinery layouts.
For practical sizing, plan for a safe working load of roughly 377 N, which represents about 60% of the 0.5 MPa push rating. In a vertical lift scenario, this translates to hoisting approximately 32 kg safely with a 2:1 margin. Fixed TPU bumper pads absorb the impact at both stroke ends to protect the mechanics, while the 1/4" air port supplies the volume needed for the larger 40 mm bore.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SR Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SR |
|---|---|
| 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 MI40X500SR
| 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 MI40X500SR Is Used
Heavy Package Diversion
Pushes heavy cartons or totes across high-speed sorting conveyors using the full 628.3 N thrust at 0.5 MPa, with the stainless build surviving humid packing environments.
Pneumatic Press Platen
Drives a small pressing assembly downward over the 500 mm travel, relying on the fixed TPU bumper pads to decelerate the platen at the bottom of the stroke.
Pallet Component Indexing
Shifts heavy palletized fixtures or sub-components into a machining cell, using the integrated -S magnet and DMSG sensors to confirm the fully extended position.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X500SR the Right Cylinder?
As the largest bore in the MI series, the Ø40 sits at the top of the range with no larger standard size available. If your application requires less force, stepping down to the Ø32 bore drops the 0.5 MPa push output to 402.2 N while saving valuable space. Because this SKU features the -S magnet, it is immediately ready for CMSG, DMSG, or EMSG electronic and reed sensors without any modifications.
Keep in mind that a plain double-acting cylinder drifts if air pressure is lost or the control valve is centred, as the TPU bumpers only soften the stroke-end impact rather than locking the rod. To suspend a load safely during an emergency stop, integrate an external pilot-operated check valve or a dedicated rod lock. Additionally, spanning a 500 mm stroke on a Ø40 piston creates a long lever arm; ensure rigid front mounting and minimize side-loading to prevent premature rod bending or seal wear.
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 MI40X500SR FAQ
This 40 mm bore cylinder features a 1/4" air port and a Ø16 rod with an M12x1.25 male thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
No, the fixed TPU bumper pads only decelerate the piston near the stroke ends and do not act as a brake. If air is lost, the rod will drift; for vertical loads, you must use an external rod lock or a pilot-operated check valve to hold position safely.
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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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