Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350SU is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 350mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke350 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 MI40X350SU
Delivering serious muscle in a compact riveted format, this double-acting round-body mini cylinder pushes with 628.3 N of force at 0.5 MPa. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, making the unit far more suitable for damp washdown environments than painted alternatives. A 1/4" port supplies the air, while fixed TPU bumper pads absorb the impact at stroke extremes without offering adjustable cushioning.
Because the 350 mm stroke moves a heavy load over a long distance, planning for about 377 N of real work at 0.5 MPa leaves a safe margin. That translates to lifting roughly 32 kg vertically against gravity. The built-in piston magnet (-S) supports CMSG, DMSG and EMSG switches for end-of-stroke confirmation.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350SU |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 MI40X350SU
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 MI40X350SU Is Used
Pallet Diverters
Shifts heavy pallets laterally across packaging lines using the full 628.3 N thrust at 0.5 MPa.
Vertical Crate Lifting
Raises loaded timber crates weighing up to 32 kg between floor levels with a safe 2:1 lift margin.
Stamping Ejectors
Pushes aluminium blanks out of progressive dies where the stainless rod survives coolant spray.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350SU the Right Cylinder?
When sizing this 40 mm bore, dropping down to the Ø32 class reduces the push force to 402.2 N at 0.5 MPa, whereas there is no larger standard MI frame above it. If your cycle demands heavy deceleration from high speeds, consider the MIC variant which adds true adjustable air cushioning instead of the standard fixed TPU pads. The U-type back cover provides a 90-degree port orientation to help route hoses cleanly in tight machinery.
Remember that a standard double-acting piston will drift if air pressure drops or the directional valve is centred. The bumpers only soften the end-of-travel impact and act purely as deceleration pads, never as a locking device. To suspend a load safely mid-stroke, fit an external pilot-operated check valve or a dedicated rod lock.
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 MI40X350SU FAQ
This 40 mm bore cylinder features a 1/4" air port and an M12x1.25 male rod thread. It generates 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.
Yes, the -S suffix indicates a built-in piston magnet compatible with CMSG, DMSG and EMSG reed or electronic switches. The U-type back cover provides a 90-degree mounting and port orientation. Note that Ø40 is a non-ISO-6432 round-body size.
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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.
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Most inquiries answered within 7-8 hours.
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