Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SCM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SCM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 250mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke250 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 MI40X250SCM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty automation tasks. The MI40X250SCM features a robust stainless-steel barrel and Ø16 mm rod that shrug off mild corrosion and washdown environments better than painted alternatives. Its riveted construction remains compact, while fixed TPU bumper pads absorb stroke-end impacts. Because this is a Ø40 bore, it falls outside the ISO 6432 standard dimensions but provides substantial thrust for a mini form factor.
Equipped with a built-in piston magnet (-S), the cylinder supports CMSG, DMSG and EMSG reed or electronic switches for position sensing. The CM round end back cover neatly caps the rear, and the 1/4 inch port handles the air volume needed for powerful actuation. For practical sizing, plan for a safe working load of roughly 377 N, which equates to lifting about 32 kg vertically with a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SCM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SCM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MI40X250SCM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MI40X250SCM Is Used
Stamping Press Feeders
Pushes heavy metal blanks into a stamping press using 628.3 N of thrust, relying on the stainless body to resist cutting fluid splashes.
Package Diverters
Actuates a heavy routing gate along a 250 mm stroke to redirect dense cartons on a high-speed packaging conveyor line.
Pallet Lift Gates
Raises and lowers a 32 kg palletising access gate, using the built-in magnet to confirm the fully open position for forklift entry.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250SCM the Right Cylinder?
When sizing this 40 mm bore, stepping down to a Ø32 model drops the 0.5 MPa push force to 402.2 N, while no larger MI series exists above Ø40. This makes the MI40X250SCM the top choice when you need maximum thrust from a compact riveted body. The 250 mm stroke is well within the 500 mm standard limit, though at full extension you should account for potential rod bending and side-load forces to prevent premature seal wear.
The integrated magnet pairs directly with CMSG, DMSG or EMSG sensors for precise end-of-stroke detection. Remember that fixed TPU bumpers only decelerate the piston near the end of travel; they do not act as a brake. If your application must hold a vertical load when air pressure drops or the valve centres, add an external rod lock or pilot-operated check valve, as the piston will drift otherwise.
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 MI40X250SCM FAQ
This double-acting cylinder 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. It uses a 1/4 inch air port to supply the Ø40 mm bore.
No, the piston will drift if air is lost or the valve is centred. The fixed TPU bumper pads only decelerate the stroke end and do not function as a locking brake. To maintain a vertical position, you must install an external rod lock or a pilot-operated check valve.
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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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