Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250CM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250CM 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 MI40X250CM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty tasks within a compact footprint. The stainless-steel barrel and Ø16 mm piston rod resist mild corrosion and washdown, outperforming painted alternatives in damp environments. It features a 1/4" port and a CM round rear cover for straightforward orientation.
Fixed TPU bumper pads absorb impact at the stroke extremes, though they do not provide adjustable cushioning. For real-world 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. Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250CM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250CM |
|---|---|
| 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 MI40X250CM
| 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 MI40X250CM Is Used
Package Diverting
Pushes heavy cartons off a main packaging line using the 628.3 N thrust, with the 250 mm stroke clearing wide conveyor belts.
Pallet Handling
Actuates a mechanical stop or alignment gate on a roller conveyor, where the stainless build survives dusty and mildly humid warehouse conditions.
Press Ejection
Ejects formed metal or plastic parts from a press bed, relying on the fixed TPU bumpers to decelerate the rod at the end of the 250 mm travel.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X250CM the Right Cylinder?
When sizing this 40 mm bore, compare it against its neighbours: a Ø32 bore yields 402.2 N of push at 0.5 MPa, while the Ø40 provides 628.3 N, making it the top-tier option in the MI series with no larger standard bore available. For high-speed cycling with heavy 250 mm strokes, consider the MIC variant which adds variable air cushioning to manage kinetic energy better than these fixed bumpers.
Remember that a standard double-acting cylinder drifts if air pressure drops or the valve is centred, as the TPU pads only soften the end-of-stroke impact rather than locking the rod. To suspend a load safely, integrate an external rod lock or a pilot-operated check valve. You can mount this unit using LB foot brackets, FA flanges, SDB pivot blocks or TC trunnions.
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 MI40X250CM FAQ
This 40 mm bore cylinder uses a 1/4" port. 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.
No, the Ø40 bore exceeds the ISO 6432 standard dimensions, so it is strictly a round-body mini cylinder that requires standard 40 mm mounts like LB, FA or TC. Additionally, this SKU lacks a magnet, so it cannot take CMSG, DMSG or EMSG sensors; you would need the -S variant for position detection.
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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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