Airtac MI25~40 Stainless Steel Mini Cylinder MI40X200U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X200U is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 200mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke200 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 MI40X200U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting stainless-steel round-body mini cylinder handles heavy-duty actuation where smaller bores stall. The Ø40 mm barrel and Ø16 mm piston rod are rolled and riveted, shrugging off mild corrosion and washdown better than painted alternatives. It breathes through a 1/4" port and relies on fixed TPU bumper pads to decelerate the stroke end without adjustable cushioning.
For practical sizing, plan for a safe working load of about 377 N, which lets you lift roughly 32 kg vertically with a 2:1 safety margin. The U back cover provides a 90-degree port and mounting orientation for tight machine layouts. Note this SKU lacks a magnet, so it cannot host CMSG, DMSG or EMSG sensors; choose the -S variant if you need position feedback.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X200U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X200U |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 200 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 MI40X200U
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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 MI40X200U Is Used
Stamping Press Ejection
Uses the 628.3 N push force to knock heavy stamped metal panels out of a die, relying on the stainless body to endure coolant splash.
Vertical Parts Lowering
Lowers 30 kg automotive castings from an overhead conveyor, staying within the 32 kg safe vertical lift limit at 0.5 MPa.
Pallet Diverter Gate
Swings a heavy lane diverter on a packaging line, with the 90-degree U cover allowing a compact side-mounted pivot joint.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X200U the Right Cylinder?
When sizing this 200 mm stroke actuator, compare it against its neighbours: the Ø32 bore yields 402.2 N of push at 0.5 MPa, while the Ø40 hits 628.3 N, making the latter necessary for heavier jigs. Since this is the largest standard round-body mini cylinder in the family, moving beyond 628.3 N requires switching to a different profile series entirely. The 200 mm travel is well within the 500 mm maximum, though at full extension you should watch for rod-bending side loads.
The U-type rear cover simplifies 90-degree mounting, but remember that air pressure alone does not secure the load. If the valve centres or supply drops, the piston drifts; the TPU bumpers only soften the end-of-stroke impact. Fit an external rod lock or pilot-operated check valve to hold a suspended weight safely.
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 MI40X200U FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa. Air is supplied through a 1/4" port, and the male rod thread is M12x1.25.
No, this specific SKU lacks a piston magnet, so CMSG, DMSG and EMSG switches will not function. You must select the -S magnet variant for position sensing. It uses fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion.
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