The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X150CM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 150mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
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. Because this SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches. Fixed TPU bumper pads absorb end-of-stroke impact, and the CM round rear cover keeps the 1/4" port orientation clean for tight machinery layouts.
Plan for roughly 377 N of actual work at 0.5 MPa to maintain a safe margin. That translates to lifting about 32 kg vertically with a 2:1 safety factor, letting you match the cylinder to real part weights without guessing. With a 150 mm stroke and a hefty 128.1 kgf theoretical maximum at 1.0 MPa, it bridges the gap between standard minis and full-size actuators.
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X150CM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 150 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.
| 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.
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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.
Uses the 628.3 N push force at 0.5 MPa to knock heavy stamped metal parts out of a die, where the stainless build resists cutting fluid splash.
Swings a heavy diverter gate on a packaging line using the 150 mm stroke, relying on the CM round rear cover for a tidy inline pivot mount.
Raises 32 kg fixtures between conveyor tiers, operating safely within the calculated 2:1 vertical lift margin derived from the 0.5 MPa rating.
Since the MI40X150CM sits at the top of the MI range, there is no larger standard bore to step up to if you need more power; if 628.3 N at 0.5 MPa is excessive, step down to the Ø32 bore which provides 402.2 N. The CM round end cover offers a compact rear profile, and you can utilise LB foot, FA flange, SDB pivot or TC trunnion mounts to suit your frame. For high-speed cycling with heavy 150 mm strokes, consider the MIC variable cushion variant to replace the fixed TPU bumper pads.
Remember that a plain double-acting cylinder drifts when air pressure drops or the valve is centred, as the TPU pads only soften the stroke end rather than locking the rod. To suspend a load safely during an outage, install an external rod lock or a pilot-operated check valve. Additionally, because this specific configuration omits the -S magnet, you must choose an -S variant if your control system requires CMSG, DMSG or EMSG sensor feedback.
Quick checklist
At 0.5 MPa it provides 628.3 N push and 527.8 N pull. At 0.7 MPa it provides 879.6 N push and 738.9 N pull. The theoretical maximum force is 128.1 kgf at 1.0 MPa. This Ø40 mm model uses a 1/4" air port and a Ø16 mm rod with an M12x1.25 male thread.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG or EMSG switches. You must select an -S variant for sensing capabilities. It is also a non-ISO-6432 round-body mini cylinder, featuring fixed TPU bumper pads rather than an adjustable air cushion.
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