Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300CM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300CM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 300mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke300 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 MI40X300CM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation where smaller bores stall. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, giving it a real edge over painted-steel units in damp or washdown-prone environments. Riveted construction keeps the body compact, while fixed TPU bumper pads absorb the impact at stroke ends to protect your mechanics. The rear CM round end provides a clean, versatile mounting orientation for straightforward integration.
For practical sizing, plan for about 377 N of real work at 0.5 MPa, which equates to lifting roughly 32 kg vertically with a 2:1 safety margin. Air routes through a 1/4 inch port, and the 300 mm stroke moves the load at 30-800 mm/s. Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300CM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300CM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MI40X300CM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MI40X300CM Is Used
Heavy Stamping Ejector
Ejects dense metal blanks from a stamping press using the full 628.3 N push force, relying on the stainless rod to endure coolant splash.
Pallet Lid Press
Pulls 527.8 N at 0.5 MPa to clamp heavy pallet lids securely during transit banding, with the 300 mm stroke clearing tall loads.
Package Diverter Arm
Swings a heavy diverter arm on a high-speed logistics line, using the CM round end to pivot smoothly and route bulky cartons.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300CM the Right Cylinder?
When sizing this 40 mm bore, compare it against the adjacent Ø32 option, which yields 402.2 N of push at 0.5 MPa, or step up to this model for the full 628.3 N output. Note that Ø40 is the largest available size in the MI family, so exceeding this force requires an entirely different cylinder series. The 300 mm stroke is well within the 500 mm maximum, but at this length you must carefully manage side loading to prevent rod bending and premature seal wear.
This base MI variant uses fixed TPU bumpers for end-of-stroke deceleration rather than an adjustable air cushion; if your application throws heavy masses at high speeds, consider the MIC series instead. Furthermore, a standard cylinder drifts when air is lost or the valve is centered, so fit an external rod lock or pilot-operated check valve if you need to hold a vertical load safely in place.
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 MI40X300CM FAQ
This 40 mm bore cylinder features a 1/4 inch air port and a 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.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for sensing. Also, note that Ø40 is a non-ISO-6432 round-body size, and the fixed TPU bumpers only decelerate the stroke end rather than acting as an adjustable cushion.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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