Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30R is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 30mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke30 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 MI40X30R
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation in tight spaces. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, making it highly reliable in damp or washdown environments where painted steel fails. It features an R back cover with an axial-in port, simplifying rear plumbing in cramped machinery layouts. Fixed TPU bumper pads absorb the end-of-stroke impact, protecting the 30 mm travel from mechanical shock.
Because the bore is Ø40, this unit exceeds standard mini-cylinder conventions and operates purely as a robust round-body actuator without an ISO 6432 mounting interface. Plan for a safe working load of roughly 377 N, which lets you lift about 32 kg vertically with a 2:1 safety margin. This SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG position switches; choose the -S variant if your control system requires electronic sensing.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30R |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 MI40X30R
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 MI40X30R Is Used
Short-Stroke Clamping
Ideal for securing heavy steel billets in CNC machining centers, using the 628.3 N thrust to lock parts firmly against a stop during milling operations.
Diversion Gate Actuator
Drives heavy-duty routing flaps on high-speed packaging lines, where the 30 mm stroke rapidly redirects bulky cartons without occupying excessive frame depth.
Pallet Stop Block
Functions as a robust end-stop in palletizing cells, using its stainless build to withstand constant impacts and washdown cleaning in logistics hubs.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X30R the Right Cylinder?
When sizing this 40 mm bore, compare its 628.3 N push force at 0.5 MPa against the smaller Ø32 bore, which provides 402.2 N. There is no larger MI round-body option available, making this the top choice for maximum thrust within the series. The 1/4" air port and M12×1.25 male rod thread are fixed by the bore size to handle the higher air volume and structural load. Because the stroke is a short 30 mm, side-load and rod-bending risks are minimal, but ensure the rear R axial port orientation aligns with your manifold layout.
This standard MI version does not hold its position if air pressure drops or the valve is centered; the piston will drift. The fixed TPU bumpers only decelerate the stroke end and do not act as a brake. To suspend a load safely mid-cycle, install an external pilot-operated check valve or a dedicated rod lock.
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 MI40X30R FAQ
At 0.5 MPa, the push force is 628.3 N and the pull force is 527.8 N. At 0.7 MPa, push is 879.6 N and pull is 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa. This 40 mm bore cylinder uses a 1/4" air port and a Ø16 mm rod with an M12×1.25 male thread.
No, this specific SKU does not include a magnet. To use CMSG, DMSG, or EMSG electronic switches, you must select the -S variant of this model. Additionally, the Ø40 bore does not conform to ISO 6432 mounting dimensions; it is strictly a round-body mini cylinder, and it relies on fixed TPU bumper pads rather than an adjustable air cushion.
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1-Year Warranty
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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