Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300U
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300U 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 MI40X300U
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles demanding linear motion tasks. The stainless-steel barrel and Ø16 mm piston rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel alternatives degrade. A 1/4" port supplies air, while the U-style rear cover provides a 90-degree mounting interface to simplify frame integration.
Riveted construction keeps the body compact, and fixed TPU bumper pads absorb impact energy at the stroke extremes. For practical 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 suffix, it cannot accept CMSG, DMSG, or EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300U Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300U |
|---|---|
| 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 MI40X300U
| 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 MI40X300U Is Used
Pallet Diverters
Actuates heavy-duty routing gates on packaging lines, using its 628.3 N push force to reliably shift loaded pallets onto secondary conveyors.
Vertical Material Lifts
Raises tote bins in compact logistics hubs, safely lifting approximately 32 kg loads through its 300 mm travel distance.
Beverage Washdown
Drives stainless-steel sorting flaps in damp bottling plants, where the corrosion-resistant barrel withstands frequent water exposure.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300U 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 yields 402.2 N. There is no larger standard MI bore available, so if your application exceeds the theoretical 128.1 kgf maximum at 1.0 MPa, you must step up to a different cylinder family entirely. The 300 mm stroke is well within the 500 mm maximum standard stroke, keeping the unit readily available.
Keep in mind that a plain double-acting cylinder drifts if air pressure drops or the valve is centered; the TPU bumpers only decelerate the piston near the end of travel and do not function as a locking brake. To suspend a vertical load safely, install an external rod lock or a pilot-operated check valve. Additionally, the extended 300 mm rod length means you must carefully manage side-loading to prevent premature rod bending or seal wear.
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 MI40X300U FAQ
This 40 mm bore cylinder features a 1/4" air port and an 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, because this model lacks the -S suffix, it does not have an internal magnet and cannot accept CMSG, DMSG, or EMSG switches. You would need the -S variant for position sensing. It uses fixed TPU bumper pads for end-of-stroke deceleration, not 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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Most inquiries answered within 7-8 hours.
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