Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SUTC
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SUTC 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 MI40X300SUTC
Delivering 628.3 N of push force at 0.5 MPa, the AirTAC MI40X300SUTC is a robust double-acting round-body mini cylinder built for demanding automation. Its stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp washdown environments. The riveted construction keeps the unit compact while fixed TPU bumper pads absorb the impact at stroke end. Because this is a Ø40 bore, it uses a 1/4" port and falls outside the ISO 6432 mounting standard, operating purely as a heavy-duty round-body solution.
For practical sizing, plan for about 377 N of actual work at 0.5 MPa, which safely lifts roughly 32 kg vertically with a 2:1 margin. The built-in piston magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing. A 90-degree U back cover and TC trunnion mount provide flexible pivot installation for your 300 mm stroke requirements.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SUTC Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SUTC |
|---|---|
| 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 MI40X300SUTC
| 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 MI40X300SUTC Is Used
Heavy Package Diversion
Uses the 628.3 N push force to deflect heavy cartons on a washdown-grade stainless conveyor line, where the riveted round body resists moisture.
Pneumatic Press Platen
Moves a 300 mm stroke to lower a small pressing platen, relying on the fixed TPU bumper pads to soften the impact at the bottom of the cycle.
Pallet Gate Pivot
Employs the TC trunnion and 90-degree U back cover to swing a heavy security gate on a pallet wrapper, safely lifting components around 32 kg.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X300SUTC 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. If you need more power, note that Ø40 is the largest available in this MI series. The 300 mm stroke is well within the 500 mm maximum standard stroke, meaning no made-to-order modifications are required.
Remember that a standard double-acting cylinder drifts when air is removed or a valve is centered, as the fixed TPU bumpers only decelerate the stroke end without locking the piston. To suspend a load safely mid-stroke, integrate an external rod lock or a pilot-operated check valve. The included TC trunnion pairs with the U back cover to handle angular misalignment on long strokes, reducing side-load stress on the rod.
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 MI40X300SUTC FAQ
This double-acting cylinder uses a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
No, the base MI features fixed TPU bumper pads that decelerate the stroke end, not an adjustable air cushion (see the MIC variant for that). However, the -S magnet allows you to mount CMSG, DMSG or EMSG switches for electronic position sensing.
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