Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350R is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 350mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke350 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 MI40X350R
Delivering 628.3 N of push force at 0.5 MPa, the AirTAC MI40X350R is a robust double-acting round-body mini cylinder built for demanding automation. It features a 40 mm bore, a 350 mm stroke, and a 1/4" air port. The stainless-steel barrel and piston rod provide reliable mild-corrosion and washdown resistance, outperforming painted alternatives in damp environments. An axial-in R back cover keeps the rear pneumatic connection neatly in line with the body.
Fixed TPU bumper pads absorb the impact at stroke extremes, though they decelerate rather than act as an adjustable air cushion. Because this SKU lacks the -S suffix, it cannot accept CMSG, DMSG, or EMSG magnetic sensors. For practical sizing, plan for a safe working load of about 377 N, which lets you lift a 32 kg part vertically with a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350R |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 MI40X350R
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 MI40X350R Is Used
Heavy Package Diversion
Uses the 628.3 N push force to deflect heavy cartons on a logistics sorting line, where the stainless body survives occasional washdowns.
Pneumatic Pressing Station
Provides steady downward clamping pressure for assembling bearings, relying on the 350 mm stroke to accommodate varying fixture heights.
Pallet Component Indexing
Pushes loaded pallets into position on a roller conveyor, safely moving masses near the 32 kg vertical lift threshold without overloading the rod.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X350R the Right Cylinder?
When sizing this 40 mm bore unit, the neighbouring Ø32 generates 402.2 N of push at 0.5 MPa, while the Ø40 is the largest available in this series at 628.3 N. If your application requires position feedback, you must select an -S magnet variant to enable switch mounting. The 350 mm stroke is well within the 500 mm maximum standard stroke, meaning no made-to-order wait, but always ensure your mounting brackets—whether LB foot, FA flange, or TC trunnion—support the rod against side loads to prevent bending over this long travel distance.
Remember that venting or centering the directional valve will cause the piston to drift, as the standard construction does not lock the load. To suspend a heavy vertical mass safely during an air loss event, integrate an external rod lock or a pilot-operated check valve into your circuit rather than relying on the bumper pads.
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 MI40X350R FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 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 specific code lacks the -S suffix, there is no internal magnet and it cannot accept CMSG, DMSG, or EMSG switches. You would need the -S variant for sensing. It is also a non-ISO-6432 round-body mini cylinder that uses 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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