Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25R is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 25mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke25 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 MI40X25R
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty short-stroke tasks. The stainless-steel barrel and Ø16 mm rod resist mild corrosion and washdown, outperforming painted alternatives in damp or outdoor settings. Its riveted construction keeps the unit compact while the fixed TPU bumper pads absorb end-of-stroke impact.
Equipped with a 1/4" port and an R axial-in rear cover, the unit operates at 30-800 mm/s. Plan for roughly 377 N of actual work at 0.5 MPa to ensure smooth cycling. This translates to lifting about 32 kg vertically with a 2:1 safety margin. Note this SKU lacks a magnet, so CMSG, DMSG or EMSG switches cannot be fitted.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25R |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 MI40X25R
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 MI40X25R Is Used
Short-Stroke Stamping
Drives a compact marking press to emboss thick metal tags, utilising the 628.3 N push force to create deep, legible characters within a tight 25 mm travel.
Heavy Diverter Gate
Actuates a robust routing flap on a high-capacity packaging line, where the stainless build withstands daily washdowns and the compact stroke flips heavy parcels quickly.
Pallet Stopper Block
Locks heavy pallets into position at a wrapping station, using the substantial 40 mm bore capacity to halt momentum without deflecting under the load.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X25R the Right Cylinder?
As the largest bore in the MI family, there is no larger standard size to step up to; if 628.3 N at 0.5 MPa is insufficient, you must explore external boosters or alternative series. Stepping down, the Ø32 bore provides 402.2 N of push force, offering a lighter footprint if the full 40 mm capacity is unnecessary. The 25 mm stroke keeps the rod short, minimising side-load bending risks.
The R back cover directs the air supply axially, which helps when routing hoses in tight manifolds. Because this base MI has no magnet, position sensing is impossible without upgrading to an -S variant. Remember that the TPU bumpers only decelerate the stroke end; they do not function as a brake, so fit an external rod lock or pilot check valve if you need to prevent drift on air loss.
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 MI40X25R FAQ
The 1/4" port feeds a Ø40 mm bore that 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, this specific SKU lacks the internal magnet required for sensing. To use CMSG, DMSG or EMSG switches, you must specify the -S variant. The unit also features an R axial-in rear cover and fixed TPU bumpers rather than an adjustable air cushion.
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1-Year Warranty
Covers non-human-caused product damage.
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