Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50R is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke50 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 MI40X50R
Delivering a substantial 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 piston rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel quickly degrades. It features a 1/4" air port and an R axial-in rear cover for straightforward plumbing in confined machinery.
Because the stroke-end impact is managed by fixed TPU bumper pads rather than an adjustable cushion, the unit remains compact and low-maintenance. Plan for roughly 377 N of real work at 0.5 MPa to maintain a safe margin, which translates to lifting about 32 kg vertically. Note that this specific SKU lacks a magnet, so it cannot host CMSG, DMSG or EMSG sensors without switching to the -S variant.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50R |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MI40X50R
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MI40X50R Is Used
Heavy-Duty Stamping
Drives a 30 kg stamping die in an automotive parts press, utilising its 628.3 N push force at 0.5 MPa to form sheet metal reliably.
Pallet Diverter
Pushes loaded pallets onto a secondary packaging line, where the stainless-steel build resists moisture from ambient washdowns.
Gate Actuation
Operates a heavy sorting gate in a logistics hub, with the R axial-in port simplifying hose routing in the tight conveyor frame.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X50R the Right Cylinder?
When sizing this 40 mm bore actuator, dropping down to the Ø32 model reduces the 0.5 MPa push force to 402.2 N, while no larger MI bore exists if you need more power. The short 50 mm stroke keeps rod bending stress minimal even under high side-loads. If your application must hold a vertical load during air loss or valve centering, remember this base cylinder will drift; the TPU pads only decelerate the stroke end and act as neither a lock nor a brake. You must fit an external rod lock or pilot-operated check valve for secure positioning. Furthermore, this non-magnetic version cannot accept position switches, and its R-type back cover dictates a specific axial port orientation.
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 MI40X50R FAQ
This 40 mm bore cylinder uses a 1/4" air port. 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, this specific SKU does not include a magnet and therefore cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for position sensing. The unit features fixed TPU bumper pads for stroke-end deceleration rather than an adjustable air cushion.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
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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