Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40R
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40R is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 40mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke40 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 MI40X40R
Delivering 628.3 N of push force at 0.5 MPa, the AirTAC MI40X40R is a robust double-acting round-body mini cylinder built for demanding automation. Its stainless-steel barrel and piston rod shrug off mild corrosion, making it highly suitable for damp washdown environments where painted steel quickly degrades. The riveted construction keeps the unit compact, while fixed TPU bumper pads absorb impact energy at the stroke ends to protect your tooling.
Equipped with a 1/4 inch port and an R-type back cover featuring an axial-in port orientation, this 40 mm bore model moves air efficiently for rapid cycling. Because this SKU lacks a magnet, it cannot host CMSG, DMSG, or EMSG sensors; you would need the -S variant for position detection. For practical sizing, plan for a safe working load of about 377 N, which comfortably lifts a 32 kg part vertically with a 2:1 safety margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40R Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40R |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 MI40X40R
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MI40X40R Is Used
Stamping Press Feeders
Pushes heavy metal blanks into a progressive die with 628.3 N of force, utilizing the R-type axial-in port to keep hose routing tight against the machine frame.
Pallet Diverters
Actuates heavy lane guides to redirect loaded pallets on a packaging line, relying on the stainless construction to survive occasional washdowns.
Vertical Crate Lifters
Raises 32 kg component crates between conveyor tiers with a safe 2:1 margin, taking advantage of the 40 mm stroke for rapid, compact elevation changes.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X40R the Right Cylinder?
When sizing this 40 mm bore unit, compare its 628.3 N push force at 0.5 MPa against the smaller Ø32 bore, which provides 402.2 N. Since Ø40 is the largest available in this series, moving heavier loads requires multiple cylinders or a different body style entirely. The 40 mm stroke is well within the 500 mm maximum standard limit, keeping the rod short and highly resistant to bending under high side-loads.
Remember that fixed TPU bumpers only decelerate the piston near the end of travel; they do not act as a brake. If your application must hold a vertical load when air pressure drops or the valve centres, you must add an external rod lock or a pilot-operated check valve, as the piston will drift otherwise. Mounting options include LB foot, FA flange, SDB pivot, and TC trunnion brackets.
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 MI40X40R FAQ
This double-acting cylinder uses a 1/4 inch 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, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG, or EMSG switches. You would need to specify the -S variant for sensor compatibility. It features fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion.
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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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