Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SCM
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SCM is a genuine double acting round-body mini air cylinder with a Ø40mm bore and 550mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke550 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 MI40X550SCM
Delivering 628.3 N of push force at 0.5 MPa, this double-acting round-body mini cylinder handles heavy-duty actuation where smaller bores stall. The AirTAC MI40X550SCM features a stainless-steel barrel and Ø16 rod that shrug off mild corrosion, giving it a real edge over painted-steel actuators in damp or washdown environments. A 550 mm stroke makes this a non-standard, made-to-order configuration that exceeds the 500 mm maximum standard length for this bore.
The riveted construction keeps the body compact, while fixed TPU bumper pads absorb the impact at stroke extremes to protect the mechanism. Because the piston pushes with roughly 628.3 N at 0.5 MPa, you can plan for a safe working load of about 377 N of real work. In vertical lifting scenarios, that same 0.5 MPa output translates to lifting about 32 kg safely with a 2:1 margin. The 1/4" port feeds air to drive the Ø40 piston, and the built-in magnet (-S) supports CMSG, DMSG and EMSG position switches.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SCM Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SCM |
|---|---|
| Series | MI mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 MI40X550SCM
| MI | round-body mini cylinder (double-acting). |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 MI40X550SCM Is Used
Heavy Stamping Ejector
Ejects dense metal stampings from a hydraulic press bed using 628.3 N of push force at 0.5 MPa, with the 550 mm stroke clearing tall tooling.
Vertical Pallet Descender
Lowers packaging pallets in a high-humidity washdown zone, leveraging the stainless steel construction to prevent corrosion while managing the 32 kg safe vertical lift capacity.
Long-Reach Diverter Gate
Pivots a heavy routing gate across a wide conveyor belt, requiring the extended 550 mm travel and the robust Ø16 piston rod to maintain rigidity during high-speed sorting.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SCM the Right Cylinder?
Choosing this Ø40 actuator means you need substantial thrust; stepping down to a Ø32 bore drops the 0.5 MPa push force to 402.2 N, while Ø40 is the largest available size in this series. The 550 mm travel distance is a non-standard, made-to-order length, so expect a longer lead time and verify side-load risks—ensure your guiding structure prevents rod bending over this extended reach. The CM round end back cover dictates the rear mounting orientation, and you can utilize LB foot, FA flange, SDB pivot, or TC trunnion brackets to suit your frame.
Position confirmation relies on the internal magnet pairing with CMSG, DMSG or EMSG sensors. Remember that a standard actuator cannot hold a load if air pressure drops or the valve is centred, as the piston will drift; the bumpers only decelerate the end of travel and act as neither a lock nor a brake. To suspend a load securely during an air loss event, integrate an external rod lock or a pilot-operated check valve into your circuit.
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 MI40X550SCM FAQ
This double-acting cylinder uses a 1/4" air port and generates a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa. At 0.7 MPa, the push increases to 879.6 N and the pull to 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
No, the piston will drift if air pressure drops or the directional valve is centred. The fixed TPU bumper pads only decelerate the rod near the stroke end and do not function as a locking brake. To maintain a vertical load during air loss, you must install an external rod lock or a pilot-operated check valve.
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Genuine AirTAC parts produced by AirTAC factory.
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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Most inquiries answered within 7-8 hours.
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