Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SU
The AirTAC Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SU 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 MI40X550SU
Delivering serious muscle for a compact form, this double-acting round-body mini cylinder generates 628.3 N of push force at 0.5 MPa. The stainless-steel barrel and Ø16 mm rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp washdown environments. It features a 1/4" port and a U-type 90-degree rear cover for flexible mounting orientation.
Because the 550 mm stroke exceeds the 500 mm standard maximum for this bore, this unit is a made-to-order configuration. The built-in piston magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing, while fixed TPU bumper pads absorb the impact at stroke extremes. For practical sizing, plan for roughly 377 N of actual work at 0.5 MPa, which equates to lifting about 32 kg vertically with a safe 2:1 margin.
Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SU Technical Specifications
| Model | Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SU |
|---|---|
| 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 MI40X550SU
| 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 MI40X550SU Is Used
Diverting Heavy Cartons
Pushes heavy packaged goods across a main conveyor belt line using its 628.3 N push capacity at 0.5 MPa.
Pallet Component Staging
Extends 550 mm to index large metal brackets out of a storage rack, with the U cover allowing a 90-degree pivot mount.
Washdown Gate Actuation
Opens stainless-steel access doors on a food processing line where the riveted round-body build resists mild moisture corrosion.
Is the Airtac MI25~40 Stainless Steel Mini Cylinder MI40X550SU the Right Cylinder?
When sizing this 40 mm bore against its neighbours, stepping down to a 32 mm bore drops the 0.5 MPa push force to 402.2 N, while no larger MI series option exists above it. The extended 550 mm travel demands careful attention to side loading; always guide the load to prevent rod bending over that distance. Remember that venting the air supply causes the piston to drift, as the TPU bumpers only decelerate the end of stroke and act neither as a lock nor a brake. To suspend a load safely mid-cycle, fit an external rod lock or a pilot-operated check valve.
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 MI40X550SU FAQ
This 40 mm bore cylinder uses a 1/4" port and an M12x1.25 male rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
The -S suffix means a magnet is built in, allowing CMSG, DMSG and EMSG switches to detect position. It uses fixed TPU bumper pads to decelerate the stroke end; it does not have an adjustable air cushion. Also note the 550 mm stroke is a non-standard, made-to-order length.
Authorized Export Seller
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.
Fast Reply
Most inquiries answered within 7-8 hours.
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