Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU
The AirTAC Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU is a genuine double acting round-body mini air cylinder with a Ø8mm bore and 40mm stroke, M5×0.8 air ports and a stainless-steel barrel and rod for mildly corrosive environments. Its ISO 6432 mounting interface makes it a compact drop-in for standard mini-cylinder fixtures.
- BoreØ8 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typeDouble acting
- Rod threadM4×0.7
- CushionFixed TPU bumper pads
About the Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU
Delivering 25.1 N of push force at 0.5 MPa, the AirTAC MI8X40SU is a compact double-acting round-body mini cylinder built for tight spaces. Its stainless-steel barrel and rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown settings. The riveted construction keeps the unit light, while fixed TPU bumper pads absorb end-of-stroke impacts. Because this 8 mm bore uses the ISO 6432 mounting interface, it drops directly into standard mini-cylinder brackets and clevises.
Equipped with a built-in piston magnet (-S), this version supports CMSG, DMSG and EMSG reed or electronic switches for position sensing. The U-style back cover provides a 90-degree port and mounting orientation. For practical sizing, plan for about 15 N of real work at 0.5 MPa, which means it lifts roughly 1.3 kg vertically with a 2:1 safety margin. Air connects via an M5x0.8 port, and the 4 mm rod features an M4x0.7 male thread.
Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU Technical Specifications
| Model | Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø8 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | M5×0.8 |
| Rod thread | M4×0.7 |
| 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 150 mm |
Specifications follow the official AirTAC MI/MIC (ISO 6432) datasheet. Barrel & rod: stainless steel (round-body, riveted construction). Thread options: PT (blank) / G.
Theoretical Output Force (Ø8mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 25 N | 19 N |
| 0.7 MPa | 35 N | 26 N |
| Max (@1.0 MPa) | 5 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 8 | 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 MI8~12 Stainless Steel Mini Cylinder MI8X40SU Is Used
Micro-Clamp Actuation
Drives small pneumatic clamps in PCB assembly fixtures, using the 25.1 N thrust to secure delicate components without crushing them.
Lab Dispenser Push
Precisely pushes the plunger of a micro-fluidic valve in automated lab testing equipment, relying on the 15 N safe working load for consistent fluid metering.
Light Part Ejection
Ejects small plastic moulded parts from a conveyor chute, where the stainless construction withstands occasional coolant mist and the 1.3 kg lift capacity handles light rejects.
Is the Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40SU the Right Cylinder?
When sizing this 8 mm bore, note there is no smaller option in the MI family, but stepping up to the Ø10 bore increases push force to 39.3 N at 0.5 MPa if your payload exceeds the 15 N safe working load. The 40 mm stroke is well within the 150 mm maximum standard stroke, so no made-to-order sizing is required here. Mounting options include LB foot, FA flange, SDB pivot and TC trunnion, complementing the 90-degree U back cover.
Remember that a plain double-acting cylinder drifts if air pressure drops or the valve is centred; the TPU bumpers only decelerate the stroke end and do not act as a brake. To hold a vertical load securely during an air loss event, 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 MI8~12 Stainless Steel Mini Cylinder MI8X40SU FAQ
At 0.5 MPa it provides 25.1 N push and 18.8 N pull. At 0.7 MPa it provides 35.2 N push and 26.4 N pull. The theoretical maximum force is 5.1 kgf at 1.0 MPa. The air port is M5x0.8.
Yes, the -S suffix means it has a built-in magnet for CMSG, DMSG or EMSG switches. It does not hold position on air loss; the fixed TPU bumpers only decelerate the stroke end. Use a pilot check valve for load holding.
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