Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40U
The AirTAC Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40U 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 MI8X40U
Delivering 25.1 N of push force at 0.5 MPa, the AirTAC MI8X40U is a compact double-acting round-body mini cylinder built for tight spaces. Its stainless-steel barrel and Ø4 mm rod shrug off mild corrosion, giving it a real edge over painted alternatives in damp or washdown-prone environments. The 40 mm stroke operates on an M5x0.8 port, and the rear U cover provides a 90-degree mounting orientation for corner installations.
Because the bore is Ø8, the body uses standard ISO 6432 mini-cylinder mounting dimensions, dropping easily into standard brackets. Plan for about 15 N of actual work at 0.5 MPa, which means it can vertically lift roughly 1.3 kg with a safe 2:1 margin. Fixed TPU bumper pads absorb the stroke-end impact, and since this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG position switches.
Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40U Technical Specifications
| Model | Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40U |
|---|---|
| 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 MI8X40U
| 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 MI8X40U Is Used
Micro-Clamp Actuation
Drives small pneumatic clamps in PCB assembly fixtures, using its 25.1 N push force to hold delicate electronic components securely during soldering.
Lab Dispenser Routing
Shifts a lightweight reagent nozzle on automated lab benches, where the stainless construction prevents mild corrosion from chemical splashes.
Small Part Ejection
Pushes tiny molded plastic parts out of a machining center using its 40 mm stroke, safely lifting items under 1.3 kg vertically.
Is the Airtac MI8~12 Stainless Steel Mini Cylinder MI8X40U the Right Cylinder?
When sizing this 8 mm bore, note that 25.1 N push at 0.5 MPa is the maximum available in the base MI range, as there is no smaller standard bore. If your task requires more force, stepping up to the Ø10 bore provides 39.3 N. This U-cover version suits 90-degree pivot setups, but remember that a plain double-acting cylinder drifts when air is lost or the valve is centered; the TPU bumpers only decelerate the stroke end and will not lock the load. Use a pilot-operated check valve if you need to hold a vertical position. For position feedback, select the -S magnet variant instead.
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 MI8X40U 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.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG or EMSG switches. You must select the -S variant to enable magnetic sensing. It uses ISO 6432 mounting dimensions and fixed TPU bumper pads.
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