Airtac MI8~12 Stainless Steel Mini Cylinder MI8X125SU
The AirTAC Airtac MI8~12 Stainless Steel Mini Cylinder MI8X125SU is a genuine double acting round-body mini air cylinder with a Ø8mm bore and 125mm 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
- Stroke125 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 MI8X125SU
Delivering 25.1 N of push force at 0.5 MPa, the AirTAC MI8X125SU 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-steel alternatives in damp or washdown-prone environments. The riveted construction keeps the unit light, while fixed TPU bumper pads absorb impact at the stroke ends without offering adjustable cushioning.
Because this SKU includes the -S suffix, a built-in piston magnet is present, allowing you to mount CMSG, DMSG or EMSG reed or electronic switches for position sensing. The U-type back cover provides a 90-degree port orientation for neat routing, and the M5x0.8 port matches the Ø8 bore. For practical sizing, plan for a safe working load of about 15 N (roughly 60% of the 0.5 MPa rating), which translates to lifting a 1.3 kg part vertically with a 2:1 safety margin.
Airtac MI8~12 Stainless Steel Mini Cylinder MI8X125SU Technical Specifications
| Model | Airtac MI8~12 Stainless Steel Mini Cylinder MI8X125SU |
|---|---|
| Series | MI ISO 6432 mini cylinder |
| Bore size | Ø8 mm |
| Stroke | 125 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 MI8X125SU
| MI | ISO 6432 round-body mini cylinder (double-acting). |
|---|---|
| 8 | Bore size in mm. |
| ×125 | 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 MI8X125SU Is Used
Micro-Dispenser Actuation
Drives a tiny dosing valve in a benchtop adhesive potting machine, using the 25.1 N push force to dispense precise epoxy drops without stressing the manifold.
Lab Sample Diverting
Pushes a small diverter flap in an analytical instrument, where the stainless build resists humidity and the -S magnet triggers a DMSG sensor to confirm routing.
Light-Part Ejection
Ejects lightweight plastic caps from a moulding nest, safely lifting parts under 1.3 kg vertically with a 2:1 margin before they are blown into a collection bin.
Is the Airtac MI8~12 Stainless Steel Mini Cylinder MI8X125SU the Right Cylinder?
When sizing this 8 mm bore, note that it is the smallest available in the MI family, so if your application requires less than the 15 N safe working load, you will need to step outside the MI series entirely. If you need more force, stepping up to the Ø10 bore increases push force to 39.3 N at 0.5 MPa. This 125 mm stroke sits comfortably within the 150 mm maximum standard stroke for the Ø8 bore, though at this length you should ensure the rod is guided to prevent side-loading and premature seal wear.
Remember that a standard double-acting cylinder like this relies on continuous air pressure to maintain its position; if air is lost or the valve is centred, the piston will drift. The fixed TPU bumpers only decelerate the stroke end and do not act as a brake, so for holding a vertical load you must add an external rod lock or a pilot-operated check valve. The ISO 6432 mounting interface lets you drop this cylinder into standard mini-cylinder brackets and clevises.
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 MI8X125SU FAQ
This Ø8 mm bore cylinder features an M5x0.8 port and a Ø4 mm rod with an M4x0.7 male thread. It generates 25.1 N push and 18.8 N pull at 0.5 MPa, 35.2 N push and 26.4 N pull at 0.7 MPa, with a theoretical maximum of 5.1 kgf at 1.0 MPa.
Yes, the -S suffix means a magnet is built-in, allowing CMSG, DMSG or EMSG switches to be fitted. However, the cylinder does not hold position if air is lost; the piston drifts, and the fixed TPU bumpers only decelerate the stroke end rather than locking the load.
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