Airtac MID Series Double Rod Mini Cylinder MID8X40S
The AirTAC Airtac MID Series Double Rod Mini Cylinder MID8X40S is a genuine double acting, double rod 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, double rod
- Rod threadM4×0.7
- CushionFixed TPU bumper pads
About the Airtac MID Series Double Rod Mini Cylinder MID8X40S
Delivering 18.8 N of thrust at 0.5 MPa in both directions, the AirTAC MID8X40S is a compact double-acting mini cylinder. Because a Ø4 mm piston rod exits both end covers, the extend and retract forces are identical, and the through-rod design naturally resists rotation and side loads without needing an external guide. The stainless-steel round barrel and dual rods offer mild corrosion resistance for light washdown environments. It uses an M5x0.8 air port and conforms to the ISO 6432 mounting interface for easy bracket integration.
This 8 mm bore, 40 mm stroke variant includes a built-in piston magnet (-S) for position sensing with CMSG, DMSG, or EMSG switches. For practical sizing, its safe working load is roughly 11 N, meaning it can vertically lift about 1 kg with a 2:1 safety margin. The rear rod end is free to trip a switch or carry a stop, while fixed TPU bumper pads soften the stroke ends. Note that bumpers only decelerate the piston; they do not lock the load on air loss, so an external rod lock or pilot check valve is needed for holding.
Airtac MID Series Double Rod Mini Cylinder MID8X40S Technical Specifications
| Model | Airtac MID Series Double Rod Mini Cylinder MID8X40S |
|---|---|
| Series | MID ISO 6432 mini cylinder |
| Bore size | Ø8 mm |
| Stroke | 40 mm |
| Acting type | Double acting, double rod |
| 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 19 N |
| 0.7 MPa | 26 N |
| Max (@1.0 MPa) | 4 kgf |
Double-rod: a rod exits both covers, so output force is equal in both directions (rod-side area used).
Model Code: Airtac MID Series Double Rod Mini Cylinder MID8X40S
| MID | ISO 6432 round-body mini cylinder (double-rod). |
|---|---|
| 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 MID Series Double Rod Mini Cylinder MID8X40S Is Used
Micro Part Ejection
Uses the equal 18.8 N force to push small electronic components reliably from a fixture, with the twin rod preventing twist during the stroke.
Symmetric Shuttle Tripping
The rear rod end actuates an external mechanical switch or flag while the front rod drives the primary 1 kg load, saving space on external actuators.
Light Lab Dispensing
Stainless construction handles mild laboratory washdowns while the 40 mm stroke precisely lowers a dispensing head with steady, anti-rotation guidance.
Is the Airtac MID Series Double Rod Mini Cylinder MID8X40S the Right Cylinder?
When sizing this 8 mm bore unit, remember its equal both-ways force is 18.8 N at 0.5 MPa (26.4 N at 0.7 MPa). If your application requires less force, there is no smaller MID bore available, so you would need to reduce operating pressure. If you need more power, stepping up to the MID16X50 provides 86.4 N at 0.5 MPa. The through-rod configuration is ideal when you need anti-rotation stability or want to drive a second load from the back rod end.
For mounting, you can use LB foot, FA flange, or TC trunnion brackets, but the SDB pivot-block is not available on this double-rod variant. The included -S magnet allows you to fit CMSG, DMSG, or EMSG sensors directly. Remember that a standard cylinder drifts if air pressure drops, so never rely on the fixed TPU bumpers to hold a load vertically.
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 MID Series Double Rod Mini Cylinder MID8X40S FAQ
Because it is a double-rod cylinder, the force is equal both ways. It provides 18.8 N at 0.5 MPa, 26.4 N at 0.7 MPa, and a maximum theoretical force of 3.8 kgf at 1.0 MPa. It uses an M5x0.8 port.
Yes, the -S suffix means it has a built-in piston magnet, allowing you to mount CMSG, DMSG, or EMSG switches. The double-rod design also resists rotation, ensuring sensors track consistently.
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