Airtac MID Series Double Rod Mini Cylinder MID20X40
The AirTAC Airtac MID Series Double Rod Mini Cylinder MID20X40 is a genuine double acting, double rod round-body mini air cylinder with a Ø20mm bore and 40mm stroke, 1/8" 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.
- BoreØ20 mm
- Stroke40 mm
- Port size1/8"
- Acting typeDouble acting, double rod
- Rod threadM8×1.25
- CushionFixed TPU bumper pads
About the Airtac MID Series Double Rod Mini Cylinder MID20X40
Delivering 131.9 N of equal force in both directions, this AirTAC MID20X40 is a double-acting, through-rod mini cylinder built with a stainless-steel round barrel and rod for mild washdown resistance. Because a rod exits both end covers, extend and retract strokes use the same rod-side area, completely eliminating the force differential found in single-rod units. The twin-rod geometry also resists rotation and side load, providing steadier guiding for light jobs without needing an external guide.
Operating at 30-800 mm/s on a 1/8" port with an M8x1.25 male rod thread, it conforms to the ISO 6432 mounting interface for standard mini brackets. This non-magnet SKU cannot host a sensor, but choosing the -S variant enables CMSG, DMSG or EMSG switches. For sizing, a safe working load is roughly 79 N (60% of the 0.5 MPa force), which translates to lifting about 6.7 kg vertically with a 2:1 margin. Fixed TPU bumper pads soften the stroke ends, though they are not a lock.
Airtac MID Series Double Rod Mini Cylinder MID20X40 Technical Specifications
| Model | Airtac MID Series Double Rod Mini Cylinder MID20X40 |
|---|---|
| Series | MID ISO 6432 mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 mm |
| Acting type | Double acting, double rod |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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.
Theoretical Output Force (Ø20mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 132 N |
| 0.7 MPa | 185 N |
| Max (@1.0 MPa) | 27 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 MID20X40
| MID | ISO 6432 round-body mini cylinder (double-rod). |
|---|---|
| 20 | 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 MID20X40 Is Used
Guided Push Stations
The twin-rod anti-rotation feature keeps parts steady during 131.9 N push operations where a single rod might twist under offset loads.
Back-Rod Switch Tripping
The free rear rod end easily strikes an external mechanical flag or limit switch to confirm position without needing internal magnets.
Symmetric Shuttling
Equal force both ways makes this cylinder perfect for transferring 6-7 kg components back and forth between two processing stations.
Is the Airtac MID Series Double Rod Mini Cylinder MID20X40 the Right Cylinder?
When sizing this 20 mm bore, consider the next size down (MID16) which provides 86.4 N at 0.5 MPa, or the next size up (MID25) delivering 206.1 N if your application demands over 131.9 N of equal both-ways force. The through-rod design is ideal when you need anti-rotation stability, want to drive a second load from the back rod end, or need to trip a remote switch externally. Mount using LB foot, FA flange or TC trunnion brackets, or back covers CA, U, R, CM (the SDB pivot-block is not available on this double-rod variant). Remember that a plain cylinder drifts on air loss—the fixed bumpers only decelerate the stroke end, so add an external rod lock or pilot check valve if the load must be held.
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 MID20X40 FAQ
Because it is a double-rod cylinder, force is equal both ways: 131.9 N at 0.5 MPa, 184.7 N at 0.7 MPa, and a maximum theoretical 26.9 kgf at 1.0 MPa. Operating pressure ranges from 0.15 to 1.0 MPa.
No, this specific SKU lacks a magnet and cannot take a sensor. You must select the -S variant to use CMSG, DMSG or EMSG switches. The stainless steel build resists mild corrosion, and fixed TPU bumpers absorb shock.
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