Airtac MTF Mini Cylinder MTF20X40U
The AirTAC Airtac MTF Mini Cylinder MTF20X40U is a genuine single acting, pull (spring return) JIS-standard round-body mini air cylinder with a Ø20mm bore and 40mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel for mildly corrosive environments. For the same bore and stroke it is shorter than an ISO 6432 cylinder, saving mounting space.
- BoreØ20 mm
- Stroke40 mm
- Port size1/8"
- Acting typeSingle acting, pull (spring return)
- Rod threadM8×1.25
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MTF Mini Cylinder MTF20X40U
Generating 93.4 N of pull at 0.5 MPa, the AirTAC MTF20X40U is a JIS-standard round-body mini cylinder built for single-acting tensioning. An internal spring constantly pushes the 8 mm rod outward, while supplying air to the 1/8" port retracts it. This fail-safe-to-extended behavior makes the unit inherently reliable for spring-open / air-close operations. The SUS304 stainless barrel shrinks mounting length compared to ISO 6432 equivalents and resists mild washdown corrosion.
Because the quoted force is already net of the spring, you can confidently apply it to vertical lifts; with a 2:1 safety margin, it effectively pulls and holds about 4.8 kg. This base SKU lacks a magnet, so it cannot accept CMSG, DMSG, or EMSG position sensors. End-of-stroke deceleration is handled by fixed TPU bumper pads rather than an adjustable cushion, and the U flat-end rear cover provides a straightforward mounting face.
Airtac MTF Mini Cylinder MTF20X40U Technical Specifications
| Model | Airtac MTF Mini Cylinder MTF20X40U |
|---|---|
| Series | MTF JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 mm |
| Acting type | Single acting, pull (spring return) |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Cushion | Fixed TPU bumper pads |
| Max standard stroke | Up to 150 mm |
Specifications follow the official AirTAC MF/MFC (JIS-standard) datasheet. Barrel: SUS304 stainless steel; covers: aluminum alloy (round-body, riveted rolling-packed construction). Thread options: PT (blank) / G / NPT.
Theoretical Output Force (Ø20mm)
| Pressure | Pull force (spring return) |
|---|---|
| 0.5 MPa | 93.4 N |
| 0.7 MPa | 146.1 N |
Single-acting pull: the spring extends the rod; air retracts it. Forces already net the spring; minimum working pressure is 0.2 MPa.
Model Code: Airtac MTF Mini Cylinder MTF20X40U
| MTF | JIS-standard round-body mini cylinder (single-acting pull, spring-return). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MF-family variants: MF / MFC (double acting ±cushion), MSF / MTF (single acting push / pull), MFD / MFCD (double rod ±cushion), MFJ / MFCJ (adjustable stroke ±cushion). Back covers CA / U / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MTF Mini Cylinder MTF20X40U Is Used
Tension Control
Pulls webbing or filaments tight with 93.4 N of net force, releasing the tension instantly when air pressure is dropped.
Fail-Safe Lid Opening
Holds a cover open via spring pressure; applying air to the 1/8" port pulls the 8 mm rod inward to close it securely.
Part Retraction
Withdraws a small tool or stop pin out of the workspace on command, relying on the internal spring to push it back during an air loss.
Is the Airtac MTF Mini Cylinder MTF20X40U the Right Cylinder?
When sizing this 20 mm bore, step up to the MTF25 (153.6 N @0.5 MPa) if your tensioning load exceeds the 93.4 N rating. As the smallest available bore in the series, there is no smaller MTF downsize. This pull-type design fits applications requiring a return-to-extended fail-safe state, provided you maintain the 0.2 MPa minimum pressure required to overcome the spring. Mounting is versatile via LB foot, FA flange, or TC trunnion brackets, but note that this specific configuration ships without the -S magnet, ruling out direct sensor integration.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/CM) & mount (LB/FA/SDB/TC)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.2 – 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/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MTF Mini Cylinder MTF20X40U FAQ
The 20 mm bore generates a net pull force of 93.4 N at 0.5 MPa and 146.1 N at 0.7 MPa. You must supply at least 0.2 MPa to overcome the internal spring, with a maximum operating pressure of 1.0 MPa.
The spring constantly extends the rod, meaning the cylinder fails to the extended position if air pressure is lost. It cannot hold a mid-stroke load, and this non-magnetized SKU cannot accept position sensors.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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