Airtac MTF Mini Cylinder MTF40X20U
The AirTAC Airtac MTF Mini Cylinder MTF40X20U is a genuine single acting, pull (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm stroke, 1/4" 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.
- BoreØ40 mm
- Stroke20 mm
- Port size1/4"
- Acting typeSingle acting, pull (spring return)
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MTF Mini Cylinder MTF40X20U
Delivering a robust 434.8 N of pull force at 0.5 MPa, this AirTAC MTF40X20U is a JIS-standard round-body mini cylinder built for single-acting pull operation. An internal spring holds the rod extended at rest, while supplying air to the 1/4 inch port retracts it. Because the spring actively pushes the piston out, the cylinder automatically fails to the extended position upon air loss, making it perfect for spring-open and air-close mechanisms.
The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown environments while keeping the overall body shorter than a comparable ISO 6432 unit. This specific SKU lacks the -S magnet option, so it cannot host CMSG, DMSG, or EMSG sensors. It features fixed TPU bumper pads for end-of-stroke deceleration and a U flat-end rear cover. For sizing context, the 434.8 N pull at 0.5 MPa yields a safe working load of roughly 261 N, or about 22.2 kg of vertical lift with a 2:1 margin.
Airtac MTF Mini Cylinder MTF40X20U Technical Specifications
| Model | Airtac MTF Mini Cylinder MTF40X20U |
|---|---|
| Series | MTF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull (spring return) |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Pull force (spring return) |
|---|---|
| 0.5 MPa | 434.8 N |
| 0.7 MPa | 645.8 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 MTF40X20U
| MTF | JIS-standard round-body mini cylinder (single-acting pull, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MTF40X20U Is Used
Heavy-Duty Tensioning
Utilize the 434.8 N pull force to maintain constant tension on belts or cables, releasing the load only when compressed air retracts the rod.
Fail-Safe-Open Valves
Keep process valves securely open via the internal spring, using the 1/4 inch air port to pull the mechanism closed only during active operation.
Vertical Lift Retraction
Hoist loads up to 22.2 kg against gravity, relying on air pressure to pull the weight downward while the spring safely returns the load to the top.
Is the Airtac MTF Mini Cylinder MTF40X20U the Right Cylinder?
When selecting this 40 mm bore model, compare its 434.8 N pull at 0.5 MPa against the next size down: the MTF32 provides 266.8 N, making this MTF40 the correct choice when the smaller bore lacks the necessary retracting force. As 40 mm is the largest available MTF bore, applications requiring even greater pull must seek alternative solutions. Ensure your air supply meets the 0.2 MPa minimum floor required to overcome the internal spring before retraction can begin.
This cylinder is ideal for tensioning, clamping, or fail-safe-open duties where the load must return to the extended position naturally. The U flat-end rear cover suits direct mounting applications. Because this specific configuration omits the -S magnet, it cannot accept position sensors; if electronic confirmation is required, an -S variant must be specified to enable CMSG, DMSG, or EMSG switches.
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 MTF40X20U FAQ
This single-acting pull cylinder generates 434.8 N of pull force at 0.5 MPa and 645.8 N at 0.7 MPa. It requires a minimum operating pressure of 0.2 MPa to overcome the internal return spring, with a maximum pressure limit of 1.0 MPa.
This specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG sensors. The internal spring constantly extends the rod; air pressure retracts it. Upon air loss, the spring drives the rod back out to the fully extended position.
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