Airtac MTF Mini Cylinder MTF40X20SU
The AirTAC Airtac MTF Mini Cylinder MTF40X20SU 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 MTF40X20SU
Delivering 434.8 N of net pull force at 0.5 MPa, this AirTAC MTF40X20SU is a JIS-standard round-body mini cylinder built for single-acting pull operation. An internal spring drives the 16 mm rod to its extended rest state, while supplying air to the 1/4" port retracts it. Because the spring holds the rod out, the cylinder fails safely to the extended position upon air loss, making it ideal for spring-open and air-close tasks. The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown environments.
For tensioning applications, the effective pull at 0.5 MPa is roughly 44.3 kgf; applying a 2:1 safety margin means it can reliably pull or hold about 22 kg. This specific SKU includes a U flat-end back cover and a built-in piston magnet (-S), enabling direct mounting of CMSG, DMSG, or EMSG position switches. The compact riveted body is notably shorter than an ISO 6432 cylinder of the same bore and stroke, saving valuable mounting length without ever conforming to that standard.
Airtac MTF Mini Cylinder MTF40X20SU Technical Specifications
| Model | Airtac MTF Mini Cylinder MTF40X20SU |
|---|---|
| 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 MTF40X20SU
| 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 MTF40X20SU Is Used
Heavy Tensioning
Pulls cables or heavy levers with 434.8 N at 0.5 MPa, releasing tension only when air is applied to retract the rod.
Fail-Safe-Open Valves
Holds a process valve open via spring force; air retracts the rod to close it, ensuring the valve opens automatically on air loss.
Retracting Stop Gates
Uses the 645.8 N pull at 0.7 MPa to retract heavy physical stops or gates, allowing the spring to push the barrier back out at rest.
Is the Airtac MTF Mini Cylinder MTF40X20SU the Right Cylinder?
When sizing this 40 mm bore, evaluate both ends of the range: if 434.8 N at 0.5 MPa is excessive, step down to the MTF32 which provides 266.8 N. As 40 mm is the largest available MTF bore, there is no larger standard option for higher pull requirements. This single-acting pull design fits perfectly when you need air to retract a load and a spring to return it, such as tensioning or fail-safe-open mechanisms. Ensure your air supply meets the 0.2 MPa minimum floor required to overcome the spring force. Alongside the U flat-end rear cover, you can mount the body using LB foot brackets, FA flanges, SDB pivot blocks, or TC trunnions.
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 MTF40X20SU FAQ
This 40 mm bore cylinder provides a net pull force of 434.8 N at 0.5 MPa and 645.8 N at 0.7 MPa. The operating pressure ranges from 0.2 to 1.0 MPa, with a 0.2 MPa minimum required to overcome the return spring. It features a 1/4" port and a 16 mm rod.
The internal spring constantly extends the rod, so air only retracts it. On air loss, the spring drives the rod to the fully extended position; it will not hold a mid-stroke load. This SKU includes the -S magnet for CMSG, DMSG, or EMSG sensors, and features a U flat-end back cover.
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