Airtac MTF Mini Cylinder MTF40X50U
The AirTAC Airtac MTF Mini Cylinder MTF40X50U is a genuine single acting, pull (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port size1/4"
- Acting typeSingle acting, pull (spring return)
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MTF Mini Cylinder MTF40X50U
Delivering a substantial 434.8 N of pull force at 0.5 MPa (645.8 N at 0.7 MPa), this JIS-standard round-body mini cylinder is built for heavy-duty tensioning and retraction tasks. The MTF40X50U uses a SUS304 stainless barrel with riveted aluminium covers, resisting mild corrosion and washdown environments. Because it is a single-acting pull design, an internal spring holds the rod extended at rest, and applying air to the 1/4" port retracts it. This fail-safe behavior drives the rod out upon air loss, making it ideal for spring-open applications. The U flat-end back cover provides a flush rear mounting surface.
For sizing utility, the quoted pull force is already net of the spring resistance, yielding a safe working load of about 261 N (roughly 60 percent of the 0.5 MPa rating). In vertical lifting scenarios with a 2:1 safety margin, it effectively pulls or holds around 22.2 kg. This specific SKU lacks a magnet, so it cannot accept CMSG, DMSG, or EMSG position sensors; adding the -S variant enables that capability. Fixed TPU bumper pads manage end-of-stroke deceleration across its 50 mm travel.
Airtac MTF Mini Cylinder MTF40X50U Technical Specifications
| Model | Airtac MTF Mini Cylinder MTF40X50U |
|---|---|
| Series | MTF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MTF40X50U
| MTF | JIS-standard round-body mini cylinder (single-acting pull, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MTF40X50U Is Used
Heavy-Duty Tensioning
Pulls and maintains cables or belts tight with a 434.8 N force at 0.5 MPa, releasing tension only when compressed air retracts the rod.
Spring-Open Valve Control
Keeps a large flow valve open via spring pressure and shuts it pneumatically, ensuring the valve defaults to an open state during air pressure loss.
Vertical Load Retraction
Lifts and holds loads up to approximately 22.2 kg against gravity using a 2:1 safety margin, relying on air to pull the weight upward.
Is the Airtac MTF Mini Cylinder MTF40X50U the Right Cylinder?
When sizing this 40 mm bore, compare its 434.8 N @0.5 MPa pull capacity against the next size down: the MTF32 provides 266.8 N @0.5 MPa. Since 40 mm is the largest available MTF bore, you cannot step up within this series for higher force. Ensure your air supply provides at least the 0.2 MPa floor required to overcome the internal spring before retraction begins.
This single-acting pull configuration fits mechanisms needing a fail-safe extended state, such as tensioning gates or holding brakes open via spring pressure and closing them pneumatically. Mounting options include LB foot, FA flange, SDB pivot, and TC trunnion brackets. Remember that this non-magnet version cannot support sensing switches; choose an -S model if you require CMSG, DMSG, or EMSG sensors.
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 MTF40X50U FAQ
It delivers a net pull force of 434.8 N at 0.5 MPa and 645.8 N at 0.7 MPa. A minimum operating pressure of 0.2 MPa is required to overcome the internal return spring. The cylinder operates up to 1.0 MPa with a 1.5 MPa proof pressure.
The internal spring constantly pushes the rod to the extended position. If air pressure is lost, the spring forces the rod fully out, failing to the extended state. It cannot hold a mid-stroke load; use a double-acting MF cylinder with an external rod lock for that.
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