Airtac MTF Mini Cylinder MTF40X50SU
The AirTAC Airtac MTF Mini Cylinder MTF40X50SU 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 MTF40X50SU
Delivering a substantial 434.8 N of net pull force at 0.5 MPa, this 40 mm bore single-acting pull cylinder is engineered for heavy-duty tensioning and air-close tasks. As a JIS-standard round-body mini cylinder, its SUS304 stainless barrel and riveted aluminium covers form a compact assembly that is physically shorter than a comparable ISO 6432 unit, saving valuable machine space while resisting mild washdown corrosion.
The internal spring normally holds the piston rod in the extended position; supplying air to the 1/4 inch port retracts the 16 mm rod against the load. Because the spring constantly pushes outward, the cylinder safely fails to the extended state upon air loss. For position sensing, the -S suffix denotes a built-in magnet ready for CMSG, DMSG, or EMSG switches, while the U suffix specifies a flat-end rear cover. Fixed TPU bumper pads absorb end-of-stroke impacts across the 50 mm travel.
Derived from its 0.5 MPa rating, the safe working load is approximately 261 N. In a vertical lift setup with a 2:1 safety margin, it reliably pulls or holds about 22.2 kg.
Airtac MTF Mini Cylinder MTF40X50SU Technical Specifications
| Model | Airtac MTF Mini Cylinder MTF40X50SU |
|---|---|
| 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 MTF40X50SU
| 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 MTF40X50SU Is Used
Heavy-Duty Tensioning
Pulls cables or heavy levers with 434.8 N at 0.5 MPa, automatically releasing the tension back to a resting state via the internal spring when air is removed.
Fail-Safe Gate Control
Holds a large access door open via spring pressure; applying air retracts the 16 mm rod to pull the door closed, ensuring it locks open safely during an air pressure loss.
Vertical Load Retraction
Lifts and holds a 22.2 kg vertical load with a 2:1 safety margin, using compressed air to pull the load upward while the spring guarantees a controlled descent.
Is the Airtac MTF Mini Cylinder MTF40X50SU the Right Cylinder?
When sizing this unit, compare its 434.8 N @0.5 MPa pull force against adjacent bores: the MTF32 provides 266.8 N if your load is lighter, and since 40 mm is the largest available MTF bore, moving to a double-acting MF cylinder is necessary for higher forces. Ensure your air supply maintains at least the 0.2 MPa floor required to overcome the internal spring before retraction can begin.
This single-acting pull configuration is optimal for spring-open / air-close mechanisms and fail-safe-to-extended operations. Mounting flexibility is provided through LB foot, FA flange, SDB pivot, or TC trunnion brackets. Remember that a SKU without the -S magnet cannot accept 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 MTF40X50SU 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. It requires an operating pressure of at least 0.2 MPa to overcome the internal return spring, with a maximum rated pressure of 1.0 MPa and a proof pressure of 1.5 MPa.
The internal spring constantly holds the rod in the extended position, meaning the cylinder fails to the extended state upon air loss. It cannot hold a mid-stroke load; for that, a double-acting MF cylinder with an external rod lock is required. The -S magnet enables CMSG, DMSG, and EMSG sensors.
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