Airtac MSF Single Acting Mini Cylinder MSF40X20SU
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF40X20SU is a genuine single acting, push (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, push (spring return)
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MSF Single Acting Mini Cylinder MSF40X20SU
Delivering 535.3 N of push force at 0.5 MPa, this MSF40X20SU mini cylinder is built for demanding clamping and ejection tasks. It is a JIS-standard round-body actuator featuring a SUS304 stainless barrel and riveted aluminium covers. Because it is a single-acting push type, air extends the rod while an internal spring retracts it, meaning you only pipe and valve the 1/4" port. This construction is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length.
The quoted force is already net of the return spring, providing a safe working load of roughly 321 N. Vertically, it can lift about 27.3 kg with a 2:1 safety margin. The built-in magnet (-S) supports CMSG, DMSG, and EMSG switches for position sensing, while the U flat-end back cover simplifies direct rear mounting. Fixed TPU bumper pads absorb end-of-stroke impacts across the 50-800 mm/s speed range.
Airtac MSF Single Acting Mini Cylinder MSF40X20SU Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF40X20SU |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push (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 | Push force (spring return) |
|---|---|
| 0.5 MPa | 535.3 N |
| 0.7 MPa | 786.5 N |
Single-acting push: air extends the rod; the return spring retracts it. Forces already net the spring; minimum working pressure is 0.2 MPa.
Model Code: Airtac MSF Single Acting Mini Cylinder MSF40X20SU
| MSF | JIS-standard round-body mini cylinder (single-acting push, 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 MSF Single Acting Mini Cylinder MSF40X20SU Is Used
Heavy-Duty Clamping
Uses its 535.3 N push force to secure heavy metal workpieces during machining, automatically releasing them when air pressure is removed.
Part Ejection
Pushes finished components off a conveyor line with authority, relying on the internal spring to retract the rod quickly for the next cycle.
Pneumatic Gating
Actuates heavy diverter gates on packaging lines, with the U flat-end back cover allowing flush mounting against machine frames.
Is the Airtac MSF Single Acting Mini Cylinder MSF40X20SU the Right Cylinder?
When sizing this 40 mm bore, consider the next size down: the MSF32 offers 323.3 N at 0.5 MPa if your load is lighter, but the MSF40 is the largest available in this series. This model fits applications requiring a spring-return clamp or gate that safely retracts on air loss. Ensure your supply stays at or above the 0.2 MPa floor; below that, the spring wins and the rod will not extend fully. The included -S magnet allows for CMSG/DMSG/EMSG sensor integration, and you can pair it with LB foot, FA flange, SDB pivot, or TC trunnion mounts.
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 MSF Single Acting Mini Cylinder MSF40X20SU FAQ
The single-acting push force is 535.3 N at 0.5 MPa and 786.5 N at 0.7 MPa. Because it is spring-return, it requires a minimum operating pressure of 0.2 MPa to overcome the spring and extend the rod.
No. On air loss, the internal spring drives the rod to the retracted rest position. It cannot hold an arbitrary mid-stroke load. For a held mid-stroke load, use a double-acting MF cylinder with an external rod lock.
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