Airtac MSF Single Acting Mini Cylinder MSF25X20SU
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF25X20SU is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø25mm bore and 20mm stroke, 1/8" 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.
- BoreØ25 mm
- Stroke20 mm
- Port size1/8"
- Acting typeSingle acting, push (spring return)
- Rod threadM10×1.25
- CushionFixed TPU bumper pads
About the Airtac MSF Single Acting Mini Cylinder MSF25X20SU
Generating 192.8 N of push force at 0.5 MPa, this AirTAC MSF25X20SU mini cylinder uses compressed air to extend the rod and an internal spring to retract it. Because it is single-acting, you only need to plumb one 1/8" port, simplifying valve requirements and ensuring the cylinder defaults to a safe retracted position on air loss. The SUS304 stainless steel barrel and riveted aluminium covers form a JIS-standard round body that is notably shorter than an equivalent ISO 6432 unit, saving valuable mounting length.
The quoted push force is already net of the return spring, which dictates a 0.2 MPa minimum operating pressure to overcome the internal spring tension. For practical sizing, this bore provides a safe working load of roughly 116 N, or a vertical lift capacity of about 9.8 kg with a 2:1 safety margin. This -S variant includes a built-in piston magnet for position sensing, and the U flat-end rear cover provides a flush mounting surface for tight installations.
Airtac MSF Single Acting Mini Cylinder MSF25X20SU Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF25X20SU |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 20 mm |
| Acting type | Single acting, push (spring return) |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 (Ø25mm)
| Pressure | Push force (spring return) |
|---|---|
| 0.5 MPa | 192.8 N |
| 0.7 MPa | 290.9 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 MSF25X20SU
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 25 | 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 MSF25X20SU Is Used
Spring-Return Clamping
Uses 192.8 N of air-driven push to hold a workpiece, automatically releasing to the retracted position when air pressure is removed.
Part Ejector
Short 20 mm stroke pushes lightweight components off a line, relying on the internal spring to reset quickly for the next cycle.
Vertical Lift Gate
Raises a small diverter gate with a safe working load of roughly 116 N, dropping it back to the rest position on air loss.
Is the Airtac MSF Single Acting Mini Cylinder MSF25X20SU the Right Cylinder?
When sizing this 25 mm bore, evaluate both boundaries: the smaller MSF20 yields 117.5 N at 0.5 MPa, while the larger MSF32 provides 323.3 N at 0.5 MPa. This MSF25X20SU fits applications needing around 192.8 N of push force where a spring-return action is acceptable, such as clamping or ejecting parts. Remember the 0.2 MPa pressure floor; below that, the spring wins and the rod will not extend. Mounting is flexible via LB foot, FA flange, SDB pivot, or TC trunnion brackets, and the included magnet (-S) supports 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 MSF Single Acting Mini Cylinder MSF25X20SU FAQ
The single-acting push force is 192.8 N at 0.5 MPa and 290.9 N at 0.7 MPa. These figures are net of the return spring. It requires a minimum operating pressure of 0.2 MPa to overcome the spring and has a maximum pressure of 1.0 MPa.
No, the spring drives the rod to the retracted position on air loss, so it cannot hold an arbitrary mid-stroke load. For mid-stroke holding, use a double-acting MF cylinder with an external rod lock. This -S model supports CMSG/DMSG/EMSG sensors.
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