Airtac MSF Single Acting Mini Cylinder MSF20X25SU
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF20X25SU is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø20mm bore and 25mm 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.
- BoreØ20 mm
- Stroke25 mm
- Port size1/8"
- Acting typeSingle acting, push (spring return)
- Rod threadM8×1.25
- CushionFixed TPU bumper pads
About the Airtac MSF Single Acting Mini Cylinder MSF20X25SU
Delivering 117.5 N of push force at 0.5 MPa (181.3 N at 0.7 MPa), this JIS-standard round-body mini cylinder uses a SUS304 stainless barrel and riveted aluminium covers to resist mild washdown environments. Because it is a single-acting push type, compressed air entering the 1/8" port extends the Ø8 mm rod, while an internal spring retracts it. This means you only plumb one air line, and the unit fails to its retracted rest position if air pressure drops. The quoted force is already net of the spring.
For a 20 mm bore, this configuration yields a safe working load of roughly 71 N (about 60% of the 0.5 MPa rating) or a vertical lift capacity of approximately 6 kg with a 2:1 safety margin. The -S suffix equips the piston with a magnet for CMSG, DMSG, or EMSG position sensing, while the U flat-end rear cover provides a simple flush mounting face. Notably, its compact riveted body is shorter than a comparable ISO 6432 cylinder, saving valuable machine space without claiming standard compliance.
Airtac MSF Single Acting Mini Cylinder MSF20X25SU Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF20X25SU |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 mm |
| Acting type | Single acting, push (spring return) |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 (Ø20mm)
| Pressure | Push force (spring return) |
|---|---|
| 0.5 MPa | 117.5 N |
| 0.7 MPa | 181.3 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 MSF20X25SU
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 20 | Bore size in mm. |
| ×25 | 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 MSF20X25SU Is Used
Spring-Return Clamping
Uses the 117.5 N push force to secure light workpieces, automatically releasing them to the retracted position when air is removed.
Parts Ejector
Pushes small components off a line with a 25 mm stroke, relying on the internal spring to reset the rod without needing a second air line.
Flow Gate Diverter
Actuates a short diverter flap; the single-acting design ensures the gate springs back to its closed rest state during any pneumatic failure.
Is the Airtac MSF Single Acting Mini Cylinder MSF20X25SU the Right Cylinder?
When sizing this 20 mm bore unit, verify your load against the 117.5 N push rating at 0.5 MPa. If your application requires more power, step up to the MSF25, which provides 192.8 N at 0.5 MPa; since 20 mm is the smallest available MSF bore, there is no smaller option. Ensure your supply stays at or above the 0.2 MPa floor, otherwise the internal spring will overpower the air and prevent extension. This single-acting design is optimal for simple clamping, ejecting, or gating tasks where the spring return naturally resets the load.
Mounting flexibility is available via LB foot, FA flange, SDB pivot, or TC trunnion brackets. The U flat-end back cover suits direct rear mounting. Keep in mind the fixed TPU bumper pads absorb end-of-stroke impact across the 50-800 mm/s speed range, but this model cannot hold a mid-stroke load on air loss; choose a double-acting MF with an external rod lock if you need position holding.
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 MSF20X25SU FAQ
The net push force is 117.5 N at 0.5 MPa and 181.3 N at 0.7 MPa. Because it is spring-return, you must maintain at least 0.2 MPa of operating pressure to overcome the spring and extend the rod. The maximum pressure is 1.0 MPa.
No. On air loss, the internal spring drives the rod to its fully retracted rest position; it cannot hold an arbitrary mid-stroke load. For position holding, use a double-acting MF cylinder with an external rod lock. This model includes the -S magnet for CMSG/DMSG/EMSG sensors and a U flat-end cover.
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