Airtac MSF Single Acting Mini Cylinder MSF40X25SU
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF40X25SU is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 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 MSF40X25SU
Delivering 535.3 N of push force at 0.5 MPa, this AirTAC MSF40X25SU mini cylinder is built for demanding clamping and ejection tasks. It is a single-acting, push-type actuator with a spring return, meaning air extends the rod while an internal spring retracts it. Because it only needs one 1/4" air line, plumbing is simpler and the rod fails to the 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 ISO 6432 unit of the same bore and stroke.
The quoted force is already net of the return spring, which requires a minimum 0.2 MPa operating pressure to overcome. For practical sizing, a safe working load is roughly 321 N, or a vertical lift of about 27.3 kg with a 2:1 margin. This specific SKU includes a built-in piston magnet (-S) for CMSG, DMSG or EMSG position sensing, and features a U flat-end rear cover. Deceleration is handled by fixed TPU bumper pads rather than an adjustable cushion.
Airtac MSF Single Acting Mini Cylinder MSF40X25SU Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF40X25SU |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 MSF40X25SU
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 40 | 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 MSF40X25SU Is Used
Heavy Part Ejection
Uses the 535.3 N push force to positively eject dense machined metal components from a fixture, relying on the spring to safely retract the rod when air is cut.
Package Diverting Gate
Actuates a routing gate on a packaging line; the spring return ensures the gate springs closed to the default lane if the pneumatic signal drops.
Pallet Stop Arm
Holds a safe working load of roughly 321 N to halt pallets at a workstation, with the U flat-end cover allowing flush mounting against the machine frame.
Is the Airtac MSF Single Acting Mini Cylinder MSF40X25SU the Right Cylinder?
When sizing this 40 mm bore, compare it directly against the MSF32, which provides 323.3 N of push at 0.5 MPa. Since 40 mm is the largest bore in the MSF family, you cannot step up further within this series for higher force demands. Choose the single-acting spring-return configuration for operations like part ejection or gating where the load must return to a safe home position upon air loss. Ensure your supply stays at or above the 0.2 MPa floor, otherwise the internal spring will overpower the air pressure and prevent extension. Mounting options include LB foot, FA flange, SDB pivot, and TC trunnion brackets to suit your frame.
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 MSF40X25SU FAQ
The net push force is 535.3 N at 0.5 MPa and 786.5 N at 0.7 MPa. It requires an operating pressure between 0.2 and 1.0 MPa; the 0.2 MPa minimum is necessary to overcome the internal return spring.
No, the spring drives the rod to the fully 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 model also includes a -S magnet for CMSG/DMSG/EMSG sensors.
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