Airtac MSF Single Acting Mini Cylinder MSF40X25U
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF40X25U 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 MSF40X25U
Delivering a robust 535.3 N of push force at 0.5 MPa (786.5 N at 0.7 MPa), this AirTAC mini cylinder uses compressed air to extend the rod and an internal spring to retract it. Because it is single-acting, you only plumb one 1/4" port, simplifying valve requirements while ensuring the U flat-end rear cover unit fails safely to the retracted position on air loss. The quoted force is already net of the return spring.
Built as a JIS-standard round-body unit with a SUS304 stainless barrel and riveted aluminium covers, it occupies a shorter envelope than an ISO 6432 cylinder of the same 40 mm bore and 25 mm stroke. The fixed TPU bumper pads absorb end-of-stroke impact without needing adjustment. For practical sizing, expect a safe working load around 321 N, or a vertical lift capacity of about 27.3 kg with a 2:1 margin.
Airtac MSF Single Acting Mini Cylinder MSF40X25U Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF40X25U |
|---|---|
| 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 MSF40X25U
| 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 MSF40X25U Is Used
Heavy Part Ejection
Uses the 535.3 N thrust to positively eject dense machined metal components from a fixture, relying on the spring to reset the plunger.
High-Force Clamping
Secures heavy workpieces during machining, with the single-acting design ensuring the clamp releases automatically if air pressure drops.
Vertical Lift Gates
Raises lightweight material handling gates against gravity, safely lowering them back to the retracted rest state when the air signal ceases.
Is the Airtac MSF Single Acting Mini Cylinder MSF40X25U the Right Cylinder?
When sizing this 40 mm bore model, compare it directly against the smaller MSF32, which yields 323.3 N at 0.5 MPa; stepping up here provides the extra thrust for heavier clamping or ejecting. As this is the largest available MSF bore, you cannot scale further within the series. Ensure your supply stays at or above the 0.2 MPa floor, otherwise the internal spring will overpower the air and prevent extension. Choose LB foot, FA flange, SDB pivot, or TC trunnion mounts to suit your frame. Note that this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG position 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 MSF Single Acting Mini Cylinder MSF40X25U FAQ
It generates 535.3 N of push force at 0.5 MPa and 786.5 N at 0.7 MPa. Because it is single-acting with a spring return, you must supply at least 0.2 MPa to overcome the internal spring and extend the rod.
No, this specific SKU does not include a magnet. You must order the -S variant to use CMSG, DMSG, or EMSG magnetic switches. Additionally, the SUS304 stainless barrel resists mild corrosion, and the spring ensures the rod retracts on air loss rather than holding a mid-stroke load.
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