Airtac MSF Single Acting Mini Cylinder MSF25X40SU
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF25X40SU is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø25mm bore and 40mm 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
- Stroke40 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 MSF25X40SU
Delivering 192.8 N of push force at 0.5 MPa (290.9 N at 0.7 MPa), this JIS-standard round-body mini cylinder uses a single air line to extend the rod while an internal spring handles retraction. The SUS304 stainless steel barrel and riveted aluminium covers resist mild washdown corrosion, and the U flat-end back cover keeps the overall length short. Because the quoted force is already net of the return spring, you can plan around a safe working load of roughly 116 N or a vertical lift of about 9.8 kg with a 2:1 margin.
The built-in -S piston magnet supports CMSG, DMSG and EMSG position sensing, while fixed TPU bumper pads absorb end-of-stroke impacts across the 50-800 mm/s speed range. Air enters through the 1/8 port to drive the Ø10 mm rod with its M10x1.25 male thread; release the air and the spring immediately pulls the load back to rest.
Airtac MSF Single Acting Mini Cylinder MSF25X40SU Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF25X40SU |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 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 MSF25X40SU
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MSF25X40SU Is Used
Parts Ejection
Pushes finished parts out of a machining fixture with 192.8 N of thrust at 0.5 MPa, relying on the internal spring to retract the rod when air is cut off.
Spring-Return Clamping
Holds workpieces securely during light machining, automatically releasing the clamp to a safe retracted state on any loss of air pressure.
Flow Gate Actuation
Extends a 40 mm stroke diverter gate to redirect packages on a line, using the -S magnet and EMSG sensors to confirm gate position.
Is the Airtac MSF Single Acting Mini Cylinder MSF25X40SU the Right Cylinder?
When sizing this 25 mm bore, step down to the MSF20 (117.5 N at 0.5 MPa) for lighter duties or up to the MSF32 (323.3 N at 0.5 MPa) when you need more thrust. Keep the operating pressure at or above the 0.2 MPa floor so the air can reliably overcome the return spring. The single-acting push design is ideal for simple clamping, ejecting or gating tasks where losing air safely returns the rod to its retracted position. Mounting options include LB foot, FA flange, SDB pivot and TC trunnion brackets.
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 MSF25X40SU FAQ
This single-acting cylinder provides a net push force of 192.8 N at 0.5 MPa and 290.9 N at 0.7 MPa. It requires a minimum operating pressure of 0.2 MPa to overcome the internal return spring, with a maximum pressure of 1.0 MPa and a proof pressure of 1.5 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 mid-stroke holding you need a double-acting MF cylinder with an external rod lock. The -S magnet on this unit allows CMSG, DMSG or EMSG sensors to track its position.
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