Airtac MSF Single Acting Mini Cylinder MSF40X125SU
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF40X125SU is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 mm
- Port size1/4"
- Acting typeSingle acting, push (spring return)
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MSF Single Acting Mini Cylinder MSF40X125SU
Delivering 535.3 N of push force at 0.5 MPa (786.5 N at 0.7 MPa), this 40 mm bore pneumatic 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. The quoted force is already net of the return spring, and the unit fails safely to the retracted position on air loss. It features a JIS-standard round-body construction with a SUS304 stainless barrel and riveted aluminium covers, offering a shorter mounting envelope than an ISO 6432 cylinder while resisting mild corrosion and washdown environments.
This specific configuration includes a 125 mm stroke, a flat-end U back cover, and a built-in piston magnet (-S) for position sensing. For sizing, a safe working load is approximately 321 N (about 60% of the 0.5 MPa push force), which translates to clamping or holding roughly 27 kg vertically with a 2:1 safety margin. The 16 mm rod uses an M14x1.5 male thread, and end-of-stroke deceleration is handled by fixed TPU bumper pads rather than an adjustable cushion.
Airtac MSF Single Acting Mini Cylinder MSF40X125SU Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF40X125SU |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MSF40X125SU
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MSF40X125SU Is Used
Heavy-Duty Part Clamping
Uses the 535.3 N push force to secure heavy metal castings during machining, relying on the spring to automatically release the part when air is cut.
Package Diverting Gate
Extends a 125 mm stroke to route dense cartons on a conveyor line, with the flat-end U cover allowing flush mounting against the frame.
Product Ejection Station
Pushes finished goods off an assembly pallet with enough force to overcome friction, safely returning to rest once the ejection cycle completes.
Is the Airtac MSF Single Acting Mini Cylinder MSF40X125SU the Right Cylinder?
When sizing this 40 mm bore model, verify your load requires its 535.3 N @0.5 MPa output. If your application needs less force, the next size down is the MSF32, which provides 323.3 N @0.5 MPa; since 40 mm is the largest available MSF bore, moving up in force requires switching to a different cylinder family. Single-acting push cylinders are ideal for clamping, ejecting, and gating tasks where the spring return naturally resets the mechanism. Ensure your air 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, and the included -S magnet allows direct mounting of CMSG, DMSG, or EMSG 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 MSF40X125SU FAQ
This 40 mm bore cylinder provides a net push force of 535.3 N at 0.5 MPa and 786.5 N at 0.7 MPa. It requires a minimum operating pressure of 0.2 MPa to overcome the internal return spring and extend the rod.
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 you need a double-acting MF cylinder with an external rod lock. This unit includes a -S magnet for CMSG/DMSG/EMSG sensors and fixed TPU bumper pads for end-of-stroke deceleration.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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