Airtac MSF Single Acting Mini Cylinder MSF40X50U
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF40X50U is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 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 MSF40X50U
Delivering 535.3 N of push force at 0.5 MPa (786.5 N at 0.7 MPa), this 40 mm bore 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 spring resistance, and the U flat-end rear cover provides a flush mounting face for tight spaces.
Built as a JIS-standard round-body mini cylinder with a SUS304 stainless steel barrel and riveted aluminium covers, it is notably shorter than an ISO 6432 unit of the same bore and stroke. The fixed TPU bumper pads absorb end-of-stroke impacts across the 50 mm travel. Based on the 0.5 MPa rating, a safe working load is roughly 321 N, which equates to clamping or lifting about 27 kg vertically with a 2:1 safety margin. This SKU lacks a magnet, so it cannot accept CMSG, DMSG, or EMSG sensors without switching to an -S variant.
Airtac MSF Single Acting Mini Cylinder MSF40X50U Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF40X50U |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MSF40X50U
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MSF40X50U Is Used
Heavy Part Ejection
Uses the full 535.3 N push at 0.5 MPa to knock heavy machined parts out of a fixture, with the spring ensuring the ejector retracts clear of the workspace.
Vertical Lift Gates
Raises a diverter gate holding up to 27 kg with a 2:1 safety margin, relying on gravity and the internal spring to lower the gate when air is removed.
Secure Clamping
Clamps thick workpieces against a stop using 786.5 N at 0.7 MPa, automatically releasing the hold if the air supply drops to prevent workpiece damage.
Is the Airtac MSF Single Acting Mini Cylinder MSF40X50U the Right Cylinder?
If 323.3 N from the MSF32 at 0.5 MPa is insufficient for your clamp, this 40 mm bore is the largest available in the MSF family. It requires at least 0.2 MPa of air pressure to overcome the return spring; below that floor, the spring wins and the rod stays retracted. Choose this single-acting configuration for ejecting or gating tasks where the load must return to a safe position upon air loss. Mounting options include LB foot, FA flange, SDB pivot, and TC trunnion, but note this specific SKU has no magnet and therefore cannot support position sensing.
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 MSF40X50U FAQ
It generates 535.3 N of push force at 0.5 MPa and 786.5 N at 0.7 MPa. The operating pressure range is 0.2 to 1.0 MPa; a minimum of 0.2 MPa is required to overcome the internal return spring. The 1/4" port feeds air to extend the 16 mm rod.
No. On air loss, the spring drives the rod to the fully retracted position, so it cannot hold an arbitrary mid-stroke load. For mid-stroke holding, use a double-acting MF with an external rod lock. Additionally, this SKU lacks a magnet and cannot accept CMSG, DMSG, or EMSG switches.
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