Airtac MSF Single Acting Mini Cylinder MSF40X20U
The AirTAC Airtac MSF Single Acting Mini Cylinder MSF40X20U is a genuine single acting, push (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 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 MSF40X20U
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 air to extend the rod and an internal spring to retract it. Because it is single-acting, you only pipe and valve one 1/4" port, which simplifies automation. The quoted force is already net of the return spring, and the U flat-end back cover ensures straightforward mounting.
Built as a JIS-standard round-body unit with a SUS304 stainless steel barrel and riveted aluminium covers, it is shorter than an ISO 6432 cylinder for the same footprint, resisting mild corrosion and washdown environments. This non-magnet SKU cannot take a sensor; adding the -S option enables CMSG, DMSG, or EMSG switches. For sizing reference, a safe working load is roughly 321 N, and it can vertically lift about 27.3 kg with a 2:1 margin.
Airtac MSF Single Acting Mini Cylinder MSF40X20U Technical Specifications
| Model | Airtac MSF Single Acting Mini Cylinder MSF40X20U |
|---|---|
| Series | MSF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 MSF40X20U
| MSF | JIS-standard round-body mini cylinder (single-acting push, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MSF40X20U Is Used
Heavy-Duty Clamping
Use the 535.3 N push force to secure heavy metal workpieces during machining, with the spring ensuring the clamp retracts safely if air pressure drops.
Part Ejection
Eject dense finished parts from a press line, leveraging the robust 40 mm bore and 16 mm rod to strike and clear materials reliably.
Vertical Lifting
Raise lightweight pallets or trays, safely handling loads up to roughly 27.3 kg with a 2:1 safety margin before the spring pulls the arm back down.
Is the Airtac MSF Single Acting Mini Cylinder MSF40X20U the Right Cylinder?
When sizing this 40 mm bore unit, compare it directly against the smaller MSF32, which yields 323.3 N at 0.5 MPa. If your application requires less than 323.3 N, step down to the 32 mm bore, but if you need maximum push, this 40 mm is the largest available in the MSF family. Ensure your supply stays at or above the 0.2 MPa floor, otherwise the internal spring will overpower the air and prevent extension.
This model is ideal for spring-return clamping, ejecting, or gating tasks where the rod must fail to the retracted position on air loss. It features fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable air cushion. Choose LB foot, FA flange, SDB pivot, or TC trunnion mounts to fit your frame, and note that this specific SKU lacks a magnet, so position sensing is unavailable without upgrading to an -S variant.
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 MSF40X20U FAQ
The 40 mm bore generates a net push force of 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 floor is necessary to overcome the internal return spring.
No. On air loss, the spring drives the rod to the retracted position, so it cannot hold an arbitrary mid-stroke load. Additionally, this specific SKU lacks a magnet and cannot accept CMSG, DMSG, or EMSG sensors; you must use the -S variant for position sensing.
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