Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH
The AirTAC Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH is a genuine double acting JIS-standard round-body mini air cylinder with a Ø20mm bore and 125mm 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.
- BoreØ20 mm
- Stroke125 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionFixed TPU bumper pads
About the Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH
Generating 157 N of push force at 0.5 MPa, this double-acting AirTAC MF20X125SUH mini cylinder features a 20 mm bore and a 125 mm stroke. Because it is a JIS-standard round-body design, the overall envelope is noticeably shorter than an ISO 6432 cylinder of the same capacity, freeing up valuable space in tight machinery. The SUS304 stainless steel barrel and riveted aluminium covers naturally resist mild corrosion and washdown. This specific SKU includes a -H high-temperature Viton seal, a U flat-end rear cover, and a built-in -S magnet for position sensing.
At the standard 0.5 MPa operating pressure, you can plan for about 94 N of actual work output, which equates to lifting an 8 kg vertical load with a safe 2:1 margin. The piston relies on a heterogeneous two-way seal that retains an oil film for long-term lubrication, while fixed TPU bumper pads and a front-cover anti-impact pad soften the end-of-stroke impact. Air connects via a 1/8" port, and the 8 mm rod features an M8x1.25 male thread for straightforward load attachment.
Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH Technical Specifications
| Model | Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH |
|---|---|
| Series | MF JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Fixed TPU bumper pads |
| Max standard stroke | Up to 500 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH
| MF | JIS-standard round-body mini cylinder (double-acting). |
|---|---|
| 20 | 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 MF20-25 Stainless Steel Mini Cylinder MF20X125SUH Is Used
Small Component Ejection
Uses the 157 N push force at 0.5 MPa to positively eject small moulded plastic parts from an assembly fixture, with the 125 mm stroke providing ample clearance for robotic pickup.
Package Diverting Arm
Actuates a lightweight routing flap on a packaging conveyor, where the shorter JIS body length saves space inside the machine frame and the Viton seal handles occasional heat exposure.
Clamping Mechanism
Secures thin aluminium brackets during a light machining operation, relying on the 8 kg vertical lift capacity to hold the part firmly against a locating stop.
Is the Airtac MF20-25 Stainless Steel Mini Cylinder MF20X125SUH the Right Cylinder?
When sizing this 20 mm bore actuator, consider stepping up to the MF25 if your application requires more force, as the 25 mm bore provides 245.3 N of push at 0.5 MPa compared to this model's 157 N. Since 20 mm is the smallest available bore in the MF series, there is no smaller option to step down to for lighter duties. For this 125 mm stroke length, ensure your mounting arrangement—whether LB foot, FA flange, or TC trunnion—supports the rod adequately to prevent side-loading and premature bending.
The integrated -S magnet allows you to mount CMSG, DMSG, or EMSG sensors for precise end-position detection. Remember that the fixed TPU bumpers only decelerate the piston near the stroke end; they do not function as an adjustable air cushion. If your process demands position holding during a loss of air supply or valve centering, you must add an external rod lock or a pilot-operated check valve, as the piston will drift without air pressure.
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 0.15 – 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 MF20-25 Stainless Steel Mini Cylinder MF20X125SUH FAQ
This 20 mm bore cylinder features a 1/8" air port and an M8x1.25 male rod thread. The double-acting thrust outputs are 157 N push and 131.9 N pull at 0.5 MPa, 219.8 N push and 184.7 N pull at 0.7 MPa, with a theoretical maximum force of 32 kgf at 1.0 MPa.
Yes, the -S suffix indicates a built-in piston magnet, making it fully compatible with CMSG, DMSG, and EMSG reed or electronic switches. The U designation means it has a flat-end rear cover, and combined with the SUS304 stainless barrel and riveted construction, it offers a compact footprint that is shorter than a comparable ISO 6432 cylinder.
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