Airtac MFJ Adjustable Mini Cylinder MFJ25X125-20S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X125-20S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm 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.
- BoreØ25 mm
- Stroke125 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM10×1.25
- 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 MFJ Adjustable Mini Cylinder MFJ25X125-20S
Trimming the extend stroke by up to 20 mm on site, the AirTAC MFJ25X125-20S lets you dial in the end position from 105 to 125 mm without buying a new unit or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless steel barrel and riveted aluminium covers, delivering a body that is physically shorter than an equivalent ISO 6432 cylinder to save mounting length.
Driven by a 1/8" air port and a Ø10 mm piston rod with an M10x1.25 male thread, the 25 mm bore generates 245.3 N of push force at 0.5 MPa. In practical terms, this yields a safe working load of roughly 147 N, letting you lift about 12.5 kg vertically with a 2:1 safety margin. The built-in magnet (-S) supports CMSG, DMSG, and EMSG switches for position sensing.
Airtac MFJ Adjustable Mini Cylinder MFJ25X125-20S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X125-20S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 125 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MFJ Adjustable Mini Cylinder MFJ25X125-20S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | 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 MFJ Adjustable Mini Cylinder MFJ25X125-20S Is Used
Changeover Stations
Fine-tune the 105-125 mm extend endpoint during product format changes without machining new hard stops, operating safely within the 245.3 N push limit.
Prototype Fitments
Dial in the exact extension during R&D trial rigs, using the 20 mm adjuster to find the optimal position before finalising the mechanical layout.
Variable Position Stops
Actuate light clamping or positioning fingers where the end point varies by a few millimetres, leveraging the 12.5 kg vertical lift capacity.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X125-20S the Right Cylinder?
When sizing this series, compare the real thrust outputs: the MFJ20 bore provides 157 N of push force at 0.5 MPa, this MFJ25 hits 245.3 N, and the larger MFJ32 delivers 402.2 N. Choose the 25 mm bore when your mechanism falls safely inside that 147 N safe working load window and you need the 20 mm extend adjuster for trial fits or line changeovers where the exact stroke is not yet final.
Mounting options include LB foot, FA flange, and TC trunnion (there is no SDB or back-cover option on this build). Remember that the fixed TPU bumper pads only decelerate the stroke end; the cylinder does not hold position on air loss, so fit an external rod lock or pilot check valve if you need to arrest a drifting load.
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 MFJ Adjustable Mini Cylinder MFJ25X125-20S FAQ
This 25 mm bore cylinder uses a 1/8" air port and generates 245.3 N push / 206.1 N pull at 0.5 MPa, and 343.4 N push / 288.5 N pull at 0.7 MPa. The theoretical maximum force is 50 kgf at 1.0 MPa, with an operating speed of 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 20 mm (usable extend 105-125 mm); it sets the end position but does not act as a mid-stroke lock. The -S suffix denotes a built-in piston magnet for CMSG/DMSG/EMSG switches, and fixed TPU bumper pads decelerate the stroke ends.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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