Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50 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 MFJ25X125-50
Trimming the extend end by up to 50 mm on site, this AirTAC MFJ25X125-50 mini cylinder removes the guesswork from line changeovers and trial fits. The external adjuster lets you set the exact end position between 75 and 125 mm without swapping hardware. As a JIS-standard round-body unit, its riveted aluminium covers and SUS304 stainless steel barrel form a shorter envelope than an equivalent ISO 6432 cylinder, saving valuable mounting space.
Delivering 245.3 N of push force at 0.5 MPa, the 25 mm bore handles moderate positioning tasks easily. The 1/8" port and Ø10 mm rod provide stable airflow and rigidity. With a safe working load around 147 N, it lifts about 12.5 kg vertically with a 2:1 margin. Note this SKU lacks a magnet, so it cannot accept CMSG, DMSG, or EMSG switches.
Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50 |
|---|---|
| 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 MFJ25X125-50
| 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 MFJ25X125-50 Is Used
Prototyping Cells
Dial in the exact extend distance during R&D trial fits, shortening the 125 mm stroke by up to 50 mm to find the optimal push position for new jigs.
Changeover Stops
Adapt packaging lines to different carton sizes quickly by turning the external adjuster rather than replacing the entire cylinder assembly.
Medium-Duty Fixturing
Clamp workpieces securely using the 245.3 N push force, fine-tuning the grip reach on the fly to accommodate minor part tolerances.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50 the Right Cylinder?
When sizing this adjustable unit, compare the real thrust figures: the MFJ20 provides 157 N of push force at 0.5 MPa, while the larger MFJ32 jumps to 402.2 N. This MFJ25 sits comfortably in the middle at 245.3 N, making it ideal for medium-duty fixturing. The 50 mm adjustment window is perfect for prototyping cells where the final stop position is still unknown.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the piston. If your load must be held during air loss, install an external rod lock or pilot check valve. For position sensing, you must select the -S magnet variant, as this base SKU cannot take a sensor.
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 MFJ25X125-50 FAQ
This 25 mm bore cylinder features a 1/8" port and a Ø10 mm rod. It generates 245.3 N push and 206.1 N pull at 0.5 MPa, increasing to 343.4 N push and 288.5 N pull at 0.7 MPa. The theoretical maximum force is 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm on site, giving a usable extend range of 75 to 125 mm. It relies on fixed TPU bumper pads to decelerate the end of stroke, not an adjustable air cushion. The cylinder cannot hold a load on air loss; use an external rod lock for that.
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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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