Airtac MFJ Adjustable Mini Cylinder MFJ25X250-40S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X250-40S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 250mm 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
- Stroke250 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 MFJ25X250-40S
Trimming the extend end by up to 40 mm on site, this double-acting JIS-standard round-body mini cylinder lets you dial in a 210 to 250 mm forward stroke without buying a new unit. The SUS304 stainless barrel and riveted aluminium covers form a compact body that is physically shorter than an ISO 6432 cylinder for the same 25 mm bore and 250 mm stroke, saving valuable mounting length while resisting mild washdown. A built-in piston magnet (-S) is included for position sensing.
Operating at 0.5 MPa, it delivers 245.3 N of push force and 206.1 N of pull. That translates to a safe working load of about 147 N, or lifting roughly 12.5 kg vertically with a 2:1 margin. The 1/8" port and M10x1.25 male rod thread keep the pneumatic and mechanical integration straightforward. Fixed TPU bumper pads absorb end-of-stroke impacts across the 30-800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ25X250-40S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X250-40S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 250 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 MFJ25X250-40S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×250 | 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 MFJ25X250-40S Is Used
Changeover Stations
Dial in the 210-250 mm extend position during product format changes without machining new hard stops, using the 40 mm external adjuster to hit the exact ejection point.
Trial Fit Rigs
Safely test end-of-arm tooling positions under a 147 N safe working load, tweaking the forward stroke on the fly until the kinematics are proven.
Variable Position Stops
Provide adjustable mechanical end-stops for a 12.5 kg vertical lift fixture, relying on the SUS304 barrel for mild corrosion resistance in humid production areas.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-40S the Right Cylinder?
Choosing between bores comes down to your force window: the 20 mm bore gives 157 N of push at 0.5 MPa, this 25 mm bore provides 245.3 N, and the 32 mm bore jumps to 402.2 N. Pick the 25 mm when you need moderate push force in a tight footprint. The 40 mm adjustable window is perfect for trial fits and line changeovers where the exact end position is not yet final. Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Remember that a plain cylinder drifts on air loss; the bumper only decelerates the stroke end and does not lock the load, so specify an external rod lock or pilot check valve if you need to hold position.
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 MFJ25X250-40S FAQ
This 25 mm bore cylinder has a 1/8" port and an M10x1.25 male rod thread. At 0.5 MPa it pushes with 245.3 N and pulls with 206.1 N. At 0.7 MPa the push is 343.4 N and pull is 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa. The base stroke is 250 mm, and the external adjuster can shorten the extend stroke by up to 40 mm.
The external adjuster mechanically shortens the extend end position by up to 40 mm on site, giving a usable forward range of 210-250 mm; the retract stroke remains full. It acts only as an end-stop and does not lock the load mid-stroke. The -S suffix means a piston magnet is built in, allowing you to mount CMSG, DMSG, or EMSG reed or electronic sensors directly for position detection.
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Genuine AirTAC parts produced by AirTAC factory.
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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Most inquiries answered within 7-8 hours.
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