Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 300mm 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
- Stroke300 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 MFJ25X300-50
Trimming the extend stroke by up to 50 mm on-site, this double-acting JIS-standard round-body mini cylinder saves you from buying a new unit or adding external stops. The riveted aluminium covers and SUS304 stainless barrel resist mild washdown corrosion, and the body is notably shorter than an ISO 6432 cylinder for the same 25 mm bore and 300 mm stroke.
In the 245.3 N push force class at 0.5 MPa, it yields a safe working load of roughly 147 N and lifts about 12.5 kg vertically with a 2:1 margin. It uses a 1/8" port and a Ø10 mm rod, but because this SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG position switches.
Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 300 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 MFJ25X300-50
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×300 | 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 MFJ25X300-50 Is Used
Changeover Stations
Fine-tune the extend end within the 50 mm window during product line changeovers, accommodating new stops without swapping the 245.3 N cylinder.
Trial Fit Rigs
Dial in the exact extend position on prototype assemblies where the final 250 to 300 mm stroke length is still being evaluated.
Variable Position Stops
Adjust the end-of-stroke contact point on the fly for lightweight 12.5 kg vertical lift tasks without machining new hard stops.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50 the Right Cylinder?
Size by force: the MFJ20 provides 157 N at 0.5 MPa, this MFJ25 hits 245.3 N, and the MFJ32 jumps to 402.2 N. The 50 mm adjuster window is perfect for trial fits and line changeovers where the exact 250 to 300 mm extend position is not final. Retract remains a full 300 mm.
Mounting options include LB foot, FA flange, and TC trunnion, with no SDB or back-cover option. The fixed TPU bumper pads decelerate the stroke end but do not lock the load; for fail-safe holding on air loss, add an external rod lock or pilot check valve.
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 MFJ25X300-50 FAQ
It delivers 245.3 N push and 206.1 N pull at 0.5 MPa, or 343.4 N push and 288.5 N pull at 0.7 MPa, with a theoretical max of 50 kgf at 1.0 MPa. The air port is 1/8", the rod is Ø10 mm with an M10x1.25 male thread, and speed ranges 30-800 mm/s.
An external adjuster shortens the extend stroke by up to 50 mm on-site; it does not add stroke beyond the 300 mm base and does not act as a mid-stroke lock. Fixed TPU bumpers only decelerate the end of travel, so you need an external rod lock or pilot check valve to hold a load on air loss. This SKU has no -S magnet and cannot take a sensor.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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