Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50S 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 MFJ25X300-50S
Trimming the extend end by up to 50 mm on site, this double-acting JIS-standard round-body mini cylinder lets you dial in a 250 to 300 mm stroke without buying a new unit. The SUS304 stainless barrel and riveted aluminium covers form a compact body that is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length. A 1/8" port feeds the 25 mm bore, yielding 245.3 N of push force at 0.5 MPa.
The -S suffix equips the piston with a magnet for CMSG, DMSG or EMSG switches. Fixed TPU bumper pads absorb end-of-stroke impacts across the 30 to 800 mm/s speed range. Based on the 0.5 MPa push rating, the safe working load is roughly 147 N, lifting about 12.5 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50S |
|---|---|
| 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 MFJ25X300-50S
| 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 MFJ25X300-50S Is Used
Variable-Position Stops
Dial in the exact 250 to 300 mm extend length for varying product sizes without machining new hard stops.
Changeover Stations
Speed up line format changes by turning the external adjuster to shorten the extend stroke by up to 50 mm.
Trial Fit Rigs
Safely test end positions and clamp distances on prototypes using the 245.3 N push force before finalizing the design.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X300-50S the Right Cylinder?
Choosing between bores means matching your force needs: the MFJ20 provides 157 N of push at 0.5 MPa, this MFJ25 delivers 245.3 N, and the MFJ32 steps up to 402.2 N. The 50 mm adjustable window is ideal for trial fits and line changeovers where the exact end position is not final. Mounting options include LB foot, FA flange and TC trunnion (no SDB). Remember that the external adjuster only shortens the extend stroke; it does not lock the load. If you need to hold position against 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 MFJ25X300-50S FAQ
This 25 mm bore cylinder uses a 1/8" port. 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.
An external adjuster shortens the extend stroke by up to 50 mm on site, giving a usable 250 to 300 mm range. Fixed TPU bumpers decelerate the stroke end but do not act as a brake. The piston will drift on air loss, so use an external rod lock for load holding. The -S magnet allows CMSG, DMSG or EMSG sensors.
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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