Airtac MFJ Adjustable Mini Cylinder MFJ25X250-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X250-50S 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 MFJ25X250-50S
Trimming the extend end by up to 50 mm on site, the AirTAC MFJ25X250-50S lets you dial in the final position from 200 to 250 mm without buying a new unit or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, giving you a shorter mounting envelope than an ISO 6432 cylinder for the same 25 mm bore and 250 mm stroke.
The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing. Operating at 0.5 MPa, it delivers 245.3 N of push force and 206.1 N of pull force. For practical sizing, this translates to a safe working load of roughly 147 N, or lifting about 12.5 kg vertically with a 2:1 margin. It uses a 1/8" port and fixed TPU bumper pads to decelerate the stroke ends.
Airtac MFJ Adjustable Mini Cylinder MFJ25X250-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X250-50S |
|---|---|
| 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 MFJ25X250-50S
| 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 MFJ25X250-50S Is Used
Changeover Stations
Fine-tune the 200 to 250 mm extend position during product format changes, using the 50 mm window to adapt stops quickly without swapping hardware.
Prototype Set-up Rigs
Ideal for trial assemblies where the exact push point is unknown, letting you safely test motion within the 245.3 N force band before finalising the design.
Variable-Position Stops
Adjust the end of stroke on automated clamps to accommodate different material thicknesses, relying on fixed TPU bumpers to absorb the impact.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-50S the Right Cylinder?
When choosing between the four MFJ bores, compare the actual output: the MFJ20 provides 157 N of push force at 0.5 MPa, this MFJ25 hits 245.3 N, and the MFJ32 jumps to 402.2 N. Because the external adjuster only shortens the extend stroke, this cylinder is perfect for trial fits and line changeovers where the exact end position is not yet finalised.
Remember that the adjuster sets the end stop; it is not a mid-stroke lock. A plain cylinder drifts on air loss, so for a held load you must add an external rod lock or pilot-operated check valve. Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover mount). The -S magnet enables sensors, whereas a plain SKU without S cannot take a switch.
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 MFJ25X250-50S FAQ
This double-acting cylinder has a 25 mm bore, a 10 mm rod, M10x1.25 male rod thread and a 1/8" port. 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. Operating speed is 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 50 mm on site, giving a usable extend range of 200-250 mm; retract remains full. The -S suffix means a piston magnet is built in for CMSG, DMSG or EMSG sensors. It uses fixed TPU bumper pads, not an adjustable air cushion.
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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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Most inquiries answered within 7-8 hours.
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