Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50S 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 MFJ25X125-50S
Trimming the extend stroke by up to 50 mm on site, this double-acting JIS-standard round-body mini cylinder lets you dial in the exact 75 to 125 mm end position without swapping hardware. The SUS304 stainless barrel and riveted aluminium covers yield a shorter mounting envelope than an equivalent ISO 6432 unit, resisting mild washdown corrosion. A 1/8" port feeds the 25 mm bore, generating 245.3 N of push force at 0.5 MPa.
Because the -S suffix equips the piston with a magnet, you can bolt CMSG, DMSG or EMSG switches directly on for position sensing. Factoring a 60 percent safety margin against the 0.5 MPa push rating yields a safe working load near 147 N, or roughly 12.5 kg of vertical lift with a 2:1 ratio. Fixed TPU bumpers absorb end-of-stroke impacts across the 30-800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50S |
|---|---|
| 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 MFJ25X125-50S
| 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 MFJ25X125-50S Is Used
Changeover Dial-In
Rotate the external adjuster to shorten the extend stroke by up to 50 mm during product changeovers, hitting new push positions instantly without remounting the cylinder.
Prototype Stroke Setup
Perfect for R&D rigs where the exact extension is unknown; tweak the 75 to 125 mm travel window on the fly while moving a 12.5 kg vertical test mass.
Variable Position Stops
Replace hard external stops with the integrated adjuster to fine-tune the end position for delicate 147 N pressing or locating tasks.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X125-50S the Right Cylinder?
Choosing between the available bores comes down to force: the 20 mm variant supplies 157 N of push at 0.5 MPa, this 25 mm unit provides 245.3 N, and the 32 mm hits 402.2 N. The external adjuster is invaluable for trial fits and line changeovers where the final extend target is unknown, letting you shorten the stroke window without external stops. Mount via LB foot, FA flange or TC trunnion (no SDB option exists here).
Remember that fixed bumpers only decelerate the stroke end; they do not lock the rod. If air pressure drops, the piston drifts, so clamp a held load with an external rod lock or pilot check valve. The built-in magnet (-S) is ready for CMSG/DMSG/EMSG sensors.
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 MFJ25X125-50S FAQ
This 25 mm bore cylinder features a 1/8" port and a 10 mm rod with an M10x1.25 male thread. It generates 245.3 N push and 206.1 N pull at 0.5 MPa, 343.4 N push and 288.5 N pull at 0.7 MPa, with a theoretical maximum of 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm (usable range 75-125 mm) without adding stroke; retract remains full. The -S suffix means a piston magnet is built-in for CMSG, DMSG or EMSG sensors. Fixed TPU bumpers decelerate the ends, but do not lock the load.
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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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