Airtac MFJ Adjustable Mini Cylinder MFJ25X120-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X120-50S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 120mm 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
- Stroke120 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 MFJ25X120-50S
Trimming the extend stroke by up to 50 mm directly at the machine, this double-acting AirTAC MFJ25X120-50S mini cylinder lets you dial in the exact end position between 70 and 120 mm without swapping hardware. The riveted SUS304 stainless round body and aluminium covers form a JIS-standard assembly that is physically shorter than an equivalent ISO 6432 unit, saving valuable mounting length while resisting mild washdown corrosion.
Operating on a 1/8" port with a Ø10 mm rod (M10x1.25 male thread), the 25 mm bore generates 245.3 N of push force at 0.5 MPa. That translates to a safe working load of roughly 147 N, or lifting about 12.5 kg vertically with a 2:1 safety margin. Because the -S suffix includes a piston magnet, you can mount CMSG, DMSG, or EMSG switches for position sensing.
Airtac MFJ Adjustable Mini Cylinder MFJ25X120-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X120-50S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 120 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 MFJ25X120-50S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×120 | 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 MFJ25X120-50S Is Used
Changeover Stations
Fine-tune the 70 to 120 mm extend position on the fly during product format changes, using the external adjuster to set new end stops without machining new hard stops.
Prototype Rigs
Safely test end-of-travel locations for new automated tooling, dialing in the exact 245.3 N push distance during trial fits before finalizing the mechanical layout.
Variable Position Stops
Act as an adjustable hard stop for lightweight parts handling, leveraging the roughly 12.5 kg vertical lift capacity to push components into varying fixture depths.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X120-50S the Right Cylinder?
When sizing this series, compare the real thrust: the MFJ20 bore delivers 157 N of push force at 0.5 MPa, while stepping up to the MFJ32 bore provides 402.2 N. This MFJ25 sits comfortably in the middle at 245.3 N, making it ideal for medium-duty positioning. The 50 mm adjustable window is specifically useful during line changeovers or trial fits where the final extend position is not yet finalized.
Keep in mind the fixed TPU bumper pads only decelerate the stroke end; they do not lock the load. If air pressure drops, the piston will drift, so fit an external rod lock or pilot check valve for suspended loads. For mounting, choose LB foot, FA flange, or TC trunnion brackets (SDB is not available on this build).
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 MFJ25X120-50S FAQ
This 25 mm bore cylinder features a 1/8" port and a Ø10 mm rod. At 0.5 MPa it provides 245.3 N push and 206.1 N pull force. At 0.7 MPa it provides 343.4 N push and 288.5 N pull. The theoretical maximum force is 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm on-site, giving a usable extend range of 70 to 120 mm; the retract stroke remains full length. The -S suffix means a piston magnet is built-in for CMSG, DMSG, or EMSG sensors. Fixed TPU bumpers absorb end impacts, but note this is 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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