Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-40S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-40S is a genuine double acting, adjustable stroke + cushion 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 + cushion
- Rod threadM10×1.25
- CushionVariable air cushion, both ends
- 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 MFCJ Adjustable Mini Cylinder MFCJ25X125-40S
Dial in exact extend positions and absorb high-speed impact with the AirTAC MFCJ25X125-40S, a JIS-standard round-body mini cylinder. An external adjuster lets you shorten the extend stroke by up to 40 mm on-site (usable range 85-125 mm), while needle-set variable air cushions at both ends soak up end-of-stroke shock. Built with a SUS304 stainless barrel and riveted aluminium covers, it resists mild corrosion and washdowns while saving mounting length compared to an ISO 6432 unit.
Driven by a 10 mm piston rod and 1/8" port, this double-acting actuator delivers 245.3 N push force at 0.5 MPa. The built-in magnet (-S) supports CMSG, DMSG, or EMSG switches for position feedback. For sizing context, it yields a safe working load of roughly 147 N, lifting about 12.5 kg vertically with a 2:1 margin. Note that the cushion only decelerates the load; use an external rod lock or pilot check valve if you need to hold position on air loss.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-40S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-40S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 125 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| 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 | Variable air cushion, both ends |
| 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 MFCJ Adjustable Mini Cylinder MFCJ25X125-40S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 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 MFCJ Adjustable Mini Cylinder MFCJ25X125-40S Is Used
Adjustable Tooling Stops
Fine-tune the extend endpoint within the 40 mm window during high-speed changeovers, letting the 245.3 N thrust position parts without swapping hard stops.
Soft-Stop Diverters
Use the needle variable air cushion to decelerate the 125 mm stroke smoothly at high speed, preventing impact damage when routing lightweight goods.
Washdown Pushers
Leverage the SUS304 stainless barrel and riveted aluminium covers to push 12.5 kg loads in damp or rinse-down packaging areas without premature corrosion.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-40S the Right Cylinder?
Choosing between bores means matching force to mass: the MFCJ20 provides 157 N @0.5 MPa for light loads, this MFCJ25 hits 245.3 N @0.5 MPa, and the MFCJ32 jumps to 402.2 N @0.5 MPa for heavier tooling. Pick this 25 mm bore when you need mid-range thrust plus on-the-fly stroke tuning for changeovers. The 40 mm adjust window is perfect for trial fits where the exact extend endpoint varies, and the variable air cushion prevents bounce at 30-800 mm/s speeds.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover here). Because this is an -S model, you can directly fit CMSG, DMSG, or EMSG sensors. Remember that the adjuster sets the end position rather than locking mid-stroke, so plan external holding valves for fail-safe load control.
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 MFCJ Adjustable Mini Cylinder MFCJ25X125-40S FAQ
This 25 mm bore cylinder has a 1/8" port, a 10 mm rod, and a 125 mm base stroke. Force output is 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. The theoretical maximum force is 50 kgf at 1.0 MPa. The external adjuster allows you to shorten the extend stroke by up to 40 mm.
No. The variable air cushion only decelerates the piston near the stroke end; it is not a brake or lock. The external adjuster sets the end position but cannot lock the rod mid-travel. If the air supply drops, the piston will drift. For load holding, install an external rod lock or pilot-operated check valve. The -S magnet supports CMSG/DMSG/EMSG sensors for end-position feedback.
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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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