Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-20S 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 MFCJ25X125-20S
Dial in exact extend positions on-site with the AirTAC MFCJ25X125-20S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 20 mm (yielding a 105-125 mm usable window), while needle-set variable air cushions at both ends soak up high-speed end-of-stroke shock. The -S suffix equips the piston with a magnet for position sensing.
Operating at 0.15-1.0 MPa on a 1/8" port with a Ø10 mm rod (M10x1.25 male thread), this double-acting actuator delivers 245.3 N push and 206.1 N pull at 0.5 MPa. It yields a safe working load of roughly 147 N, lifting about 12.5 kg vertically with a 2:1 margin. For the same bore and stroke, this compact body is shorter than an ISO 6432 cylinder, saving valuable mounting length without claiming ISO compliance.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-20S |
|---|---|
| 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 MFCJ25X125-20S
| 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 MFCJ25X125-20S Is Used
Adjustable Tooling Stops
Fine-tune the 105-125 mm extend position on machining fixtures to accommodate part variations, relying on the 245.3 N push force to hold components securely during clamping.
High-Speed Diverters
Sort lightweight goods at speed while the variable air cushion silently absorbs end-of-stroke impact, preventing damage to the 12.5 kg payload limit.
Carton Forming Pushers
Adjust the stroke by up to 20 mm on-site to perfect flap folding depth during format changeovers, ensuring precise positioning without re-mounting the cylinder.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X125-20S the Right Cylinder?
Selecting the right bore requires weighing actual thrust: this 25 mm bore pushes 245.3 N at 0.5 MPa, sitting between the smaller MFCJ20 at 157 N and the larger MFCJ32 at 402.2 N. Choose the 25 mm when you need moderate force for high-speed changeovers or shock-sensitive trial fits where both the end position and deceleration require on-site tuning. The external adjuster sets the extend endpoint, and the variable air cushion decelerates the load near stroke end.
Remember that the cushion is not a lock or brake; the piston drifts if air pressure drops. For vertical or suspended loads that must hold position on air loss, 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). Because this SKU includes the -S magnet, you can directly fit CMSG, DMSG, or EMSG reed or electronic switches.
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 MFCJ25X125-20S FAQ
This double-acting cylinder features a 1/8" port and a Ø10 mm rod. 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 20 mm (usable range 105-125 mm); retract remains full. Needle-set variable air cushions at both ends decelerate the piston near stroke end to reduce shock. The -S magnet allows CMSG, DMSG, or EMSG sensors to detect position.
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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