Airtac MFCJ Adjustable Mini Cylinder MFCJ25X250-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X250-40 is a genuine double acting, adjustable stroke + cushion 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 + 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 MFCJ25X250-40
Trim the extend stroke by up to 40 mm on site with the MFCJ25X250-40, giving a usable 210-250 mm extension while retract remains full. This double-acting JIS-standard round-body mini cylinder pairs that external adjuster with a needle variable air cushion at both ends to soak up high-speed shock.
The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdowns, while the body is shorter than an ISO 6432 cylinder for the same 25 mm bore and 250 mm stroke. It pushes with 245.3 N and pulls with 206.1 N at 0.5 MPa through a 1/8" port. This yields a safe working load of about 147 N, lifting roughly 12.5 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X250-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X250-40 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 250 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 MFCJ25X250-40
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 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 MFCJ Adjustable Mini Cylinder MFCJ25X250-40 Is Used
High-Speed Forming Press
Dial in the exact 210-250 mm extend position and tune the needle air cushion to absorb the 245.3 N push force impact during rapid metal stamping changeovers.
Package Divert Arm
Adjust the stroke window on the fly to handle varying carton sizes, relying on the variable air cushion to quietly stop the 12.5 kg diverter arm at high speed.
Vertical Lift Gate
Lift light freight gates using the 147 N safe working load, tweaking the 40 mm extend window to match dock heights while the cushion softens the top stop.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X250-40 the Right Cylinder?
When sizing this adjustable family, compare the real 0.5 MPa push forces: the MFCJ20 delivers 157 N, this 25 mm bore hits 245.3 N, and the MFCJ32 jumps to 402.2 N. Choose the 25 mm bore when you need that mid-range thrust for high-speed changeovers or shock-sensitive trial fits where both the end position and the end-of-stroke deceleration need on-site tuning.
Remember that the air cushion only decelerates the piston near the end of travel—it is not a lock or brake. If the load must hold position on air loss, fit an external rod lock or pilot-operated check valve. For mounting, use LB foot, FA flange or TC trunnion brackets. Because this SKU lacks the -S magnet, it cannot take a CMSG, DMSG or EMSG sensor.
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 MFCJ25X250-40 FAQ
This 25 mm bore cylinder uses a 1/8" port and a 10 mm rod with an M10x1.25 male thread. It generates a push force of 245.3 N and a pull force of 206.1 N at 0.5 MPa. At 0.7 MPa, push is 343.4 N and pull is 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG or EMSG switches. You would need the -S variant for sensing. The external adjuster shortens the extend stroke by up to 40 mm, and the variable air cushion decelerates the load at the ends, but neither acts as a mid-stroke lock.
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.
Related AirTAC MFCJ Cylinders
Request a Quote for Airtac MFCJ Adjustable Mini Cylinder MFCJ25X250-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.