Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-30
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-30 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø25mm bore and 40mm 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
- Stroke40 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 MFCJ25X40-30
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ25X40-30. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, offering a shorter mounting length than an ISO 6432 unit of the same bore and stroke.
The double-acting mechanism uses an external adjuster to shorten the extend stroke by up to 30 mm, while needle variable air cushions at both ends soak up end-of-stroke impact. Delivering 245.3 N push force at 0.5 MPa via a 1/8" port, it yields a safe working load of roughly 147 N. Note this SKU lacks a magnet, so it cannot accept CMSG/DMSG/EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-30 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-30 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 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 MFCJ25X40-30
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MFCJ25X40-30 Is Used
High-Speed Component Pressing
Tune the 30 mm extend window to trial-fit delicate bearings, letting the variable air cushion decelerate the 245.3 N thrust for damage-free seating.
Adjustable Transfer Diverter
Fine-tune the actuation reach on the fly during product changeovers, absorbing high-speed impacts at stroke end to keep the 147 N working load stable.
Variable Stroke Flap Control
Shorten the extend stroke on-site to match different carton depths, relying on the needle cushion to prevent end-cap slamming at 800 mm/s.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-30 the Right Cylinder?
When sizing this series, compare the real thrust outputs: the 25 mm bore provides 245.3 N push at 0.5 MPa, sitting neatly between the MFCJ20 at 157 N and the MFCJ32 at 402.2 N. Choose the 25 mm bore when you need approximately 147 N of safe working load, or step up to the 32 mm bore for heavier dynamics. The 30 mm adjustable window is perfect for changeovers where the exact extend point and end-of-stroke shock both 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 application must hold a vertical load during air loss, add an external rod lock or pilot check valve. For mounting, use LB foot, FA flange, or TC trunnion brackets (no SDB or back cover is available). Because this specific SKU has no -S magnet, position sensing is not possible without upgrading to the magnet-equipped variant.
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 MFCJ25X40-30 FAQ
This 25 mm bore double-acting cylinder features a 1/8" port and a 10 mm rod. At 0.5 MPa it pushes 245.3 N and pulls 206.1 N. At 0.7 MPa it pushes 343.4 N and pulls 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 must select the -S variant for position sensing. The external adjuster shortens the extend stroke by up to 30 mm, and the variable air cushion handles deceleration, but neither feature locks the piston mid-stroke.
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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.
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Most inquiries answered within 7-8 hours.
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