Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-20 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 MFCJ25X40-20
Trim the extend stroke by up to 20 mm on site with this double-acting, adjustable-stroke mini cylinder, which also features a needle variable air cushion at both ends to absorb high-speed shock. The JIS-standard round-body build uses a SUS304 stainless barrel and riveted aluminium covers, giving you a shorter overall length than an ISO 6432 cylinder while resisting mild washdown corrosion. A 1/8" port and M10x1.25 male rod thread equip the 25 mm bore.
Generating 245.3 N of push force at 0.5 MPa (343.4 N at 0.7 MPa), this unit yields a safe working load of about 147 N. It lifts roughly 12.5 kg vertically with a 2:1 margin. Note this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-20 |
|---|---|
| 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 MFCJ25X40-20
| 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 MFCJ25X40-20 Is Used
Light Part Ejection
Tune the 20 mm extend window and dial in the needle air cushion to softly eject 12.5 kg machined parts at high speed without end-of-stroke slamming.
Adjustable Diverter Arm
Set the exact reach for a sorting gate on a packaging line; the 245.3 N push force handles light product redirection while the cushion absorbs rapid reversals.
Lab Test Actuation
Perfect for prototype rigs needing on-site stroke shortening from 40 mm down to 20 mm, letting engineers trial fit movements without machining new hard stops.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X40-20 the Right Cylinder?
When sizing this series, compare the real thrust: the 25 mm bore gives 245.3 N push at 0.5 MPa, sitting neatly between the 157 N of an MFCJ20 and the 402.2 N of an MFCJ32. Choose the 25 mm bore when you need that mid-range force in a compact envelope. The 20 mm adjustable window and dual variable air cushions make it perfect for high-speed changeovers or shock-sensitive trial fits where you must tune both the end position and the deceleration.
Remember the cushion only decelerates the piston near the stroke end—it is not a lock or brake. If the load must be held during air loss or when a valve is centred, the piston will drift; install an external rod lock or pilot-operated check valve. For mounting, use LB foot, FA flange, or TC trunnion brackets (no SDB or back-cover mount exists 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 MFCJ Adjustable Mini Cylinder MFCJ25X40-20 FAQ
This 25 mm bore cylinder features a 1/8" port and an M10x1.25 male rod thread. It delivers 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.
This specific SKU does not have the -S magnet, so it cannot accept CMSG, DMSG, or EMSG magnetic switches. The external adjuster shortens the extend stroke by up to 20 mm (usable range 20-40 mm), while the variable air cushion at both ends uses a needle valve to decelerate the piston near the ends—it is not 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.
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