Airtac MFJ Adjustable Mini Cylinder MFJ25X40-10S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X40-10S is a genuine double acting, adjustable stroke 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
- Rod threadM10×1.25
- CushionFixed TPU bumper pads
- 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 MFJ Adjustable Mini Cylinder MFJ25X40-10S
Trimming the extend stroke by up to 10 mm on site, this double-acting JIS-standard round-body mini cylinder removes the need for external stops during trial fits. The external adjuster lets you fine-tune the end position within a 30 to 40 mm usable window, while the retract stroke remains full. A built-in piston magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing.
Featuring a SUS304 stainless barrel and riveted aluminium covers, the riveted construction is shorter than an ISO 6432 cylinder for the same 25 mm bore and 40 mm stroke, saving valuable mounting length. The 1/8" port and Ø10 mm rod deliver a push force of 245.3 N at 0.5 MPa. This yields a safe working load of roughly 147 N, meaning it lifts about 12.5 kg vertically with a 2:1 margin. Fixed TPU bumper pads decelerate the stroke ends.
Airtac MFJ Adjustable Mini Cylinder MFJ25X40-10S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X40-10S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 mm |
| Acting type | Double acting, adjustable stroke |
| 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 | Fixed TPU bumper pads |
| 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 MFJ Adjustable Mini Cylinder MFJ25X40-10S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 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 MFJ Adjustable Mini Cylinder MFJ25X40-10S Is Used
Changeover Stations
Dial in the 30-40 mm extend position during product line changeovers without machining new hard stops, leveraging the 245.3 N push force for light actuation.
Trial Fit Rigs
Use the 10 mm adjuster window to safely probe the exact extension needed for a new fixture, then lock the external collar once the ideal endpoint is found.
Variable Position Stops
Provide adjustable end-of-stroke positioning for delicate pressing tasks where the 147 N safe working load must be precisely bounded by the TPU bumpers.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X40-10S the Right Cylinder?
When sizing this series, compare the real thrust outputs: the MFJ20 delivers 157 N of push force at 0.5 MPa, while the MFJ32 jumps to 402.2 N. This MFJ25 sits comfortably in the middle at 245.3 N, making it ideal for medium-duty changeover stations. Choose it when the exact extend position is not final during commissioning, as the adjuster handles on-site tweaks without buying a new unit.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover). Because the -S magnet is present, you can directly fit CMSG, DMSG or EMSG sensors. Remember that air pressure does not hold the load if air is lost; the piston drifts and the TPU bumper only decelerates the end of travel. Use an external rod lock or pilot check valve for secure load holding.
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 MFJ Adjustable Mini Cylinder MFJ25X40-10S FAQ
This 25 mm bore cylinder has a 1/8" port and a Ø10 mm rod. 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.
The external adjuster shortens the extend stroke by up to 10 mm on site, giving a usable extend range of 30-40 mm; it does not add stroke beyond the 40 mm base and is not a mid-stroke lock. The cylinder uses fixed TPU bumper pads to decelerate at the stroke ends, not an adjustable air cushion. The included -S magnet enables CMSG, DMSG and EMSG sensors.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
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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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