Airtac MFJ Adjustable Mini Cylinder MFJ40X25-10
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X25-10 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 25mm stroke, 1/4" 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.
- BoreØ40 mm
- Stroke25 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- 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 MFJ40X25-10
Trimming the extend stroke by up to 10 mm on site, this adjustable double-acting mini cylinder lets you dial in the exact end position without buying a new unit or adding external stops. The usable extend range is 15-25 mm, while retract remains full, making it ideal for trial fits and line changeovers where the final position is not yet locked in.
Built as a JIS-standard round-body unit with a SUS304 stainless barrel and riveted aluminium covers, the body is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length. The 40 mm bore delivers 628.3 N of push force at 0.5 MPa, yielding a safe working load of roughly 377 N or a vertical lift of about 32 kg with a 2:1 margin. It uses a 1/4" port, a 16 mm rod, and fixed TPU bumper pads for end deceleration.
Airtac MFJ Adjustable Mini Cylinder MFJ40X25-10 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X25-10 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MFJ40X25-10
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 MFJ40X25-10 Is Used
Changeover Stations
Fine-tune the 15-25 mm extend position during product format changes, using the 628.3 N push force to seat medium-weight fixtures without adding external mechanical stops.
Trial Fit Rigs
Dial in the exact end-of-stroke contact point on prototype assemblies, leveraging the 10 mm adjustment window to test multiple positions before finalizing the layout.
Variable Position Stops
Serve as an adjustable hard stop for 40 mm bore tooling, providing 527.8 N of pull force at 0.5 MPa to retract the stop cleanly when the cycle finishes.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X25-10 the Right Cylinder?
When sizing these cylinders, compare the real thrust figures: this MFJ40 bore pushes 628.3 N and pulls 527.8 N at 0.5 MPa, whereas the smaller MFJ32 bore delivers 402.2 N of push force at the same pressure. Choose the 40 mm bore when your application demands lifting or moving roughly 32 kg vertically with a 2:1 safety margin, and step down to the 32 mm bore for lighter loads. Both options feature the external adjuster that shortens the extend stroke, which is highly useful during commissioning or changeovers where the exact stroke is unknown.
Keep in mind that a plain cylinder does not hold its load on air loss; the piston drifts, and the fixed TPU bumpers only decelerate the stroke end rather than acting as a lock. For a held load, you must add an external rod lock or a pilot-operated check valve. Mounting options include LB foot, FA flange, and TC trunnion (with no SDB or back-cover available). Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors; you must select the -S variant for position sensing.
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 MFJ40X25-10 FAQ
The 40 mm bore uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. It delivers 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical max of 128.1 kgf at 1.0 MPa. The fixed TPU bumpers allow speeds of 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 10 mm on site, giving a usable extend range of 15-25 mm; it does not add stroke beyond the base and is not a mid-stroke lock. The cylinder drifts on air loss, so use an external rod lock for holding. This SKU has no -S magnet and cannot take CMSG/DMSG/EMSG sensors.
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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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