Airtac MFJ Adjustable Mini Cylinder MFJ25X80-20
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X80-20 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 80mm 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
- Stroke80 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 MFJ25X80-20
Trimming the extend position by up to 20 mm on site, this double-acting JIS-standard round-body mini cylinder saves you from buying a new unit when the exact end point is not final. The external adjuster lets you dial in the stroke from 60 to 80 mm during commissioning, while the SUS304 stainless barrel and riveted aluminium covers resist mild washdown. Equipped with a 1/8" port and a 10 mm rod, it delivers 245.3 N of push force at 0.5 MPa.
For a 25 mm bore, this translates to a safe working load of roughly 147 N, or lifting about 12.5 kg vertically with a 2:1 safety margin. The body is purposefully shorter than an ISO 6432 cylinder of the same bore and stroke, saving valuable mounting length. It relies on fixed TPU bumper pads to decelerate the stroke end, and because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ25X80-20 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X80-20 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 80 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 MFJ25X80-20
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×80 | 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 MFJ25X80-20 Is Used
Changeover Stations
Dial in the 60 to 80 mm extend position on the fly when switching product families, avoiding the need to swap out the entire cylinder for a different stroke length.
Trial Fit Rigs
Use the 20 mm adjustment window to find the optimal push distance for a 12.5 kg vertical lift prototype before finalizing the mechanical hard stops.
Variable Position Stops
Act as a dynamic end-stop for light press operations, leveraging the 245.3 N push force at 0.5 MPa while fine-tuning the contact point on site.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X80-20 the Right Cylinder?
When sizing this series, compare the real thrust figures: the MFJ20 bore provides 157 N of push 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 positioning. The 20 mm adjustable window is specifically useful for changeover stations where the exact extend distance varies between product runs.
Mounting options include LB foot, FA flange, and TC trunnion (there is no SDB or back-cover option on this build). Remember that the adjuster sets the end position but does not lock the piston mid-stroke; if air pressure drops, the cylinder drifts. For a safety-held load, install an external rod lock or pilot-operated check valve. If you need position sensing, select the -S magnet variant to enable switch mounting.
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 MFJ25X80-20 FAQ
This 25 mm bore cylinder features a 1/8" port and a 10 mm rod. It generates 245.3 N push and 206.1 N pull at 0.5 MPa, 343.4 N push and 288.5 N pull at 0.7 MPa, with a theoretical maximum of 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on site, giving a usable extend range of 60 to 80 mm. Fixed TPU bumpers decelerate the stroke end, but they do not act as a lock; the piston will drift on air loss, so use an external rod lock for holding.
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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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Most inquiries answered within 7-8 hours.
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