Airtac MFJ Adjustable Mini Cylinder MFJ25X50-20S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X50-20S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 50mm 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
- Stroke50 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 MFJ25X50-20S
Fine-tune your extend end position on-site with the AirTAC MFJ25X50-20S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 20 mm, giving a usable window of 30 to 50 mm without buying a new unit or adding external stops.
Delivering 245.3 N of push force at 0.5 MPa, this double-acting 25 mm bore cylinder is both compact and capable. The riveted body is shorter than a comparable ISO 6432 cylinder, saving valuable mounting length, while the included -S piston magnet supports CMSG, DMSG, or EMSG switches. It uses a 1/8" port, a 10 mm rod, and fixed TPU bumpers to decelerate the stroke ends.
Airtac MFJ Adjustable Mini Cylinder MFJ25X50-20S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X50-20S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 50 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 MFJ25X50-20S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×50 | 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 MFJ25X50-20S Is Used
Changeover Stations
Dial in the 30 to 50 mm extend position during product changeovers, using the 245.3 N thrust to push parts into test fixtures without machining new hard stops.
Prototype Set-up Rigs
Perfect for trial assemblies where the final push distance is unknown, letting engineers shorten the stroke by up to 20 mm on-site to find the optimal operating point.
Variable-Position Stops
Act as an adjustable end stop for light materials, safely lifting around 12.5 kg vertically while benefiting from the compact JIS body length in tight machinery.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X50-20S the Right Cylinder?
When sizing these adjustable cylinders, compare the real thrust figures: the 25 mm bore here gives 245.3 N push at 0.5 MPa, whereas the MFJ20 yields 157 N and the MFJ32 jumps to 402.2 N. This makes the MFJ25 a solid middle ground for moderate loads, offering a safe working load around 147 N and a vertical lift capacity of about 12.5 kg with a 2:1 margin.
The 20 mm extend adjuster is ideal for trial fits and line changeovers where the exact end position is not yet final. Mount via LB foot, FA flange, or TC trunnion (no SDB). Remember that the bumper only decelerates the stroke; it does not lock the piston. If you need to hold a load on air loss, add an external rod lock or pilot check valve.
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 MFJ25X50-20S FAQ
This 25 mm bore double-acting cylinder uses 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. Operating pressure is 0.15-1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on-site, giving a usable 30 to 50 mm range, but it does not add stroke beyond the 50 mm base. The -S suffix means it has a built-in piston magnet for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers decelerate the stroke ends.
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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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