Airtac MFJ Adjustable Mini Cylinder MFJ25X30-20S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X30-20S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 30mm 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
- Stroke30 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 MFJ25X30-20S
Trimming the extend stroke by up to 20 mm on site, this double-acting JIS-standard round-body mini cylinder saves you from buying new parts for trial fits. The SUS304 stainless barrel and riveted aluminium covers form a compact body that is physically shorter than a comparable ISO 6432 unit, while the built-in magnet (-S) supports CMSG, DMSG, or EMSG switches.
Fitted with a 10 mm rod and 1/8" port, the 25 mm bore generates 245.3 N of push force at 0.5 MPa, yielding a safe working load of about 147 N. It lifts roughly 12.5 kg vertically with a 2:1 margin, and fixed TPU bumpers absorb the end-of-stroke impact.
Airtac MFJ Adjustable Mini Cylinder MFJ25X30-20S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X30-20S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 30 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 MFJ25X30-20S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×30 | 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 MFJ25X30-20S Is Used
Changeover Stations
Dial in the 10 to 30 mm extend position during format changes without swapping cylinders, using the 245.3 N push force to shift light tooling.
Trial Fit Rigs
Perfect for prototyping where the final stroke is unconfirmed, letting you shorten the extend end by up to 20 mm and test safely.
Variable Position Stops
Use the adjuster to set precise end stops for 25 mm bore tasks, lifting around 12.5 kg vertically while relying on fixed TPU bumpers for impact absorption.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X30-20S the Right Cylinder?
When sizing this series, compare the real outputs: the MFJ20 delivers 157 N of push force at 0.5 MPa, this MFJ25 provides 245.3 N, and the larger MFJ32 hits 402.2 N. The external adjuster is ideal for changeover stations where the exact end position is unknown until commissioning. Mount via LB foot, FA flange, or TC trunnion (no SDB or back cover exists on this build). Remember that the bumper decelerates the stroke but does not act as a lock; if you need to hold a load on air loss, install 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 MFJ25X30-20S 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 (usable extend 10-30 mm) without adding stroke beyond the base. The -S suffix means a piston magnet is built in for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers decelerate the stroke end, but note this is not an adjustable air cushion.
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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.
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Most inquiries answered within 7-8 hours.
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