Airtac MFJ Adjustable Mini Cylinder MFJ25X100-40S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X100-40S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 100mm 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
- Stroke100 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 MFJ25X100-40S
Trimming the extend stroke by up to 40 mm on site, the AirTAC MFJ25X100-40S lets you dial in the exact end position between 60 and 100 mm without buying a new cylinder or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, giving you a body that is physically shorter than an ISO 6432 unit for the same 25 mm bore and 100 mm stroke.
Driven by filtered air through a 1/8" port, this double-acting actuator delivers 245.3 N of push force at 0.5 MPa, yielding a safe working load of about 147 N or a 12.5 kg vertical lift with a 2:1 margin. The -S suffix means a piston magnet is built in for CMSG, DMSG or EMSG switches, and fixed TPU bumper pads absorb end-of-stroke impact.
Airtac MFJ Adjustable Mini Cylinder MFJ25X100-40S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X100-40S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 100 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 MFJ25X100-40S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×100 | 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 MFJ25X100-40S Is Used
Changeover Stations
Dial in the 60-100 mm extend position on the fly for product format changes, using the 245.3 N push force to shift medium lightweight gates without swapping hardware.
Trial Fit Rigs
Use the 40 mm adjustment window to test multiple extend endpoints during prototyping, safely lifting 12.5 kg test masses vertically with a 2:1 margin.
Variable-Position Stops
Replace hard mechanical stops with the external adjuster to fine-tune the extend end, letting the fixed TPU bumpers absorb the impact for the 25 mm bore.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X100-40S the Right Cylinder?
When sizing this adjustable actuator, compare the real thrust: the MFJ20 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 trial fits and line changeovers where the final extend position is not yet finalised. If your layout demands a held load during air loss, remember this cylinder will drift—add an external rod lock or pilot check valve, as the adjuster and bumpers only decelerate, they do not lock.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover here). The -S magnet enables CMSG, DMSG and EMSG sensors for position confirmation, and the 1/8" port keeps airflow compact for the 30-800 mm/s speed range.
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 MFJ25X100-40S FAQ
This 25 mm bore cylinder uses a 1/8" port and Ø10 mm rod. At 0.5 MPa it pushes 245.3 N and pulls 206.1 N. At 0.7 MPa it pushes 343.4 N and pulls 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 40 mm on site (usable range 60-100 mm); retract remains full. The -S suffix means a piston magnet is installed for CMSG, DMSG or EMSG switches. Fixed TPU bumpers decelerate the stroke end but do not lock the load.
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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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