Airtac MFJ Adjustable Mini Cylinder MFJ25X250-20
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X250-20 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 250mm 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
- Stroke250 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 MFJ25X250-20
Fine-tune your extend end position on-site with the AirTAC MFJ25X250-20, a JIS-standard round-body mini cylinder built from a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the 250 mm extend stroke by up to 20 mm (yielding a 230-250 mm usable window) without buying a new unit or adding external stops. Retract remains full length.
Delivering 245.3 N push and 206.1 N pull at 0.5 MPa, this double-acting actuator provides a safe working load of roughly 147 N and lifts about 12.5 kg vertically with a 2:1 margin. The compact riveted body is shorter than an ISO 6432 cylinder for the same stroke, saving mounting length. It uses fixed TPU bumper pads for end deceleration, features a 1/8" port, and because this SKU lacks the -S magnet, it cannot accept CMSG/DMSG/EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ25X250-20 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X250-20 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 250 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 MFJ25X250-20
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×250 | 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 MFJ25X250-20 Is Used
Changeover Stations
Dial in the 230-250 mm extend position during product format changes, using the 20 mm adjuster to set stops without swapping hardware.
Trial Fit Rigs
Safely test end positions on prototypes handling up to 147 N, tweaking the extend stroke on-site until the kinematics are proven.
Variable Position Stops
Provide adjustable mechanical end limits for 12.5 kg vertical lift fixtures, relying on the SUS304 body for mild washdown resistance.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-20 the Right Cylinder?
Choose between the available bores using real 0.5 MPa push forces: the MFJ20 delivers 157 N, this MFJ25 provides 245.3 N, and the MFJ32 steps up to 402.2 N. The adjustable 20 mm window 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 or back-cover option exists).
Remember that fixed TPU bumpers only decelerate the stroke end; they do not lock the piston. If air pressure drops, the load drifts, so install an external rod lock or pilot check valve for holding. Since this specific SKU has no -S magnet, it cannot support magnetic switches.
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 MFJ25X250-20 FAQ
This double-acting cylinder has a 25 mm bore, a 10 mm rod, and a 1/8" port. 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 max of 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on-site; it does not extend beyond 250 mm or act as a mid-stroke lock. Fixed TPU bumpers decelerate the stroke end, but the piston drifts on air loss, so use an external rod lock to hold loads.
Authorized Export Seller
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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