Airtac MFJ Adjustable Mini Cylinder MFJ25X125-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X125-30S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 125mm 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
- Stroke125 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 MFJ25X125-30S
Tune your extend end-position on the fly with the AirTAC MFJ25X125-30S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the forward stroke by up to 30 mm directly on-site, yielding a usable extend range of 95-125 mm without buying a new unit. The retract stroke remains full length.
Delivering 245.3 N of push force at 0.5 MPa, this double-acting actuator is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length. The -S suffix adds a piston magnet for CMSG, DMSG, or EMSG switches. It uses a 1/8" port and fixed TPU bumper pads. With a safe working load around 147 N, it lifts about 12.5 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ25X125-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X125-30S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 125 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 MFJ25X125-30S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×125 | 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 MFJ25X125-30S Is Used
Changeover Stations
Fine-tune the 95-125 mm extend position during product format changes, using the external adjuster to set new stops without swapping hardware.
Trial Fit Rigs
Dial in the exact extend distance on prototype jigs, relying on the 245.3 N push force to seat parts while finding the optimal stroke.
Variable Position Stops
Act as an adjustable end-stop in light assembly machines, lifting about 12.5 kg vertically and shortening the stroke up to 30 mm as needed.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X125-30S the Right Cylinder?
Choose between the available bores by comparing the 0.5 MPa push forces: the MFJ20 provides 157 N, this MFJ25 hits 245.3 N, and the MFJ32 offers 402.2 N. This 25 mm bore is the right middle ground when you need roughly 15 kg of theoretical push force but want to avoid the bulk of a 32 mm body.
The 30 mm adjustable window is perfect for trial fits and line changeovers where the exact end position is not final. Note that the bumper pads only decelerate the stroke end; the piston drifts on air loss, so fit an external rod lock or pilot check valve to hold a load. Mount via LB foot, FA flange, or TC trunnion (no SDB). The included -S magnet supports position sensing.
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 MFJ25X125-30S FAQ
This 25 mm bore cylinder features a 1/8" port and a 10 mm rod with an M10x1.25 male thread. It delivers 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 30 mm (usable range 95-125 mm); it does not add stroke or lock mid-travel. Fixed TPU bumpers decelerate the ends. The -S suffix means a magnet is built-in for CMSG, DMSG, or EMSG switches.
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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