Airtac MFJ Adjustable Mini Cylinder MFJ25X120-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X120-30S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 120mm 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
- Stroke120 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 MFJ25X120-30S
Trimming the extend stroke by up to 30 mm on site, the AirTAC MFJ25X120-30S lets you set a precise 90 to 120 mm end position without swapping hardware. This JIS-standard round-body mini cylinder features a SUS304 stainless steel barrel and riveted aluminium covers, yielding a shorter overall body than an ISO 6432 unit for the same 25 mm bore and 120 mm stroke.
Driven by a 10 mm rod with an M10x1.25 male thread and 1/8" port, it delivers 245.3 N push force at 0.5 MPa. The integrated -S magnet supports CMSG, DMSG, or EMSG switches for position sensing. Fixed TPU bumper pads absorb end-of-stroke impact, and the design yields a safe working load around 147 N, lifting about 12.5 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ25X120-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X120-30S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 120 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 MFJ25X120-30S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×120 | 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 MFJ25X120-30S Is Used
Changeover Stations
Dial in the 90-120 mm extend position during product format changes without machining new hard stops.
Trial Fit Rigs
Perfect for prototype assemblies where the exact push distance is unknown, using the 30 mm adjuster to find the sweet spot.
Variable Position Stops
Handle 12.5 kg vertical lifts at 0.5 MPa while fine-tuning the end point for delicate seating or clamping tasks.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X120-30S the Right Cylinder?
Selecting between the available bores means matching your force needs: the 20 mm version outputs 157 N, this 25 mm bore provides 245.3 N, and the 32 mm bore jumps to 402.2 N at 0.5 MPa. The adjustable stroke excels during trial fits and line changeovers where the exact extend position is unknown, saving you from buying multiple cylinders.
Mount this unit via LB foot, FA flange, or TC trunnion brackets (SDB is unavailable). Because the piston drifts on air loss, add an external rod lock or pilot check valve to hold suspended loads. The -S magnet enables electronic or reed sensors, whereas a plain SKU cannot take a switch.
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 MFJ25X120-30S FAQ
This 25 mm bore cylinder uses 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 maximum of 50 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 30 mm on site, giving a usable 90-120 mm window. Fixed TPU bumpers decelerate the stroke end but do not lock the piston; the cylinder 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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