Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30S 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 MFJ25X250-30S
Dial in your end position on the fly with the AirTAC MFJ25X250-30S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 30 mm on site, giving a usable extend range of 220-250 mm without buying a new unit or adding external stops. The -S suffix equips the piston with a magnet for CMSG, DMSG, or EMSG switches.
This double-acting actuator runs on a 1/8" port with a Ø10 mm rod (M10x1.25 male thread), generating 245.3 N of push force at 0.5 MPa. For sizing context, it sits between the MFJ20 at 157 N and the MFJ32 at 402.2 N. Based on its 0.5 MPa push rating, it handles a safe working load of about 147 N, lifting roughly 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.
Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30S |
|---|---|
| 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 MFJ25X250-30S
| 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 MFJ25X250-30S Is Used
Changeover Stations
Fine-tune the 220-250 mm extend position during product format changes, using the 30 mm adjuster to hit new stops without swapping the cylinder.
Trial Fit Rigs
Safely test end positions on prototypes with 245.3 N of push force, dialing back the stroke in the field until the exact kinematic point is proven.
Variable Position Stops
Adjust the extend end by up to 30 mm to accommodate varying part widths, using the compact JIS body to save space in tight tooling layouts.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30S the Right Cylinder?
Choose the MFJ25 when you need mid-range thrust: it delivers 245.3 N push at 0.5 MPa, bridging the gap between the lighter MFJ20 (157 N) and the heavier MFJ32 (402.2 N). The 30 mm adjustable window is ideal for trial fits and line changeovers where the exact extend position is not final, letting you fine-tune the 220-250 mm travel during commissioning. Mounting options include LB foot, FA flange, and TC trunnion (no SDB).
Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the load. If air pressure drops, the piston will drift, so install an external rod lock or pilot check valve for suspended loads. This -S model supports CMSG/DMSG/EMSG sensors out of the box.
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 MFJ25X250-30S FAQ
This double-acting cylinder has a 1/8" port and generates 245.3 N push / 206.1 N pull at 0.5 MPa, and 343.4 N push / 288.5 N pull at 0.7 MPa. The theoretical maximum force is 50 kgf at 1.0 MPa. It operates at 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 30 mm on site (usable range 220-250 mm); it sets the end position but is not a mid-stroke lock. End-of-travel deceleration is handled by fixed TPU bumper pads, not an adjustable air cushion. The built-in -S magnet allows CMSG, DMSG, and EMSG sensors to be fitted.
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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