Airtac MFJ Adjustable Mini Cylinder MFJ25X45-40S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X45-40S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 45mm 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
- Stroke45 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 MFJ25X45-40S
Fine-tune your extend end position on-site with the AirTAC MFJ25X45-40S, a JIS-standard round-body mini cylinder built from a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 40 mm, giving a usable 5 to 45 mm window without buying a new unit or adding external stops. This riveted construction is notably shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length while resisting mild washdown.
Delivering 245.3 N push and 206.1 N pull at 0.5 MPa, this double-acting actuator carries a safe working load of about 147 N. It lifts roughly 12.5 kg vertically with a 2:1 margin. The -S suffix equips the piston with a magnet for CMSG, DMSG or EMSG switches. The 1/8" port and fixed TPU bumper pads handle standard deceleration, as the cylinder does not lock the load on air loss.
Airtac MFJ Adjustable Mini Cylinder MFJ25X45-40S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X45-40S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 45 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 MFJ25X45-40S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×45 | 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 MFJ25X45-40S Is Used
Changeover Stations
Dial in the extend stroke by up to 40 mm during product changeovers to set new end positions without swapping the cylinder or adding mechanical stops.
Trial Fit Rigs
Use the 5 to 45 mm adjustable window to safely test end positions for a 12.5 kg vertical lift before finalising the machine design.
Variable Position Stops
Rely on the 245.3 N push force to move light parts while tweaking the external adjuster to fine-tune the stopping point on the fly.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X45-40S the Right Cylinder?
When sizing this series, compare the real thrust: the MFJ20 provides 157 N at 0.5 MPa, this MFJ25 hits 245.3 N, and the larger MFJ32 delivers 402.2 N. Choose the 25 mm bore when your load sits in that middle band. The 40 mm adjustable window is ideal for trial fits and line changeovers where the exact end position is not finalised.
Remember that the external adjuster only sets the extend end point; it is not a mid-stroke lock. Because the piston drifts on air loss, install an external rod lock or pilot check valve for held loads. Mounting options include LB foot, FA flange and TC trunnion (no SDB), and the built-in magnet supports CMSG, DMSG and EMSG sensors.
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 MFJ25X45-40S FAQ
This double-acting cylinder has a 1/8" port and a 10 mm rod with an M10x1.25 male thread. 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. Operating pressure is 0.15-1.0 MPa.
The external adjuster shortens the extend stroke by up to 40 mm, yielding a 5 to 45 mm usable window; retract remains full. The -S suffix means it has a built-in magnet for CMSG, DMSG or EMSG switches. Fixed TPU bumpers decelerate the stroke end, but this is not an adjustable air cushion.
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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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