Airtac MFJ Adjustable Mini Cylinder MFJ25X40-40
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X40-40 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 40mm 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
- Stroke40 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 MFJ25X40-40
Trimming the extend stroke by up to 40 mm on site, the AirTAC MFJ25X40-40 lets you dial in the exact end position without buying a new cylinder or adding external stops. This double-acting, JIS-standard round-body mini cylinder features a SUS304 stainless steel barrel and riveted aluminium covers, giving you a mounting envelope that is notably shorter than an equivalent ISO 6432 unit.
At 0.5 MPa it delivers 245.3 N of push force and 206.1 N of pull, operating through a 1/8" port at speeds from 30 to 800 mm/s. For practical sizing, this translates to a safe working load of roughly 147 N, or lifting about 12.5 kg vertically with a 2:1 safety margin. Note that this specific SKU lacks a magnet, so it cannot accept CMSG, DMSG, or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ25X40-40 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X40-40 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 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 MFJ25X40-40
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MFJ25X40-40 Is Used
Changeover Stations
Fine-tune the extend end by up to 40 mm during product format changes, using the 245.3 N push force to position light fixtures without swapping cylinders.
Trial Fit Rigs
Dial in the exact stopping point on prototype assemblies where the final dimension is unknown, relying on the 1/8" port and compact JIS body to save space.
Variable-Position Stops
Act as an adjustable mechanical stop for light pressing tasks, safely handling around 147 N of working load while the fixed TPU bumpers absorb end impacts.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X40-40 the Right Cylinder?
When choosing between the available bores, this 25 mm version sits right in the middle: it nearly doubles the thrust of the MFJ20 (157 N push @0.5 MPa) while being much lighter than the MFJ32 (402.2 N push @0.5 MPa). The 40 mm adjustable window is especially useful for trial fits and line changeovers where the final extend position is not yet locked down.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover mount). Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not hold the load. If you need to prevent drift on air loss, install an external rod lock or pilot check valve.
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 MFJ25X40-40 FAQ
This double-acting cylinder uses 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 maximum of 50 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 40 mm on site without changing the full retract distance. The cylinder uses fixed TPU bumper pads to decelerate at the ends, not an adjustable air cushion. Also, because this SKU lacks the -S magnet, it cannot support CMSG, DMSG, or EMSG sensors.
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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