Airtac MFJ Adjustable Mini Cylinder MFJ25X40-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X40-30S 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 MFJ25X40-30S
Trimming the extend stroke by up to 30 mm on-site, the AirTAC MFJ25X40-30S lets you dial in the final end position without buying a new cylinder or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, delivering a shorter overall mounting length than an equivalent ISO 6432 unit while never actually conforming to that standard.
Driven by a Ø10 mm piston rod with a 1/8" port, the 25 mm bore generates 245.3 N of push force at 0.5 MPa. The built-in magnet (-S) supports CMSG, DMSG and EMSG switches for position sensing. Based on the 0.5 MPa thrust, this unit handles a safe working load of roughly 147 N, lifting about 12.5 kg vertically with a 2:1 safety margin.
Airtac MFJ Adjustable Mini Cylinder MFJ25X40-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X40-30S |
|---|---|
| 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 MFJ25X40-30S
| 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 MFJ25X40-30S Is Used
Changeover Stations
Fine-tune the 10 to 40 mm extend position during product changeovers to accommodate different part heights without swapping hardware.
Trial Fit Rigs
Dial in the exact extend stop on prototype jigs where the final push distance is unknown, relying on the 245.3 N thrust to seat components.
Variable Position Stops
Adjust the end point on the fly for light pressing tasks, using the fixed TPU bumpers to absorb the impact at the newly set stroke end.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X40-30S the Right Cylinder?
When sizing this adjustable-stroke family, compare the real thrust: the MFJ20 yields 157 N at 0.5 MPa, this MFJ25 provides 245.3 N, and the larger MFJ32 outputs 402.2 N. The external adjuster is ideal for trial fits and line changeovers where the exact 10 to 40 mm extend position is not final, while the retract stroke remains full.
Mounting options include LB foot, FA flange and TC trunnion (with no SDB or back-cover available). Note that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the piston. If you need to hold a load 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 MFJ25X40-30S FAQ
This 25 mm bore cylinder uses a 1/8" port and a Ø10 mm rod. 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.
The external adjuster shortens the extend stroke by up to 30 mm on-site; it sets the end position but is not a mid-stroke lock. The -S suffix means it has a built-in magnet for CMSG, DMSG or EMSG sensors, and it uses fixed TPU bumpers rather than 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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