Airtac MFJ Adjustable Mini Cylinder MFJ40X250-50S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X250-50S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 250mm stroke, 1/4" 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.
- BoreØ40 mm
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- 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 MFJ40X250-50S
Trimming the extend end by up to 50 mm on site, this 40 mm bore JIS-standard round-body mini cylinder lets you finalize a 200 to 250 mm stroke without swapping hardware. The riveted aluminium covers and SUS304 stainless barrel resist mild washdown while keeping the total envelope shorter than an ISO 6432 unit of identical bore and stroke.
The Ø16 mm rod and M14x1.5 male thread deliver 628.3 N push at 0.5 MPa through a 1/4" port, yielding a safe working load near 377 N or roughly 32 kg of vertical lift with a 2:1 margin. Because the -S suffix includes a piston magnet, you can mount CMSG, DMSG or EMSG switches directly for position sensing.
Airtac MFJ Adjustable Mini Cylinder MFJ40X250-50S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X250-50S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MFJ40X250-50S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | 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 MFJ40X250-50S Is Used
Changeover Stations
Dial in the extend end within the 50 mm window during format changes, using the 628.3 N push force to shift heavy tooling carts into exact alignment.
Prototype Set-up Rigs
Fine-tune the 200 to 250 mm stroke on test benches without machining new stops, relying on the SUS304 barrel for mild corrosion resistance.
Variable-Position Stops
Adjust the end position on the fly for multi-product lines while the built-in magnet confirms travel via CMSG or DMSG sensors.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X250-50S the Right Cylinder?
When sizing this series you choose between the MFJ32 and MFJ40 bores: the 32 mm delivers 402.2 N push at 0.5 MPa, whereas this 40 mm bore reaches 628.3 N, making it the clear pick when moving heavier platens. The 50 mm adjustable window is ideal for trial fits and line changeovers where the exact end position is not yet final.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover code exists for this build). Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the rod. To hold a load on air loss, fit 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 MFJ40X250-50S FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and a Ø16 mm rod with an M14x1.5 thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm on site (usable range 200 to 250 mm) but does not lock the rod mid-stroke. The -S suffix denotes a built-in piston magnet for CMSG, DMSG or EMSG switches, and fixed TPU bumper pads decelerate the stroke ends.
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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.
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Most inquiries answered within 7-8 hours.
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