Airtac MFJ Adjustable Mini Cylinder MFJ40X250-10
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X250-10 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 MFJ40X250-10
Trimming the extend end by up to 10 mm on site, the AirTAC MFJ40X250-10 lets you dial in a 240 to 250 mm forward stroke without buying a new unit or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, delivering a shorter overall length than an ISO 6432 cylinder for the same 40 mm bore and 250 mm stroke.
Driven by a 16 mm rod through a 1/4 inch port, this double-acting actuator pushes with 628.3 N at 0.5 MPa. That translates to a safe working load of about 377 N, or roughly 32 kg of vertical lift with a 2:1 margin. Fixed TPU bumper pads absorb end impacts, and because this SKU lacks the -S magnet, it cannot accept CMSG, DMSG or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ40X250-10 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X250-10 |
|---|---|
| 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 MFJ40X250-10
| 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 MFJ40X250-10 Is Used
Changeover Calibration
Dial in the 240 to 250 mm extend position during format changeovers, using the 10 mm adjuster to match new stop distances without machining new brackets.
Trial Fit Assembly
Leverage the 628.3 N push force to seat components while fine-tuning the exact forward position on prototype rigs before finalising the stroke length.
Variable Position Testing
Safely press test samples with a 377 N working load, making minute 1 mm adjustments to the extend end to find the optimal contact point.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X250-10 the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need the higher force class: the 40 mm bore delivers 628.3 N push at 0.5 MPa versus 402.2 N for the 32 mm option. The 10 mm adjustable window is ideal for trial fits and line changeovers where the exact end position is not yet final, saving you from swapping hardware for every minor tweak.
Mount this actuator using LB foot, FA flange or TC trunnion brackets, as there is no SDB or back-cover option. Remember that the external adjuster and fixed bumpers only decelerate the stroke; they do not lock the rod. If the load must be held 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 MFJ40X250-10 FAQ
This 40 mm bore double-acting cylinder has a 1/4 inch port and an M14x1.5 male rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 10 mm, giving a usable 240 to 250 mm forward range while retract remains full. Fixed TPU bumper pads decelerate the end of travel but do not act as a brake; the piston drifts on air loss, so use an external rod lock for holding. This SKU has no -S magnet and cannot take sensors.
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1-Year Warranty
Covers non-human-caused product damage.
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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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