Airtac MFJ Adjustable Mini Cylinder MFJ40X225-75S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X225-75S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 225mm 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
- Stroke225 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 MFJ40X225-75S
Trim the extend end of your stroke by up to 75 mm on site with the AirTAC MFJ40X225-75S, a JIS-standard round-body mini cylinder built for double-acting service. The external adjuster lets you dial in the exact end position between 150 and 225 mm during line commissioning, removing the need to swap hardware when the target position is not yet final. A 1/4" port feeds the 40 mm bore, yielding a robust 628.3 N of push force at 0.5 MPa.
The riveted rolling-packed construction pairs a SUS304 stainless steel barrel with aluminium covers, delivering mild washdown resistance while keeping the total envelope shorter than a comparable ISO 6432 unit. Because this SKU carries the -S suffix, a built-in piston magnet is present, allowing you to bolt on CMSG, DMSG or EMSG switches for precise end-of-stroke detection. Fixed TPU bumper pads absorb impact energy at the stroke extremes.
Airtac MFJ Adjustable Mini Cylinder MFJ40X225-75S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X225-75S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 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 MFJ40X225-75S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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 MFJ40X225-75S Is Used
Changeover Station Dials
Fine-tune the extend position up to 75 mm during product family changeovers, using the 628.3 N push force to shift heavy tooling plates without adding external mechanical stops.
Trial-Fit Assembly Rigs
Dial in the exact 150 to 225 mm extend length on prototype assembly rigs where the final end position is unknown, leveraging the 32 kg vertical lift capacity for component placement.
Variable-Position Stops
Serve as an adjustable end-stop in automated machining cells, shortening the extend stroke on the fly while the built-in magnet confirms the retracted position via a DMSG sensor.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X225-75S the Right Cylinder?
When sizing these adjustable-stroke units, compare the two available bores directly: the 40 mm bore chosen here delivers 628.3 N of push force at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N under the same pressure. For this 40 mm bore, a practical safe working load is roughly 377 N, which translates to lifting about 32 kg vertically with a 2:1 safety margin. Choose the 40 mm bore when your trial-fit rigs or changeover stations need that extra thrust to overcome friction or move heavier fixtures.
Mounting options include LB foot, FA flange and TC trunnion brackets, with no SDB or back-cover provision on this adjustable build. Remember that the external adjuster only shortens the extend stroke; it does not function as a mid-stroke lock, and the cylinder will drift if air pressure is lost. For applications requiring a held load, you must add an external rod lock or pilot-operated 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 MFJ40X225-75S FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 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 75 mm on site, giving a usable extend range of 150 to 225 mm. It only sets the end position and does not act as a lock; the cylinder drifts on air loss. Fixed TPU bumper pads decelerate the stroke end, and the -S magnet enables CMSG or EMSG 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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