Airtac MFJ Adjustable Mini Cylinder MFJ40X225-40S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X225-40S 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 MFJ40X225-40S
Trimming the extend stroke by up to 40 mm on site, the MFJ40X225-40S lets you dial in the exact end position between 185 mm and 225 mm without buying a new cylinder or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless steel barrel and riveted aluminium covers, yielding a shorter overall length than an ISO 6432 unit for the same 40 mm bore and 225 mm stroke. The riveted rolling-packed construction resists mild corrosion and washdown environments.
Driven by a 16 mm piston rod and a 1/4" port, this double-acting actuator delivers 628.3 N of push force at 0.5 MPa. For vertical lifting tasks, it handles about 32 kg safely with a 2:1 margin, while the built-in magnet (-S) supports CMSG, DMSG, and EMSG switches for position sensing. Fixed TPU bumper pads absorb impact at the stroke ends across a 30-800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ40X225-40S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X225-40S |
|---|---|
| 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 MFJ40X225-40S
| 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 MFJ40X225-40S Is Used
Changeover Stations
Fine-tune the 225 mm extend down by 40 mm during product line changeovers, using the 628.3 N push force to shift heavy tooling without swapping cylinders.
Trial Fit Rigs
Dial in the exact end position on prototype assembly rigs where the final travel distance is unknown, relying on the SUS304 body for washdown resistance.
Variable Position Stops
Adjust the stroke externally to set precise variable stops for machining fixtures, taking advantage of the 32 kg vertical lift capacity at 0.5 MPa.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X225-40S the Right Cylinder?
When sizing these adjustable cylinders, compare the two available bores directly: the MFJ40 pushes with 628.3 N at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N. Choose the 40 mm bore if your trial fits or line changeovers involve moving heavier jigs, and use the external adjuster to fine-tune the extend end by up to 40 mm when the exact travel is not yet final. Both options use a 1/4" port.
Mount this actuator using LB foot, FA flange, or TC trunnion brackets, as there is no SDB or back-cover option on this build. The -S magnet enables CMSG, DMSG, or EMSG sensors for confirmation. Remember that the adjuster only sets the end position; it is not a mid-stroke lock, and the cylinder will drift on air loss—add an external rod lock or pilot check valve if you need to hold a suspended load.
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 MFJ40X225-40S 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, 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.
An external adjuster shortens the extend stroke by up to 40 mm on site, giving a usable range of 185-225 mm, while the retract remains full. It uses fixed TPU bumper pads to decelerate at the ends, not an adjustable air cushion. The -S suffix means it has a built-in magnet for CMSG, DMSG, or EMSG switches.
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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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