Airtac MFJ Adjustable Mini Cylinder MFJ40X225-30
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X225-30 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 MFJ40X225-30
Tune your extend end-position on site with the AirTAC MFJ40X225-30, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the forward stroke by up to 30 mm, giving a usable extend range of 195 to 225 mm without buying a new unit. This 40 mm bore delivers 628.3 N of push force at 0.5 MPa, making it a robust choice for mid-weight tasks.
This double-acting actuator runs on a 1/4" port with a 16 mm rod and hits a theoretical maximum of 128.1 kgf at 1.0 MPa. Its compact riveted body is shorter than an ISO 6432 cylinder for the same stroke, saving valuable machine space. The fixed TPU bumper pads decelerate the stroke end, and this specific SKU lacks a magnet, so it cannot accept CMSG or DMSG switches without changing to an -S variant.
Airtac MFJ Adjustable Mini Cylinder MFJ40X225-30 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X225-30 |
|---|---|
| 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 MFJ40X225-30
| 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 MFJ40X225-30 Is Used
Changeover Stations
Dial in the 195 to 225 mm extend position during product format changes, using the 30 mm adjuster to set stops for varying part sizes without swapping hardware.
Assembly Trial Rigs
Leverage the 628.3 N push force to seat components, fine-tuning the end point on the fly to prevent over-travel while validating a new assembly process.
Variable Position Stops
Set precise extend limits for testing sensors or probes, relying on the fixed TPU bumpers to absorb the impact at the adjusted 195 mm minimum forward position.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X225-30 the Right Cylinder?
When sizing these actuators, compare the real thrust: this 40 mm bore pushes 628.3 N and pulls 527.8 N at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N of push force. Choose the 40 mm when moving heavier platens or overcoming significant friction. The 30 mm adjustable window is highly useful during line changeovers or trial fits where the exact end position is not yet finalised.
Remember that the external adjuster only sets the extend endpoint; it does not lock the piston mid-stroke. If air pressure drops, the rod will drift, so install an external rod lock or pilot check valve to hold a suspended load. Mount using LB foot, FA flange, or TC trunnion brackets, as there is no SDB or back-cover option on this build.
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 MFJ40X225-30 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 30 mm on site, giving a usable forward range of 195 to 225 mm. The retract stroke remains full. It relies on fixed TPU bumper pads for end deceleration, not an adjustable air cushion. Because this SKU lacks an -S magnet, it cannot take position sensors, and it will not hold a load on air loss without an external rod lock.
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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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