Airtac MFJ Adjustable Mini Cylinder MFJ40X125-10
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X125-10 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 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 MFJ40X125-10
Dial in your extend end position on the fly with the AirTAC MFJ40X125-10, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 10 mm on site, giving a usable extend range of 115 to 125 mm without buying a new cylinder or adding external stops. The riveted construction is shorter than an ISO 6432 cylinder for the same 40 mm bore and 125 mm stroke, saving valuable mounting length while the stainless barrel resists mild corrosion and washdown.
This double-acting actuator delivers 628.3 N of push force and 527.8 N of pull force at 0.5 MPa, peaking at a theoretical 128.1 kgf at 1.0 MPa. For practical sizing, its safe working load is roughly 377 N, meaning it can lift about 32 kg vertically with a 2:1 safety margin. It uses a 1/4" port, a 16 mm piston rod with an M14x1.5 male thread, and fixed TPU bumper pads to decelerate the stroke end. Note this SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ40X125-10 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X125-10 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MFJ40X125-10
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MFJ40X125-10 Is Used
Changeover Stations
Fine-tune the extend stroke by up to 10 mm during product changeovers to position a 32 kg push load accurately without machining new hard stops.
Trial Fit Rigs
Validate a 115 to 125 mm extend motion on a prototype fixture, leveraging the 628.3 N force to press parts while dialing in the exact end position.
Variable-Position Stops
Adjust the end-of-stroke contact point on site for a 40 mm bore assembly station, using the riveted stainless body to withstand mild washdown.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X125-10 the Right Cylinder?
When choosing between the two available bores, the MFJ40 provides 628.3 N of push at 0.5 MPa, while the smaller MFJ32 offers 402.2 N. Pick this 40 mm bore when your trial fit or line changeover requires moving heavier fixtures within that 10 mm adjustment window. The external adjuster is ideal for commissioning stages where the exact end position is not yet final, letting you fine-tune the extend stroke without swapping hardware.
Remember that the fixed TPU bumpers only decelerate the stroke end; they do not lock the piston. If air pressure drops, the cylinder drifts and cannot hold a load, so install an external rod lock or pilot-operated check valve for vertical loads. Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover mount). Because this specific SKU has no -S magnet, it cannot support magnetic switches.
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 MFJ40X125-10 FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 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, and operating speed ranges from 30 to 800 mm/s.
An external adjuster shortens the extend stroke by up to 10 mm on site, giving a usable range of 115 to 125 mm. It only sets the end position and does not act as a mid-stroke lock. Fixed TPU bumper pads decelerate the stroke end, but the cylinder drifts on air loss, so use an external rod lock for holding. This SKU also lacks a magnet, so it cannot take sensors.
Authorized Export Seller
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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