Airtac MFJ Adjustable Mini Cylinder MFJ40X75-40S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X75-40S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-40S
Trim the extend stroke by up to 40 mm right at the fixture with the AirTAC MFJ40X75-40S, a JIS-standard round-body mini cylinder built for on-site adjustability. The external adjuster lets you dial in the end position from 35 to 75 mm without swapping hardware or adding external stops, making it highly effective for trial fits and line changeovers. Driven by a 1/4" port and a 16 mm rod, this double-acting actuator delivers 628.3 N of push force at 0.5 MPa.
The SUS304 stainless barrel shrinks mounting length compared to an ISO 6432 unit while resisting mild washdown corrosion. Equipped with a piston magnet (-S), it supports CMSG, DMSG, and EMSG switches for position sensing. Based on the 0.5 MPa thrust, it handles a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin. Fixed TPU bumpers absorb end-of-stroke impact across the 30-800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ40X75-40S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X75-40S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 MFJ40X75-40S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 MFJ40X75-40S Is Used
Changeover Stations
Dial in the 40 mm extend window during format changes to set new pusher endpoints without machining new hard stops or changing the cylinder.
Trial Fit Rigs
Leverage the 628.3 N push force to seat components while slowly extending the stroke to find the exact 35 to 75 mm contact position.
Variable Position Stops
Use the magnet for CMSG sensor feedback and adjust the external rod to alter the stroke endpoint for different product heights on the same line.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X75-40S the Right Cylinder?
When sizing these adjustable cylinders, compare the bores directly: this MFJ40 delivers 628.3 N of push at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N. Choose the 40 mm bore when moving heavier jigs or overcoming significant friction. The 40 mm adjustment window is invaluable when the exact extend position is unknown during commissioning, allowing you to fine-tune the stroke safely. Mount via LB foot, FA flange, or TC trunnion (SDB and back-cover options are not available). Remember that the bumper only decelerates the stroke; it does not lock the load. If you need to hold a vertical load on air loss, install 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 MFJ40X75-40S FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod. 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.
The external adjuster shortens the extend stroke by up to 40 mm on-site, giving a usable extend range of 35-75 mm; retract remains full. The -S suffix denotes a built-in piston magnet for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers absorb end impact.
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