Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 80mm 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
- Stroke80 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75S
Trimming the extend stroke by up to 75 mm on site, this double-acting JIS-standard round-body mini cylinder removes the need to buy a new unit when the exact end position is not final. The riveted aluminium covers and SUS304 stainless barrel yield a shorter overall length than an ISO 6432 cylinder for the same 80 mm stroke, resisting mild washdown. A 1/4" port and M14x1.5 male rod thread feed the 40 mm bore, delivering 628.3 N of push force at 0.5 MPa.
Because the -S suffix includes a piston magnet, you can mount CMSG, DMSG or EMSG switches for position sensing. The fixed TPU bumper pads absorb end-of-stroke impact across the 30-800 mm/s speed range. Based on the 0.5 MPa thrust, expect a safe working load around 377 N, lifting roughly 32 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MFJ40X80-75S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MFJ40X80-75S Is Used
Changeover Stations
Dial in the extend position during product format changes using the 75 mm adjuster, avoiding the need to swap cylinders for varying part heights.
Prototype Rigs
Safely test end positions on trial assemblies with 628.3 N of push force, fine-tuning the stroke window before finalizing the machine design.
Variable Positioning Stops
Act as an adjustable end stop for medium payloads, relying on the SUS304 barrel to withstand occasional splashes in industrial environments.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75S the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need the higher 628.3 N push force at 0.5 MPa instead of the 402.2 N offered by the smaller bore. The 75 mm adjustable window is ideal for trial fits and line changeovers where the exact extend position is unknown during commissioning. Mount the cylinder using LB foot, FA flange, or TC trunnion brackets; note there is no SDB or back-cover option on this adjustable build.
Remember that the external adjuster only sets the extend end point and does not function as a mid-stroke lock. The piston will drift if air pressure is lost, so fit an external rod lock or pilot check valve to hold a suspended load safely.
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 MFJ40X80-75S FAQ
This 40 mm bore cylinder uses a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 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 without adding stroke beyond the 80 mm base. The -S suffix denotes a built-in magnet for CMSG/DMSG/EMSG sensors, while fixed TPU bumpers decelerate the stroke ends.
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