Airtac MFCJ Adjustable Mini Cylinder MFCJ40X75-50S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X75-50S is a genuine double acting, adjustable stroke + cushion 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 + cushion
- Rod threadM14×1.5
- CushionVariable air cushion, both ends
About the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X75-50S
With a 50 mm on-site stroke adjustment window, the MFCJ40X75-50S lets you fine-tune the extend end from 25 to 75 mm without dismantling - ideal for changeovers where the exact position is still being dialed in. The needle-set variable air cushion at both ends absorbs high-speed shock, keeping cycle times up while protecting tooling and workpieces.
This 40 mm bore unit delivers 628.3 N push and 527.8 N pull at 0.5 MPa, rising to 879.6 N push at 0.7 MPa. Its SUS304 stainless barrel and riveted aluminium covers form a compact JIS-standard round body that is shorter than an ISO 6432 cylinder for the same bore and stroke. The built-in magnet (-S) enables CMSG, DMSG, or EMSG position sensing, and the 1/4" port keeps plumbing simple.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X75-50S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X75-50S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| 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 | Variable air cushion, both ends |
| 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 MFCJ Adjustable Mini Cylinder MFCJ40X75-50S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 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 MFCJ Adjustable Mini Cylinder MFCJ40X75-50S Is Used
Fixture Position Tuning
Adjust the extend stop by up to 50 mm on-site to fine-tune workpiece clamping positions during machine setup, using the 628.3 N push force at 0.5 MPa to secure parts firmly.
High-Speed Sorting
Run at speeds up to 800 mm/s while the variable air cushion at both ends absorbs end-of-stroke impact, protecting lightweight sorted components from damage.
Quick Changeover Stops
Shorten the extend stroke by up to 50 mm when switching product sizes on packaging lines, with the 527.8 N retract force pulling the mechanism back quickly.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X75-50S the Right Cylinder?
Compare the 40 mm bore against the 32 mm option: MFCJ40 delivers 628.3 N push at 0.5 MPa versus 402.2 N for MFCJ32 - a 56% force increase for heavier fixtures or larger workpieces. Choose the adjustable-stroke + cushion combination when you need to tune end positions during high-speed trial runs or absorb shock on fast-moving loads. Remember: this cylinder does not hold position on air loss; for a held load, add an external rod lock or pilot check valve. Mount with LB foot, FA flange, or TC trunnion brackets, and pair the -S magnet with CMSG, DMSG, or EMSG switches for reliable sensing.
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 MFCJ Adjustable Mini Cylinder MFCJ40X75-50S FAQ
At 0.5 MPa, push force is 628.3 N and pull is 527.8 N. At 0.7 MPa, push rises to 879.6 N and pull to 738.9 N. Theoretical maximum is 128.1 kgf at 1.0 MPa. The 40 mm bore uses a 16 mm rod with M14x1.5 thread and 1/4" port.
The external adjuster shortens the extend end by up to 50 mm, giving a usable extend range of 25-75 mm while retract stays full. The -S magnet enables CMSG, DMSG, or EMSG sensors for position detection. The variable air cushion at both ends decelerates the piston near stroke end - it does not lock or hold the load.
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