Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-50S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-50S is a genuine double acting, adjustable stroke + cushion 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 + cushion
- Rod threadM14×1.5
- CushionVariable air cushion, both ends
About the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-50S
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ40X80-50S. This double-acting JIS-standard round-body mini cylinder features a 50 mm external adjuster that shortens the extend stroke on-site, giving a usable 30-80 mm extension window. The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown, while the compact JIS body saves mounting length compared to an ISO 6432 unit of the same bore.
Fitted with a piston magnet (-S) for CMSG, DMSG, or EMSG sensors, the bore 40 design delivers 628.3 N push force at 0.5 MPa via a 1/4" port. Needle-set variable air cushions at both ends decelerate the load smoothly. For a safe working load, expect around 377 N, or roughly 32 kg of vertical lift with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-50S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-50S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MFCJ40X80-50S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 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 MFCJ Adjustable Mini Cylinder MFCJ40X80-50S Is Used
Adjustable Tooling Stands
Fine-tune the 30-80 mm extend position on the fly for variable part heights, using the 628.3 N thrust to push heavy fixtures securely into place.
High-Speed Forming Presses
Leverage the needle air cushion to absorb the 879.6 N push force at 0.7 MPa, bringing the ram to a smooth stop without end-cover shock damage.
Dynamic Product Diverters
Shift heavier loads across belts at up to 800 mm/s, adjusting the extend stroke by up to 50 mm to accommodate different package widths during changeovers.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-50S the Right Cylinder?
When sizing this adjustable-stroke family, compare the real thrust: the 40 mm bore provides 628.3 N push at 0.5 MPa, whereas the smaller MFCJ32 offers 402.2 N. Choose the 40 mm bore when moving heavier fixtures at high speed, relying on the variable air cushion to soak up end-of-stroke kinetic energy. The 50 mm adjuster window is perfect for trial fits and changeovers where the exact extend point must be tuned on the machine.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover). Because the -S magnet is present, you can directly mount reed or electronic switches. Remember that the cushion only decelerates the load; it does not function as a brake. If you need to hold a vertical load during 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 MFCJ Adjustable Mini Cylinder MFCJ40X80-50S FAQ
This 40 mm bore 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, 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 50 mm (usable 30-80 mm), while the needle variable air cushion at both ends decelerates the piston near the ends for smooth high-speed operation. The cushion is not a lock or brake; the cylinder cannot hold position on air loss, so use an external rod lock for suspended loads.
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