Airtac MFCJ Adjustable Mini Cylinder MFCJ40X50-30
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X50-30 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 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 MFCJ40X50-30
Tune both travel and end-of-stroke shock precisely with this 40 mm bore double-acting mini cylinder. An external adjuster lets you shorten the extend stroke by up to 30 mm on site, while a needle-set variable air cushion at both ends soaks up high-speed impact. The SUS304 stainless barrel and riveted aluminium covers form a JIS-standard round body that is physically shorter than an ISO 6432 cylinder for the same stroke, saving valuable mounting length.
Delivering 628.3 N push force at 0.5 MPa, it handles robust actuation with a safe working load around 377 N. It lifts about 32 kg vertically with a 2:1 safety margin. This base SKU has no magnet (-S required for CMSG/DMSG/EMSG sensors) and uses a 1/4" port. Remember the cushion only decelerates the piston; it is not a brake.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X50-30 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X50-30 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 MFCJ40X50-30
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 MFCJ40X50-30 Is Used
Press Fit Tuning
Dial in the 30 mm adjuster to find the exact seating depth for light inserts, using the 628.3 N thrust to seat parts without overshocking the tooling.
High-Speed Diverter
Absorb end-of-stroke energy from 800 mm/s actuation using the variable air cushion, preventing impact damage when routing heavy cartons.
Adjustable Sealing Head
Fine-tune the extend position on the fly for varying package heights, relying on the 377 N safe working load to apply consistent sealing pressure.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X50-30 the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need heavy thrust: the 40 mm bore pushes 628.3 N at 0.5 MPa compared to 402.2 N for the 32 mm version. This adjustable-stroke build is ideal for high-speed changeovers or shock-sensitive trial fits where you must dial in the exact 20-50 mm extend position and cushion needle simultaneously.
For mounting, select LB foot, FA flange, or TC trunnion (no SDB or back-cover here). Because this specific SKU lacks the -S magnet, it cannot accept position sensors. Finally, note that air loss causes piston drift—specify an external rod lock or pilot check valve if the load must be held.
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 MFCJ40X50-30 FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 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.
No, this specific SKU does not include a magnet, so it cannot accept CMSG, DMSG, or EMSG switches. You must order the -S variant for sensing. The external adjuster shortens the extend stroke by up to 30 mm, and the variable air cushion decelerates the piston at the ends but does not lock the load.
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