Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- CushionVariable air cushion, both ends
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50S
Dial in exact end positions and absorb high-speed shock with the AirTAC MFCJ40X300-50S. This double-acting JIS-standard round-body mini cylinder features a 50mm external adjuster to shorten the extend stroke on-site, while needle variable air cushions at both ends soak up end-of-stroke impact. The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown environments.
Delivering 628.3N push force at 0.5MPa via a 1/4" port, this 40mm bore unit is built for rigorous cycling. The -S suffix means a piston magnet is included for CMSG, DMSG, or EMSG sensors. For the same bore and stroke, this compact JIS body is shorter than an ISO 6432 cylinder, saving valuable mounting length.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MFCJ40X300-50S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MFCJ40X300-50S Is Used
Machine Tool Changeovers
Fine-tune the 250-300mm extend stroke on-site for different tooling lengths, using the variable cushion to stop heavy 628.3N pushes smoothly.
High-Speed Diverters
Adjust the 50mm stroke window to match varying package sizes on the fly, while the needle cushion absorbs the shock of 800mm/s cycling.
Vertical Lift Gates
Lift loads up to 32kg with a 2:1 safety margin, relying on the -S magnet for position feedback and the compact JIS body to save axial space.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50S the Right Cylinder?
When sizing between the two available bores, the MFCJ40 provides substantial power with 628.3N push and 527.8N pull at 0.5MPa, stepping up from the MFCJ32 at 402.2N. This yields a safe working load around 377N, or roughly 32kg of vertical lift with a 2:1 margin. Choose this 40mm option when moving heavier fixtures that need precise travel tuning.
The 50mm adjustable window is perfect for high-speed changeovers where the exact extend point and end-of-stroke shock both need tweaking. Note that the air cushion only decelerates the piston near stroke end—it is not a lock. The piston will drift on air loss, so install an external rod lock or pilot check valve for held loads. Mounting options include LB foot, FA flange, and TC trunnion (no SDB).
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 MFCJ40X300-50S FAQ
This 40mm bore cylinder uses a 1/4" port and M14x1.5 male rod thread. It generates 628.3N push and 527.8N pull at 0.5MPa, 879.6N push and 738.9N pull at 0.7MPa, with a theoretical maximum of 128.1kgf at 1.0MPa.
An external adjuster shortens the extend stroke by up to 50mm, and needle variable air cushions at both ends decelerate the piston near stroke end for quiet high-speed motion. The cushion is not a brake; the cylinder cannot hold a load on air loss. The -S magnet enables CMSG, DMSG, or EMSG sensors.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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