Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-30S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-30S 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 MFCJ40X300-30S
Tune both the extend end-point and end-of-stroke shock on site with this 40 mm bore, 300 mm stroke adjustable cylinder. A built-in magnet (-S) enables CMSG, DMSG or EMSG switches, while the external adjuster shortens the extend stroke by up to 30 mm (usable range 270-300 mm). The SUS304 stainless barrel and riveted aluminium covers form a JIS-standard round body that is shorter than an ISO 6432 cylinder for the same stroke, saving valuable mounting length.
Driven by filtered air through a 1/4" port, it delivers 628.3 N push and 527.8 N pull at 0.5 MPa. The variable air cushion at both ends soaks up high-speed kinetic energy for smooth stops. With a safe working load around 377 N, it lifts about 32 kg vertically with a 2:1 margin. The cushion only decelerates the piston near the ends; it does not hold position on air loss.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-30S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-30S |
|---|---|
| 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 MFCJ40X300-30S
| 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 MFCJ40X300-30S Is Used
High-Speed Diverters
Dial in the 270-300 mm extend stroke and tune the needle air cushion to bring heavy packages to a smooth, quiet halt without shock loads.
Machining Changeovers
Use the 30 mm adjuster window to fine-tune actuator endpoints during tooling swaps, relying on the 628.3 N push force to clear chips.
Vertical Lift Gates
Lift loads up to 32 kg vertically with a 2:1 safety margin, using the -S magnet to confirm gate position at the top end.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-30S the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need the higher 628.3 N push force at 0.5 MPa, rather than the 402.2 N offered by the 32 mm bore. This 40 mm model is ideal for high-speed changeovers where you must dial in a precise 270-300 mm extend stroke and tune the needle air cushion to protect shock-sensitive trial fits. Mount via LB foot, FA flange or TC trunnion (no SDB or back-cover option exists on this build).
The -S magnet allows solid-state or reed sensors for position confirmation. Remember that the air cushion and adjuster only manage motion and end-position; they do not lock the load. If gravity or air loss could cause the piston to drift, install an external rod lock or pilot-operated 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 MFCJ40X300-30S 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, 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.
The external adjuster shortens the extend stroke by up to 30 mm on site (yielding a 270-300 mm usable range), while the variable air cushion at both ends decelerates the piston at high speeds. The -S suffix means it has a built-in magnet for 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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