Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-40 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 MFCJ40X300-40
Dial in exact end positions on-site with this 40 mm bore adjustable-stroke cylinder, which shortens the 300 mm extend stroke by up to 40 mm via an external adjuster. As a JIS-standard round-body mini, its riveted SUS304 stainless barrel and aluminium covers form a compact body that is physically shorter than an equivalent ISO 6432 unit, saving valuable mounting length while resisting mild washdown corrosion.
Driven by filtered air at 0.15-1.0 MPa through a 1/4" port, the Ø16 rod (M14x1.5 male thread) delivers a robust 628.3 N push force at 0.5 MPa. A needle-set variable air cushion at both ends soaks up high-speed kinetic energy for smooth deceleration. Factoring a 2:1 safety margin, this bore lifts about 32 kg vertically, yielding a safe working load near 377 N. Note this SKU lacks the -S magnet, so it cannot accept CMSG/DMSG/EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-40 |
|---|---|
| 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 MFCJ40X300-40
| 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 MFCJ40X300-40 Is Used
High-Speed Diverters
Tune the 40 mm stroke window and needle air cushion to softly route 30 kg packages at 800 mm/s without harsh end impacts.
Press Feed Trial Fits
Leverage the 628.3 N push force to feed stock, dialing in the exact extend position during changeovers to prevent over-travel.
Pallet Stopper Gates
Adjust the stopping endpoint on-site for various pallet sizes while the air cushion absorbs the shock of heavy incoming loads.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-40 the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need to step up from 402.2 N to 628.3 N of push force at 0.5 MPa. This larger bore is ideal for high-speed changeovers where both the exact extend endpoint and the end-of-stroke shock require field tuning. The variable air cushion only decelerates the piston near the stroke ends; it does not lock or hold the load. If your application must prevent drift on air loss, add an external rod lock or pilot check valve.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code is available on this adjustable build). Because this specific code lacks the -S magnet option, position sensing is not possible; order an -S variant if you require CMSG, DMSG, or EMSG switches.
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 MFCJ40X300-40 FAQ
This 40 mm bore cylinder uses a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 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 the -S magnet, so it cannot accept CMSG, DMSG, or EMSG switches. You must order an -S variant for position sensing. The external adjuster shortens the extend stroke by up to 40 mm, and the variable air cushion decelerates the piston, but neither feature acts as a mid-stroke lock.
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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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