Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 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 MFCJ40X40-20
Tune both travel and end-of-stroke shock precisely with this 40 mm bore adjustable-stroke mini cylinder. The external adjuster shortens the extend stroke by up to 20 mm on site, while the needle variable air cushion at both ends soaks up high-speed impact. It delivers 628.3 N push force at 0.5 MPa.
Built as a JIS-standard round-body unit with a SUS304 stainless barrel and riveted aluminium covers, it is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length. The 1/4" port and M14x1.5 male rod thread handle robust flow. Note this SKU lacks a magnet, so it cannot take a sensor; the -S variant enables CMSG/DMSG/EMSG switches.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 MFCJ40X40-20
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MFCJ40X40-20 Is Used
High-Speed Forming Press
Use the 628.3 N thrust to drive a forming pin, dialing in the 20 mm adjuster to prevent bottoming out while the air cushion absorbs rapid deceleration.
Package Divert Arm
Actuate a routing flap at high speed; tune the extend end to match varying box sizes and let the needle cushion silently soak up end shock.
Pallet Stop Gate
Deploy a heavy stop gate using the 32 kg vertical lift margin, adjusting the stroke on site for different pallet heights without changing the cylinder.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X40-20 the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need heavier thrust: the 40 mm bore pushes 628.3 N versus 402.2 N at 0.5 MPa. This yields a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin. The 20 mm adjustable window is ideal for trial fits where the exact extend position and end shock both need tuning.
Mount using LB foot, FA flange, or TC trunnion (no SDB). The air cushion only decelerates near the stroke end—it is not a lock. For position holding on 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 MFCJ40X40-20 FAQ
This 40 mm bore cylinder features a 1/4" port and M14x1.5 male rod 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 max of 128.1 kgf at 1.0 MPa.
This specific SKU has no magnet, so it cannot accept CMSG/DMSG/EMSG switches; you need the -S variant for sensing. The external adjuster only shortens the extend end position—it is not a mid-stroke lock, and the air cushion only decelerates near the ends.
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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.
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Most inquiries answered within 7-8 hours.
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