Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 80mm 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
- Stroke80 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 MFCJ40X80-20
Tune both the extend reach and the end-of-travel shock on site with this 40 mm bore adjustable-stroke cylinder. The external adjuster shortens the 80 mm extend stroke by up to 20 mm, while the needle variable air cushion at both ends soaks up high-speed impact for smooth deceleration. It delivers 628.3 N push force at 0.5 MPa.
Built as a JIS-standard round-body mini with a SUS304 stainless barrel and riveted aluminium covers, the body is shorter than an ISO 6432 cylinder for the same stroke, saving mounting length. It uses a 1/4" port and a 16 mm rod. As a practical buyer insight, the safe working load is about 377 N, meaning it lifts roughly 32 kg vertically with a 2:1 safety margin. Note this SKU lacks the -S magnet, so it cannot take CMSG/DMSG/EMSG sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MFCJ40X80-20
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MFCJ40X80-20 Is Used
High-Speed Diverter
Pushes 32 kg cartons at speed on a packaging line, using the 20 mm stroke adjuster to fine-tune the push distance for different box sizes while the air cushion absorbs the shock.
Press Feed Stop
Acts as an adjustable feed stop in a metal stamping cell, leveraging the 628.3 N push force to halt material and tuning the needle cushion to prevent bounceback.
Pallet Positioning
Indexes heavy pallets into a wrap station, dialing the extend end position on site and relying on the variable cushion to soften the 879.6 N impact force at 0.7 MPa.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20 the Right Cylinder?
Choose between the two available bores based on your force needs: this MFCJ40 provides 628.3 N push at 0.5 MPa, whereas the smaller MFCJ32 offers 402.2 N. Select the 40 mm bore when moving heavier masses at high speed, and use the 20 mm adjustable window to dial in the exact extend position during changeovers without machining spacers. The variable air cushion is ideal for trial fits where end-of-stroke shock needs tuning. Remember the cushion only decelerates the piston; it does not hold the load on air loss. For position holding, add an external rod lock or pilot check valve. Mount via LB foot, FA flange, or 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 MFCJ40X80-20 FAQ
This 40 mm bore cylinder has a 1/4" port and a 16 mm rod. The double-acting thrust is 628.3 N push and 527.8 N pull at 0.5 MPa, or 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 20 mm on site, giving a usable extend of 60-80 mm; retract remains full. The needle air cushion decelerates the piston near the ends but does not lock the load. This specific SKU has no -S magnet, so it cannot accept CMSG, DMSG, or EMSG sensors.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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