Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 80mm stroke, 1/8" 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.
- BoreØ20 mm
- Stroke80 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- 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 MFCJ20X80-40
Trim the extend stroke by up to 40 mm on site with this double-acting, variable-cushion, JIS-standard round-body mini cylinder. The external adjuster lets you set the exact end position between 40 and 80 mm, while the needle air cushion at both ends soaks up high-speed shock for smooth, quiet motion.
Built with a SUS304 stainless barrel and riveted aluminium covers, the body is deliberately shorter than an ISO 6432 cylinder for the same 20 mm bore and 80 mm stroke, saving valuable mounting length. Delivering 157 N of push force at 0.5 MPa through a 1/8" port, it provides a safe working load of about 94 N and lifts roughly 8 kg vertically with a 2:1 margin. Note this SKU lacks a magnet, so it cannot take position sensors.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 80 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MFCJ20X80-40
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | 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 MFCJ20X80-40 Is Used
Light-Part Trial Fits
Dial in the exact 40-80 mm extend position during prototype changeovers, relying on the variable air cushion to protect delicate 8 kg assemblies from end-of-stroke impact.
High-Speed Diverters
Sort small goods at speed using the 157 N push force, fine-tuning the extend length on-site to accommodate varying package sizes without swapping cylinders.
Lab Automation Jigs
Fit compact stainless-steel actuators into tight testing cells where the shorter-than-ISO-6432 body length saves space, using the needle cushion for quiet, repeatable motion.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X80-40 the Right Cylinder?
When sizing this 20 mm bore against the MFCJ25, compare the actual thrust: this model pushes 157 N at 0.5 MPa, while the MFCJ25 delivers 245.3 N. Choose the 20 mm bore for lighter, high-speed changeovers where space is tight, and step up to the 25 mm bore if your payload exceeds the 94 N safe working load. Both options feature the on-site stroke adjuster and variable air cushion to dial in end-of-stroke shock.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover mount is available on this adjustable build). Because this specific SKU has no internal magnet, it cannot accept CMSG, DMSG, or EMSG switches; add the -S variant if you require position sensing. Finally, remember the air cushion only decelerates the piston near stroke end—it is not a lock. If your application must hold a load on air loss, 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 MFCJ20X80-40 FAQ
This 20 mm bore cylinder features a 1/8" port and an 8 mm rod. It generates 157 N push and 131.9 N pull at 0.5 MPa, or 219.8 N push and 184.7 N pull at 0.7 MPa. The theoretical maximum force is 32 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 40 mm (usable range 40-80 mm), while the needle variable air cushion decelerates the piston at both ends for smooth high-speed operation. This SKU has no magnet (-S required for sensors). The cushion is not a brake; for load holding on air loss, use an external rod lock or pilot check valve.
Authorized Export Seller
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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