Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20S 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 MFCJ40X80-20S
Trimming the extend stroke by up to 20 mm on-site is effortless with this double-acting mini cylinder, letting you dial in an exact 60-80 mm end position while the needle variable air cushion soaks up high-speed shocks. As a JIS-standard round-body unit, its riveted SUS304 stainless barrel and aluminium covers form a body noticeably shorter than an ISO 6432 cylinder of the same 40 mm bore and 80 mm stroke, saving valuable machine space.
Delivering a robust 628.3 N push force at 0.5 MPa (and 879.6 N at 0.7 MPa), this bore class yields a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin. The -S suffix equips the piston with a magnet for CMSG, DMSG or EMSG switches, and the 1/4" port handles the 30-800 mm/s speed range smoothly.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20S |
|---|---|
| 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 MFCJ40X80-20S
| 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 MFCJ40X80-20S Is Used
High-Speed Component Pressing
Dial in the exact 60-80 mm extend position for pressing small bearings, using the variable air cushion to absorb the 879.6 N end-of-stroke impact at high speed.
Adjustable Diverter Gate
Trim the extend stroke by 20 mm on-site to clear various package sizes, relying on the 628.3 N push force to redirect heavy cartons smoothly.
Pallet Changeover Stopper
Fine-tune the stopping height for different pallets; the SUS304 stainless body withstands washdown while the needle cushion prevents harsh impacts.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-20S the Right Cylinder?
When sizing these adjustable-stroke units, compare the real thrust: this MFCJ40 provides 628.3 N push at 0.5 MPa, whereas the smaller MFCJ32 delivers 402.2 N. Choose the 40 mm bore if your changeover fixtures or trial fits demand that extra push capacity alongside the 20 mm extend-trim window and needle cushioning for shock-sensitive high-speed moves. Both bores use a 1/4" port and a Ø16 rod with an M14x1.5 male thread.
Mounting options include LB foot, FA flange, and TC trunnion (there is no SDB or back-cover option on this adjustable build). Remember that the air cushion only decelerates the piston near the end of travel—it is not a brake. If gravity or air loss could cause the load to drift, you must fit 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 MFCJ40X80-20S FAQ
This 40 mm bore cylinder features 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, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 20 mm (usable range 60-80 mm), while the needle variable air cushion decelerates the piston at both ends. The -S magnet enables CMSG/DMSG/EMSG sensors. The cushion is not a brake; for load holding on air loss, use an external rod lock or pilot check valve.
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