Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-20
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-20 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 300mm 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
- Stroke300 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 MFCJ20X300-20
Dial in exact end positions on the fly with this double-acting JIS-standard round-body mini cylinder, which lets you shorten the extend stroke by up to 20 mm on site. The 300 mm base stroke yields a usable 280-300 mm extend, while a needle-set variable air cushion at both ends soaks up high-speed shock for smooth deceleration.
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 stroke, saving valuable mounting length. It pushes with 157 N at 0.5 MPa (pulling 131.9 N) through a 1/8" port and an Ø8 mm rod. This yields a safe working load of roughly 94 N, lifting about 8 kg vertically with a 2:1 margin. Note this SKU lacks a magnet, so it cannot take a position sensor.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-20 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-20 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 300 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 MFCJ20X300-20
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | 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 MFCJ20X300-20 Is Used
Gauge Probe Positioning
Fine-tune the 280-300 mm extend distance by the 20 mm window during trial fits, letting the 157 N thrust probe parts accurately without crashing the fixture.
Light Diverter Arm
Tune the extend endpoint on site for varying package widths, relying on the variable air cushion to silently stop the 8 kg diverter at high cycle speeds.
Small Press Fit Jig
Shorten the extend stroke on the fly for delicate insertions, using the needle cushion to absorb end-of-stroke shock on light 94 N assembly loads.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-20 the Right Cylinder?
When sizing this 20 mm bore against the MFCJ25, compare the real thrust: 157 N push here versus 245.3 N at 0.5 MPa for the larger bore. Choose the 20 mm if your changeover only needs light force and tight spatial constraints, stepping up to the 25 mm if moving heavier jigs. The external adjuster and twin air cushions excel in high-speed, shock-sensitive trial fits where you must tune both the stroke endpoint and the deceleration curve.
Mounting options include LB foot, FA flange and TC trunnion (no SDB). Because this specific SKU has no -S magnet, it cannot accept CMSG, DMSG or EMSG switches. Finally, the air cushion only decelerates the piston near stroke end—it is not a lock. If the load must be held on air loss, fit 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 MFCJ20X300-20 FAQ
This 20 mm bore cylinder has a 1/8" port and an Ø8 mm rod. It generates 157 N push and 131.9 N pull at 0.5 MPa, 219.8 N push and 184.7 N pull at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa.
No, this specific SKU lacks the -S magnet option, so it cannot accept CMSG, DMSG or EMSG switches. The external adjuster shortens the extend stroke by up to 20 mm, but it only sets the end position—it is not a mid-stroke lock.
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Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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